feat: add publish pipeline with HTML/PDF/thumbnail generation

Publisher pipeline (POST /api/publish):
- Server-side TipTap extensions mirroring frontend (no React)
- generateHTML() produces article HTML with SEO meta tags
- Playwright-based PDF and OG thumbnail generation (optional)
- Upload published artifacts to HF dataset (or local fallback)
- HTML template with light/dark theme toggle, image lightbox

Routing updates:
- Authenticated editors get SPA, visitors get published HTML
- Image proxy for private HF datasets (/api/images/*)
- Serve local published articles from /published/

Also: add type declarations for citation-js and playwright
Made-with: Cursor

backend/package-lock.json

@@ -18,10 +18,23 @@
         "@hocuspocus/server": "^3.4.4",
         "@huggingface/hub": "^2.11.0",
         "@openrouter/ai-sdk-provider": "^2.5.1",
+        "@tiptap/core": "^3.22.3",
+        "@tiptap/extension-code-block-lowlight": "^3.22.3",
+        "@tiptap/extension-image": "^3.22.3",
+        "@tiptap/extension-link": "^3.22.3",
+        "@tiptap/extension-mathematics": "^3.22.3",
+        "@tiptap/extension-table": "^3.22.3",
+        "@tiptap/extension-table-cell": "^3.22.3",
+        "@tiptap/extension-table-header": "^3.22.3",
+        "@tiptap/extension-table-row": "^3.22.3",
+        "@tiptap/html": "^3.22.3",
+        "@tiptap/pm": "^3.22.3",
+        "@tiptap/starter-kit": "^3.22.3",
         "ai": "^6.0.158",
         "dotenv": "^17.4.1",
         "express": "^4.21.0",
         "express-ws": "^5.0.2",
+        "lowlight": "^3.3.0",
         "multer": "^2.1.1",
         "yjs": "^13.6.0",
         "zod": "^4.3.6"
@@ -722,12 +735,510 @@
         "node": ">=8.0.0"
       }
     },
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+      "resolved": "https://registry.npmjs.org/@remirror/core-constants/-/core-constants-3.0.0.tgz",
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+      "license": "MIT"
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     "node_modules/@standard-schema/spec": {
       "version": "1.1.0",
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       "license": "MIT"
     },
+    "node_modules/@tiptap/core": {
+      "version": "3.22.3",
+      "resolved": "https://registry.npmjs.org/@tiptap/core/-/core-3.22.3.tgz",
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+      "peer": true,
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/ueberdosis"
+      },
+      "peerDependencies": {
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+    },
+    "node_modules/@tiptap/extension-blockquote": {
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+      "resolved": "https://registry.npmjs.org/@tiptap/extension-blockquote/-/extension-blockquote-3.22.3.tgz",
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+        "url": "https://github.com/sponsors/ueberdosis"
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+      "funding": {
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+        "highlight.js": "^11",
+        "lowlight": "^2 || ^3"
+      }
+    },
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+      "funding": {
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+      },
+      "peerDependencies": {
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+    },
+    "node_modules/@tiptap/extension-dropcursor": {
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+      "resolved": "https://registry.npmjs.org/@tiptap/extension-dropcursor/-/extension-dropcursor-3.22.3.tgz",
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     "node_modules/math-intrinsics": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/math-intrinsics/-/math-intrinsics-1.1.0.tgz",
@@ -1671,6 +2395,12 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/mdurl": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/mdurl/-/mdurl-2.0.0.tgz",
+      "integrity": "sha512-Lf+9+2r+Tdp5wXDXC4PcIBjTDtq4UKjCPMQhKIuzpJNW0b96kVqSwW0bT7FhRSfmAiFYgP+SCRvdrDozfh0U5w==",
+      "license": "MIT"
+    },
     "node_modules/media-typer": {
       "version": "0.3.0",
       "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
@@ -1815,6 +2545,12 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/orderedmap": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/orderedmap/-/orderedmap-2.1.1.tgz",
+      "integrity": "sha512-TvAWxi0nDe1j/rtMcWcIj94+Ffe6n7zhow33h40SKxmsmozs6dz/e+EajymfoFcHd7sxNn8yHM8839uixMOV6g==",
+      "license": "MIT"
+    },
     "node_modules/parseurl": {
       "version": "1.3.3",
       "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.3.tgz",
@@ -1830,6 +2566,204 @@
       "integrity": "sha512-A/AGNMFN3c8bOlvV9RreMdrv7jsmF9XIfDeCd87+I8RNg6s78BhJxMu69NEMHBSJFxKidViTEdruRwEk/WIKqA==",
       "license": "MIT"
     },
+    "node_modules/prosemirror-changeset": {
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/prosemirror-changeset/-/prosemirror-changeset-2.4.0.tgz",
+      "integrity": "sha512-LvqH2v7Q2SF6yxatuPP2e8vSUKS/L+xAU7dPDC4RMyHMhZoGDfBC74mYuyYF4gLqOEG758wajtyhNnsTkuhvng==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-transform": "^1.0.0"
+      }
+    },
+    "node_modules/prosemirror-collab": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/prosemirror-collab/-/prosemirror-collab-1.3.1.tgz",
+      "integrity": "sha512-4SnynYR9TTYaQVXd/ieUvsVV4PDMBzrq2xPUWutHivDuOshZXqQ5rGbZM84HEaXKbLdItse7weMGOUdDVcLKEQ==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-state": "^1.0.0"
+      }
+    },
+    "node_modules/prosemirror-commands": {
+      "version": "1.7.1",
+      "resolved": "https://registry.npmjs.org/prosemirror-commands/-/prosemirror-commands-1.7.1.tgz",
+      "integrity": "sha512-rT7qZnQtx5c0/y/KlYaGvtG411S97UaL6gdp6RIZ23DLHanMYLyfGBV5DtSnZdthQql7W+lEVbpSfwtO8T+L2w==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-model": "^1.0.0",
+        "prosemirror-state": "^1.0.0",
+        "prosemirror-transform": "^1.10.2"
+      }
+    },
+    "node_modules/prosemirror-dropcursor": {
+      "version": "1.8.2",
+      "resolved": "https://registry.npmjs.org/prosemirror-dropcursor/-/prosemirror-dropcursor-1.8.2.tgz",
+      "integrity": "sha512-CCk6Gyx9+Tt2sbYk5NK0nB1ukHi2ryaRgadV/LvyNuO3ena1payM2z6Cg0vO1ebK8cxbzo41ku2DE5Axj1Zuiw==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-state": "^1.0.0",
+        "prosemirror-transform": "^1.1.0",
+        "prosemirror-view": "^1.1.0"
+      }
+    },
+    "node_modules/prosemirror-gapcursor": {
+      "version": "1.4.1",
+      "resolved": "https://registry.npmjs.org/prosemirror-gapcursor/-/prosemirror-gapcursor-1.4.1.tgz",
+      "integrity": "sha512-pMdYaEnjNMSwl11yjEGtgTmLkR08m/Vl+Jj443167p9eB3HVQKhYCc4gmHVDsLPODfZfjr/MmirsdyZziXbQKw==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-keymap": "^1.0.0",
+        "prosemirror-model": "^1.0.0",
+        "prosemirror-state": "^1.0.0",
+        "prosemirror-view": "^1.0.0"
+      }
+    },
+    "node_modules/prosemirror-history": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/prosemirror-history/-/prosemirror-history-1.5.0.tgz",
+      "integrity": "sha512-zlzTiH01eKA55UAf1MEjtssJeHnGxO0j4K4Dpx+gnmX9n+SHNlDqI2oO1Kv1iPN5B1dm5fsljCfqKF9nFL6HRg==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-state": "^1.2.2",
+        "prosemirror-transform": "^1.0.0",
+        "prosemirror-view": "^1.31.0",
+        "rope-sequence": "^1.3.0"
+      }
+    },
+    "node_modules/prosemirror-inputrules": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/prosemirror-inputrules/-/prosemirror-inputrules-1.5.1.tgz",
+      "integrity": "sha512-7wj4uMjKaXWAQ1CDgxNzNtR9AlsuwzHfdFH1ygEHA2KHF2DOEaXl1CJfNPAKCg9qNEh4rum975QLaCiQPyY6Fw==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-state": "^1.0.0",
+        "prosemirror-transform": "^1.0.0"
+      }
+    },
+    "node_modules/prosemirror-keymap": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/prosemirror-keymap/-/prosemirror-keymap-1.2.3.tgz",
+      "integrity": "sha512-4HucRlpiLd1IPQQXNqeo81BGtkY8Ai5smHhKW9jjPKRc2wQIxksg7Hl1tTI2IfT2B/LgX6bfYvXxEpJl7aKYKw==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-state": "^1.0.0",
+        "w3c-keyname": "^2.2.0"
+      }
+    },
+    "node_modules/prosemirror-markdown": {
+      "version": "1.13.4",
+      "resolved": "https://registry.npmjs.org/prosemirror-markdown/-/prosemirror-markdown-1.13.4.tgz",
+      "integrity": "sha512-D98dm4cQ3Hs6EmjK500TdAOew4Z03EV71ajEFiWra3Upr7diytJsjF4mPV2dW+eK5uNectiRj0xFxYI9NLXDbw==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/markdown-it": "^14.0.0",
+        "markdown-it": "^14.0.0",
+        "prosemirror-model": "^1.25.0"
+      }
+    },
+    "node_modules/prosemirror-menu": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/prosemirror-menu/-/prosemirror-menu-1.3.0.tgz",
+      "integrity": "sha512-TImyPXCHPcDsSka2/lwJ6WjTASr4re/qWq1yoTTuLOqfXucwF6VcRa2LWCkM/EyTD1UO3CUwiH8qURJoWJRxwg==",
+      "license": "MIT",
+      "dependencies": {
+        "crelt": "^1.0.0",
+        "prosemirror-commands": "^1.0.0",
+        "prosemirror-history": "^1.0.0",
+        "prosemirror-state": "^1.0.0"
+      }
+    },
+    "node_modules/prosemirror-model": {
+      "version": "1.25.4",
+      "resolved": "https://registry.npmjs.org/prosemirror-model/-/prosemirror-model-1.25.4.tgz",
+      "integrity": "sha512-PIM7E43PBxKce8OQeezAs9j4TP+5yDpZVbuurd1h5phUxEKIu+G2a+EUZzIC5nS1mJktDJWzbqS23n1tsAf5QA==",
+      "license": "MIT",
+      "peer": true,
+      "dependencies": {
+        "orderedmap": "^2.0.0"
+      }
+    },
+    "node_modules/prosemirror-schema-basic": {
+      "version": "1.2.4",
+      "resolved": "https://registry.npmjs.org/prosemirror-schema-basic/-/prosemirror-schema-basic-1.2.4.tgz",
+      "integrity": "sha512-ELxP4TlX3yr2v5rM7Sb70SqStq5NvI15c0j9j/gjsrO5vaw+fnnpovCLEGIcpeGfifkuqJwl4fon6b+KdrODYQ==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-model": "^1.25.0"
+      }
+    },
+    "node_modules/prosemirror-schema-list": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/prosemirror-schema-list/-/prosemirror-schema-list-1.5.1.tgz",
+      "integrity": "sha512-927lFx/uwyQaGwJxLWCZRkjXG0p48KpMj6ueoYiu4JX05GGuGcgzAy62dfiV8eFZftgyBUvLx76RsMe20fJl+Q==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-model": "^1.0.0",
+        "prosemirror-state": "^1.0.0",
+        "prosemirror-transform": "^1.7.3"
+      }
+    },
+    "node_modules/prosemirror-state": {
+      "version": "1.4.4",
+      "resolved": "https://registry.npmjs.org/prosemirror-state/-/prosemirror-state-1.4.4.tgz",
+      "integrity": "sha512-6jiYHH2CIGbCfnxdHbXZ12gySFY/fz/ulZE333G6bPqIZ4F+TXo9ifiR86nAHpWnfoNjOb3o5ESi7J8Uz1jXHw==",
+      "license": "MIT",
+      "peer": true,
+      "dependencies": {
+        "prosemirror-model": "^1.0.0",
+        "prosemirror-transform": "^1.0.0",
+        "prosemirror-view": "^1.27.0"
+      }
+    },
+    "node_modules/prosemirror-tables": {
+      "version": "1.8.5",
+      "resolved": "https://registry.npmjs.org/prosemirror-tables/-/prosemirror-tables-1.8.5.tgz",
+      "integrity": "sha512-V/0cDCsHKHe/tfWkeCmthNUcEp1IVO3p6vwN8XtwE9PZQLAZJigbw3QoraAdfJPir4NKJtNvOB8oYGKRl+t0Dw==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-keymap": "^1.2.3",
+        "prosemirror-model": "^1.25.4",
+        "prosemirror-state": "^1.4.4",
+        "prosemirror-transform": "^1.10.5",
+        "prosemirror-view": "^1.41.4"
+      }
+    },
+    "node_modules/prosemirror-trailing-node": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/prosemirror-trailing-node/-/prosemirror-trailing-node-3.0.0.tgz",
+      "integrity": "sha512-xiun5/3q0w5eRnGYfNlW1uU9W6x5MoFKWwq/0TIRgt09lv7Hcser2QYV8t4muXbEr+Fwo0geYn79Xs4GKywrRQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@remirror/core-constants": "3.0.0",
+        "escape-string-regexp": "^4.0.0"
+      },
+      "peerDependencies": {
+        "prosemirror-model": "^1.22.1",
+        "prosemirror-state": "^1.4.2",
+        "prosemirror-view": "^1.33.8"
+      }
+    },
+    "node_modules/prosemirror-transform": {
+      "version": "1.12.0",
+      "resolved": "https://registry.npmjs.org/prosemirror-transform/-/prosemirror-transform-1.12.0.tgz",
+      "integrity": "sha512-GxboyN4AMIsoHNtz5uf2r2Ru551i5hWeCMD6E2Ib4Eogqoub0NflniaBPVQ4MrGE5yZ8JV9tUHg9qcZTTrcN4w==",
+      "license": "MIT",
+      "dependencies": {
+        "prosemirror-model": "^1.21.0"
+      }
+    },
+    "node_modules/prosemirror-view": {
+      "version": "1.41.8",
+      "resolved": "https://registry.npmjs.org/prosemirror-view/-/prosemirror-view-1.41.8.tgz",
+      "integrity": "sha512-TnKDdohEatgyZNGCDWIdccOHXhYloJwbwU+phw/a23KBvJIR9lWQWW7WHHK3vBdOLDNuF7TaX98GObUZOWkOnA==",
+      "license": "MIT",
+      "peer": true,
+      "dependencies": {
+        "prosemirror-model": "^1.20.0",
+        "prosemirror-state": "^1.0.0",
+        "prosemirror-transform": "^1.1.0"
+      }
+    },
     "node_modules/proxy-addr": {
       "version": "2.0.7",
       "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.7.tgz",
@@ -1843,6 +2777,15 @@
         "node": ">= 0.10"
       }
     },
+    "node_modules/punycode.js": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/punycode.js/-/punycode.js-2.3.1.tgz",
+      "integrity": "sha512-uxFIHU0YlHYhDQtV4R9J6a52SLx28BCjT+4ieh7IGbgwVJWO+km431c4yRlREUAsAmt/uMjQUyQHNEPf0M39CA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/qs": {
       "version": "6.14.2",
       "resolved": "https://registry.npmjs.org/qs/-/qs-6.14.2.tgz",
@@ -1906,6 +2849,12 @@
         "url": "https://github.com/privatenumber/resolve-pkg-maps?sponsor=1"
       }
     },
+    "node_modules/rope-sequence": {
+      "version": "1.3.4",
+      "resolved": "https://registry.npmjs.org/rope-sequence/-/rope-sequence-1.3.4.tgz",
+      "integrity": "sha512-UT5EDe2cu2E/6O4igUr5PSFs23nvvukicWHx6GnOPlHAiiYbzNuCRQCuiUdHJQcqKalLKlrYJnjY0ySGsXNQXQ==",
+      "license": "MIT"
+    },
     "node_modules/safe-buffer": {
       "version": "5.2.1",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
@@ -2196,11 +3145,16 @@
         "node": ">=14.17"
       }
     },
+    "node_modules/uc.micro": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/uc.micro/-/uc.micro-2.1.0.tgz",
+      "integrity": "sha512-ARDJmphmdvUk6Glw7y9DQ2bFkKBHwQHLi2lsaH6PPmz/Ka9sFOBsBluozhDltWmnv9u/cF6Rt87znRTPV+yp/A==",
+      "license": "MIT"
+    },
     "node_modules/undici-types": {
       "version": "6.21.0",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.21.0.tgz",
       "integrity": "sha512-iwDZqg0QAGrg9Rav5H4n0M64c3mkR59cJ6wQp+7C4nI0gsmExaedaYLNO44eT4AtBBwjbTiGPMlt2Md0T9H9JQ==",
-      "dev": true,
       "license": "MIT"
     },
     "node_modules/unpipe": {
@@ -2236,12 +3190,27 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/w3c-keyname": {
+      "version": "2.2.8",
+      "resolved": "https://registry.npmjs.org/w3c-keyname/-/w3c-keyname-2.2.8.tgz",
+      "integrity": "sha512-dpojBhNsCNN7T82Tm7k26A6G9ML3NkhDsnw9n/eoxSRlVBB4CEtIQ/KTCLI2Fwf3ataSXRhYFkQi3SlnFwPvPQ==",
+      "license": "MIT"
+    },
     "node_modules/webidl-conversions": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
       "integrity": "sha512-2JAn3z8AR6rjK8Sm8orRC0h/bcl/DqL7tRPdGZ4I1CjdF+EaMLmYxBHyXuKL849eucPFhvBoxMsflfOb8kxaeQ==",
       "license": "BSD-2-Clause"
     },
+    "node_modules/whatwg-mimetype": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-3.0.0.tgz",
+      "integrity": "sha512-nt+N2dzIutVRxARx1nghPKGv1xHikU7HKdfafKkLNLindmPU/ch3U31NOCGGA/dmPcmb1VlofO0vnKAcsm0o/Q==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      }
+    },
     "node_modules/whatwg-url": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",

backend/package.json

@@ -19,10 +19,23 @@
     "@hocuspocus/server": "^3.4.4",
     "@huggingface/hub": "^2.11.0",
     "@openrouter/ai-sdk-provider": "^2.5.1",
+    "@tiptap/core": "^3.22.3",
+    "@tiptap/extension-code-block-lowlight": "^3.22.3",
+    "@tiptap/extension-image": "^3.22.3",
+    "@tiptap/extension-link": "^3.22.3",
+    "@tiptap/extension-mathematics": "^3.22.3",
+    "@tiptap/extension-table": "^3.22.3",
+    "@tiptap/extension-table-cell": "^3.22.3",
+    "@tiptap/extension-table-header": "^3.22.3",
+    "@tiptap/extension-table-row": "^3.22.3",
+    "@tiptap/html": "^3.22.3",
+    "@tiptap/pm": "^3.22.3",
+    "@tiptap/starter-kit": "^3.22.3",
     "ai": "^6.0.158",
     "dotenv": "^17.4.1",
     "express": "^4.21.0",
     "express-ws": "^5.0.2",
+    "lowlight": "^3.3.0",
     "multer": "^2.1.1",
     "yjs": "^13.6.0",
     "zod": "^4.3.6"

backend/src/hf-storage.ts

@@ -95,3 +95,67 @@ export async function flushAll(): Promise<void> {
   const names = [...dirtyDocs.keys()];
   await Promise.allSettled(names.map((n) => pushDocument(n)));
 }
+
+// ---------- Published Assets ----------
+
+interface PublishedPayload {
+  html: string;
+  pdf: Buffer | null;
+  thumbnail: Buffer | null;
+  meta: { title: string; description: string; authors: string[]; date: string; [key: string]: unknown };
+}
+
+export async function uploadPublishedAssets(
+  docName: string,
+  payload: PublishedPayload
+): Promise<{ htmlUrl: string; pdfUrl: string | null; thumbUrl: string | null }> {
+  const safeName = sanitizeName(docName);
+  const base = `published/${safeName}`;
+
+  // Upload HTML
+  await uploadFile({
+    repo,
+    file: { path: `${base}/index.html`, content: new Blob([payload.html]) },
+    accessToken: HF_TOKEN,
+    commitTitle: `publish ${safeName}: HTML`,
+  });
+
+  const baseUrl = `https://huggingface.co/datasets/${HF_DATASET_ID}/resolve/main/${base}`;
+  let pdfUrl: string | null = null;
+  let thumbUrl: string | null = null;
+
+  // Upload PDF
+  if (payload.pdf) {
+    await uploadFile({
+      repo,
+      file: { path: `${base}/article.pdf`, content: new Blob([new Uint8Array(payload.pdf)]) },
+      accessToken: HF_TOKEN,
+      commitTitle: `publish ${safeName}: PDF`,
+    });
+    pdfUrl = `${baseUrl}/article.pdf`;
+  }
+
+  // Upload thumbnail
+  if (payload.thumbnail) {
+    await uploadFile({
+      repo,
+      file: { path: `${base}/thumb.jpg`, content: new Blob([new Uint8Array(payload.thumbnail)]) },
+      accessToken: HF_TOKEN,
+      commitTitle: `publish ${safeName}: thumbnail`,
+    });
+    thumbUrl = `${baseUrl}/thumb.jpg`;
+  }
+
+  // Upload meta.json
+  await uploadFile({
+    repo,
+    file: {
+      path: `${base}/meta.json`,
+      content: new Blob([JSON.stringify(payload.meta, null, 2)]),
+    },
+    accessToken: HF_TOKEN,
+    commitTitle: `publish ${safeName}: metadata`,
+  });
+
+  return { htmlUrl: `${baseUrl}/index.html`, pdfUrl, thumbUrl };
+}

backend/src/publisher/extensions.ts

@@ -0,0 +1,307 @@
+/**
+ * Server-side TipTap extensions for generateHTML().
+ *
+ * Mirrors the frontend extension list but without:
+ * - React NodeViews (not available server-side)
+ * - Collaboration / CollaborationCursor / CollaborationUndo
+ * - Placeholder, SlashCommands, ImageUpload, Comment (editor-only)
+ */
+
+import { Node, mergeAttributes, type Extensions } from "@tiptap/core";
+import StarterKit from "@tiptap/starter-kit";
+import CodeBlockLowlight from "@tiptap/extension-code-block-lowlight";
+import Link from "@tiptap/extension-link";
+import Mathematics from "@tiptap/extension-mathematics";
+import Image from "@tiptap/extension-image";
+import { Table } from "@tiptap/extension-table";
+import { TableRow } from "@tiptap/extension-table-row";
+import { TableCell } from "@tiptap/extension-table-cell";
+import { TableHeader } from "@tiptap/extension-table-header";
+import { common, createLowlight } from "lowlight";
+
+const lowlight = createLowlight(common);
+
+// ---- Custom inline nodes (server versions, no NodeView) ----
+
+const CitationServer = Node.create({
+  name: "citation",
+  group: "inline",
+  inline: true,
+  atom: true,
+  addAttributes() {
+    return { key: { default: "" } };
+  },
+  parseHTML() {
+    return [{ tag: 'span[data-type="citation"]' }];
+  },
+  renderHTML({ HTMLAttributes }) {
+    return [
+      "span",
+      mergeAttributes(HTMLAttributes, {
+        "data-type": "citation",
+        class: "citation-node",
+      }),
+    ];
+  },
+});
+
+const BibliographyServer = Node.create({
+  name: "bibliography",
+  group: "block",
+  atom: true,
+  parseHTML() {
+    return [{ tag: 'div[data-type="bibliography"]' }];
+  },
+  renderHTML({ HTMLAttributes }) {
+    return [
+      "div",
+      mergeAttributes(HTMLAttributes, {
+        "data-type": "bibliography",
+        class: "bibliography-block",
+      }),
+    ];
+  },
+});
+
+const GlossaryServer = Node.create({
+  name: "glossary",
+  group: "inline",
+  inline: true,
+  atom: true,
+  addAttributes() {
+    return {
+      term: { default: "" },
+      definition: { default: "" },
+    };
+  },
+  parseHTML() {
+    return [{ tag: 'span[data-type="glossary"]' }];
+  },
+  renderHTML({ HTMLAttributes, node }) {
+    return [
+      "span",
+      mergeAttributes(HTMLAttributes, {
+        "data-type": "glossary",
+        class: "glossary-node",
+        title: node.attrs.definition,
+        tabindex: "0",
+      }),
+      node.attrs.term || "",
+    ];
+  },
+});
+
+const FootnoteServer = Node.create({
+  name: "footnote",
+  group: "inline",
+  inline: true,
+  atom: true,
+  addAttributes() {
+    return { content: { default: "" } };
+  },
+  parseHTML() {
+    return [{ tag: 'span[data-type="footnote"]' }];
+  },
+  renderHTML({ HTMLAttributes }) {
+    return [
+      "span",
+      mergeAttributes(HTMLAttributes, {
+        "data-type": "footnote",
+        class: "footnote-node",
+      }),
+    ];
+  },
+});
+
+// ---- Stack ----
+
+const StackColumnServer = Node.create({
+  name: "stackColumn",
+  group: "stackColumn",
+  content: "block+",
+  defining: true,
+  isolating: true,
+  parseHTML() {
+    return [{ tag: 'div[data-type="stack-column"]' }];
+  },
+  renderHTML({ HTMLAttributes }) {
+    return [
+      "div",
+      mergeAttributes(HTMLAttributes, { "data-type": "stack-column" }),
+      0,
+    ];
+  },
+});
+
+const StackServer = Node.create({
+  name: "stack",
+  group: "block",
+  content: "stackColumn{2,4}",
+  defining: true,
+  isolating: true,
+  addAttributes() {
+    return {
+      layout: { default: "2-column" },
+      gap: { default: "medium" },
+    };
+  },
+  parseHTML() {
+    return [{ tag: 'div[data-component="stack"]' }];
+  },
+  renderHTML({ HTMLAttributes }) {
+    return [
+      "div",
+      mergeAttributes(HTMLAttributes, { "data-component": "stack" }),
+      0,
+    ];
+  },
+});
+
+// ---- Generic wrapper/atomic components from the registry ----
+
+interface ComponentDefLite {
+  name: string;
+  kind: "wrapper" | "atomic";
+  fields: { name: string; type: string; default?: unknown }[];
+  content?: string;
+}
+
+const COMPONENT_DEFS: ComponentDefLite[] = [
+  {
+    name: "accordion",
+    kind: "wrapper",
+    fields: [
+      { name: "title", type: "string", default: "Details" },
+      { name: "open", type: "boolean", default: false },
+    ],
+  },
+  {
+    name: "note",
+    kind: "wrapper",
+    fields: [
+      { name: "title", type: "string", default: "" },
+      { name: "emoji", type: "string", default: "" },
+      { name: "variant", type: "select", default: "neutral" },
+    ],
+  },
+  {
+    name: "quoteBlock",
+    kind: "wrapper",
+    fields: [
+      { name: "author", type: "string", default: "" },
+      { name: "source", type: "string", default: "" },
+    ],
+  },
+  { name: "wide", kind: "wrapper", fields: [] },
+  { name: "fullWidth", kind: "wrapper", fields: [] },
+  { name: "sidenote", kind: "wrapper", fields: [] },
+  {
+    name: "reference",
+    kind: "wrapper",
+    fields: [
+      { name: "id", type: "string", default: "" },
+      { name: "caption", type: "string", default: "" },
+    ],
+  },
+  {
+    name: "htmlEmbed",
+    kind: "atomic",
+    fields: [
+      { name: "src", type: "string", default: "" },
+      { name: "title", type: "string", default: "" },
+      { name: "desc", type: "string", default: "" },
+      { name: "wide", type: "boolean", default: false },
+      { name: "downloadable", type: "boolean", default: false },
+    ],
+  },
+  {
+    name: "hfUser",
+    kind: "atomic",
+    fields: [
+      { name: "username", type: "string", default: "" },
+      { name: "name", type: "string", default: "" },
+      { name: "url", type: "string", default: "" },
+    ],
+  },
+  {
+    name: "rawHtml",
+    kind: "atomic",
+    fields: [
+      { name: "html", type: "string", default: "" },
+    ],
+  },
+];
+
+function makeServerWrapperExt(def: ComponentDefLite) {
+  return Node.create({
+    name: def.name,
+    group: "block",
+    content: def.content || "block+",
+    defining: true,
+    isolating: true,
+    addAttributes() {
+      const attrs: Record<string, { default: unknown }> = {};
+      for (const f of def.fields) attrs[f.name] = { default: f.default ?? null };
+      return attrs;
+    },
+    parseHTML() {
+      return [{ tag: `div[data-component="${def.name}"]` }];
+    },
+    renderHTML({ HTMLAttributes }) {
+      return [
+        "div",
+        mergeAttributes(HTMLAttributes, { "data-component": def.name }),
+        0,
+      ];
+    },
+  });
+}
+
+function makeServerAtomicExt(def: ComponentDefLite) {
+  return Node.create({
+    name: def.name,
+    group: "block",
+    atom: true,
+    addAttributes() {
+      const attrs: Record<string, { default: unknown }> = {};
+      for (const f of def.fields) attrs[f.name] = { default: f.default ?? null };
+      return attrs;
+    },
+    parseHTML() {
+      return [{ tag: `div[data-component="${def.name}"]` }];
+    },
+    renderHTML({ HTMLAttributes }) {
+      return [
+        "div",
+        mergeAttributes(HTMLAttributes, { "data-component": def.name }),
+      ];
+    },
+  });
+}
+
+export function getServerExtensions(): Extensions {
+  const wrappers = COMPONENT_DEFS.filter((d) => d.kind === "wrapper").map(makeServerWrapperExt);
+  const atomics = COMPONENT_DEFS.filter((d) => d.kind === "atomic").map(makeServerAtomicExt);
+
+  return [
+    StarterKit.configure({
+      codeBlock: false,
+    } as any),
+    CodeBlockLowlight.configure({ lowlight }),
+    Link.configure({ openOnClick: false }),
+    Mathematics.configure({ katexOptions: { throwOnError: false } }),
+    Image.configure({ allowBase64: true }),
+    Table.configure({ resizable: false }),
+    TableRow,
+    TableCell,
+    TableHeader,
+    CitationServer,
+    BibliographyServer,
+    GlossaryServer,
+    FootnoteServer,
+    StackServer,
+    StackColumnServer,
+    ...wrappers,
+    ...atomics,
+  ];
+}

backend/src/publisher/html-renderer.ts

@@ -0,0 +1,291 @@
+/**
+ * Server-side HTML renderer.
+ *
+ * Takes TipTap JSON content and generates a full static HTML page
+ * with SEO tags, dark/light theming, and minimal inline JS.
+ */
+
+import { generateHTML } from "@tiptap/html";
+import { getServerExtensions } from "./extensions.js";
+
+export interface PublishMeta {
+  title: string;
+  description: string;
+  authors: string[];
+  date: string;
+  ogImage?: string;
+}
+
+/**
+ * Render TipTap JSON document into a complete, self-contained HTML page.
+ */
+export function renderArticleHTML(
+  json: Record<string, unknown>,
+  meta: PublishMeta,
+  cssTokens: string,
+  cssArticle: string
+): string {
+  const extensions = getServerExtensions();
+  const bodyHtml = generateHTML(json as any, extensions);
+  const enrichedBody = postProcess(bodyHtml);
+
+  const authorsStr = meta.authors.join(", ");
+  const safeTitle = escapeHtml(meta.title);
+  const safeDesc = escapeHtml(meta.description);
+
+  return `<!DOCTYPE html>
+<html lang="en" data-theme="dark">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>${safeTitle}</title>
+  <meta name="description" content="${safeDesc}">
+  <meta name="author" content="${escapeHtml(authorsStr)}">
+
+  <!-- Open Graph -->
+  <meta property="og:type" content="article">
+  <meta property="og:title" content="${safeTitle}">
+  <meta property="og:description" content="${safeDesc}">
+  ${meta.ogImage ? `<meta property="og:image" content="${escapeHtml(meta.ogImage)}">` : ""}
+  <meta property="article:published_time" content="${escapeHtml(meta.date)}">
+  ${meta.authors.map((a) => `<meta property="article:author" content="${escapeHtml(a)}">`).join("\n  ")}
+
+  <!-- Twitter Card -->
+  <meta name="twitter:card" content="summary_large_image">
+  <meta name="twitter:title" content="${safeTitle}">
+  <meta name="twitter:description" content="${safeDesc}">
+  ${meta.ogImage ? `<meta name="twitter:image" content="${escapeHtml(meta.ogImage)}">` : ""}
+
+  <!-- KaTeX CSS -->
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.16.21/dist/katex.min.css"
+        integrity="sha384-zh0CIslj3dQfMxK3pZnPJAb3bprHitCE2vBz9TyOTICAn3fso5GYa90qPNMBclov"
+        crossorigin="anonymous">
+
+  <!-- highlight.js theme -->
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/gh/highlightjs/cdn-release@11.9.0/build/styles/github-dark.min.css">
+
+  <style>
+${cssTokens}
+${cssArticle}
+
+/* Published article layout */
+body {
+  margin: 0;
+  padding: 0;
+  background: var(--bg-primary);
+  color: var(--text-primary);
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
+}
+
+.article-container {
+  max-width: 780px;
+  margin: 0 auto;
+  padding: 2rem 32px 4rem;
+}
+
+.article-header {
+  margin-bottom: 2rem;
+  padding-bottom: 1.5rem;
+  border-bottom: 1px solid var(--border);
+}
+
+.article-header h1 {
+  font-size: 2.5rem;
+  font-weight: 700;
+  color: var(--text-heading);
+  line-height: 1.2;
+  margin: 0 0 0.5rem;
+  letter-spacing: -0.02em;
+}
+
+.article-header .authors {
+  color: var(--text-secondary);
+  font-size: 0.9375rem;
+  margin-bottom: 0.25rem;
+}
+
+.article-header .date {
+  color: var(--text-tertiary);
+  font-size: 0.8125rem;
+}
+
+/* Theme toggle */
+.theme-toggle {
+  position: fixed;
+  top: 1rem;
+  right: 1rem;
+  background: var(--bg-secondary);
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  padding: 0.5rem;
+  cursor: pointer;
+  font-size: 1.2rem;
+  line-height: 1;
+  z-index: 100;
+}
+
+/* Accordion as details/summary */
+details[data-component="accordion"] {
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  padding: 0;
+  margin: 1em 0;
+}
+
+details[data-component="accordion"] > summary {
+  padding: 0.75rem 1rem;
+  cursor: pointer;
+  font-weight: 600;
+  color: var(--text-heading-secondary);
+  list-style: none;
+  user-select: none;
+}
+
+details[data-component="accordion"] > summary::-webkit-details-marker {
+  display: none;
+}
+
+details[data-component="accordion"] > summary::before {
+  content: "▸";
+  display: inline-block;
+  margin-right: 0.5rem;
+  transition: transform 0.2s;
+}
+
+details[data-component="accordion"][open] > summary::before {
+  transform: rotate(90deg);
+}
+
+details[data-component="accordion"] > .accordion-content {
+  padding: 0 1rem 1rem;
+}
+
+/* Image lightbox dialog */
+dialog.lightbox {
+  border: none;
+  background: transparent;
+  padding: 0;
+  max-width: 95vw;
+  max-height: 95vh;
+}
+
+dialog.lightbox::backdrop {
+  background: rgba(0, 0, 0, 0.85);
+}
+
+dialog.lightbox img {
+  max-width: 95vw;
+  max-height: 90vh;
+  object-fit: contain;
+  border-radius: 4px;
+}
+  </style>
+</head>
+<body>
+  <button class="theme-toggle" aria-label="Toggle theme" onclick="toggleTheme()">🌓</button>
+
+  <article class="article-container">
+    <header class="article-header">
+      <h1>${safeTitle}</h1>
+      ${authorsStr ? `<p class="authors">${escapeHtml(authorsStr)}</p>` : ""}
+      ${meta.date ? `<p class="date">${escapeHtml(formatDate(meta.date))}</p>` : ""}
+    </header>
+
+    <div class="tiptap">
+      ${enrichedBody}
+    </div>
+  </article>
+
+  <!-- Image lightbox -->
+  <dialog class="lightbox" id="lightbox">
+    <img id="lightbox-img" src="" alt="">
+  </dialog>
+
+  <script>
+    // Theme toggle
+    function toggleTheme() {
+      const html = document.documentElement;
+      const current = html.getAttribute('data-theme');
+      html.setAttribute('data-theme', current === 'dark' ? 'light' : 'dark');
+    }
+
+    // Image lightbox
+    document.querySelectorAll('.tiptap img').forEach(function(img) {
+      img.style.cursor = 'zoom-in';
+      img.addEventListener('click', function() {
+        var d = document.getElementById('lightbox');
+        document.getElementById('lightbox-img').src = img.src;
+        d.showModal();
+      });
+    });
+    document.getElementById('lightbox').addEventListener('click', function(e) {
+      if (e.target === this) this.close();
+    });
+
+    // Glossary tooltips
+    document.querySelectorAll('[data-type="glossary"]').forEach(function(el) {
+      el.setAttribute('tabindex', '0');
+    });
+  </script>
+</body>
+</html>`;
+}
+
+/**
+ * Post-process the raw generateHTML output:
+ * - Transform accordion divs into <details><summary>
+ * - Transform htmlEmbed into iframes
+ * - Add semantic structure where possible
+ */
+function postProcess(html: string): string {
+  let result = html;
+
+  // Accordion: div[data-component="accordion"] → <details><summary>
+  result = result.replace(
+    /<div[^>]*data-component="accordion"[^>]*>([\s\S]*?)<\/div>/g,
+    (_match, inner) => {
+      const titleMatch = inner.match(/data-title="([^"]*)"/);
+      const openMatch = inner.match(/data-open="true"/);
+      const title = titleMatch ? titleMatch[1] : "Details";
+      return `<details data-component="accordion"${openMatch ? " open" : ""}>
+        <summary>${escapeHtml(title)}</summary>
+        <div class="accordion-content">${inner}</div>
+      </details>`;
+    }
+  );
+
+  // HtmlEmbed: div[data-component="htmlEmbed"] → iframe with srcdoc
+  result = result.replace(
+    /<div[^>]*data-component="htmlEmbed"[^>]*data-src="([^"]*)"[^>]*><\/div>/g,
+    (_match, src) => {
+      return `<div class="html-embed-container">
+        <iframe srcdoc="" data-embed-src="${escapeHtml(src)}" 
+                style="width:100%;border:none;min-height:400px;"
+                loading="lazy" sandbox="allow-scripts"></iframe>
+      </div>`;
+    }
+  );
+
+  return result;
+}
+
+function escapeHtml(str: string): string {
+  return str
+    .replace(/&/g, "&amp;")
+    .replace(/</g, "&lt;")
+    .replace(/>/g, "&gt;")
+    .replace(/"/g, "&quot;")
+    .replace(/'/g, "&#039;");
+}
+
+function formatDate(dateStr: string): string {
+  try {
+    return new Date(dateStr).toLocaleDateString("en-US", {
+      year: "numeric",
+      month: "long",
+      day: "numeric",
+    });
+  } catch {
+    return dateStr;
+  }
+}

backend/src/publisher/index.ts

@@ -0,0 +1,176 @@
+/**
+ * Publish pipeline entry point.
+ *
+ * Orchestrates: Y.Doc → JSON → HTML → PDF/Thumbnail → Upload to HF
+ */
+
+import { readFileSync, existsSync } from "fs";
+import { join, dirname } from "path";
+import { fileURLToPath } from "url";
+import * as Y from "yjs";
+import { renderArticleHTML, type PublishMeta } from "./html-renderer.js";
+import { isPdfEnabled, generatePdfAndThumbnail } from "./pdf-generator.js";
+import {
+  isHfStorageEnabled,
+  uploadPublishedAssets,
+} from "../hf-storage.js";
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const DATA_DIR = join(__dirname, "..", "..", "data");
+
+function docPath(name: string) {
+  return join(DATA_DIR, `${name.replace(/[^a-zA-Z0-9_-]/g, "_")}.yjs`);
+}
+
+/**
+ * Load CSS files for injection into the published HTML.
+ */
+function loadCSS(): { tokens: string; article: string } {
+  const frontendStyles = join(__dirname, "..", "..", "..", "frontend", "src", "styles");
+  const distStyles = join(__dirname, "..", "frontend-dist", "assets");
+
+  let tokens = "";
+  let article = "";
+
+  // Development: read source files directly
+  const tokensPath = join(frontendStyles, "tokens.css");
+  const articlePath = join(frontendStyles, "article.css");
+
+  if (existsSync(tokensPath)) {
+    tokens = readFileSync(tokensPath, "utf-8");
+    article = readFileSync(articlePath, "utf-8");
+  }
+
+  return { tokens, article };
+}
+
+/**
+ * Extract TipTap JSON and frontmatter from a Yjs document.
+ */
+function extractFromYDoc(ydoc: Y.Doc): {
+  json: Record<string, unknown>;
+  frontmatter: Record<string, unknown>;
+} {
+  const fragment = ydoc.getXmlFragment("default");
+
+  // The Hocuspocus/TipTap collaboration stores the ProseMirror document
+  // inside a Y.XmlFragment. We need to extract it as JSON.
+  // For now, we'll try reading the JSON from the shared map if available.
+  const metaMap = ydoc.getMap("frontmatter");
+  const frontmatter: Record<string, unknown> = {};
+
+  metaMap.forEach((value, key) => {
+    frontmatter[key] = value;
+  });
+
+  // TipTap JSON is stored as the XmlFragment's prosemirror representation
+  // We need to reconstruct it. The simplest approach: store the JSON
+  // in a shared type when the editor saves.
+  const jsonMap = ydoc.getMap("tiptap-json");
+  const stored = jsonMap.get("doc");
+
+  if (stored && typeof stored === "object") {
+    return { json: stored as Record<string, unknown>, frontmatter };
+  }
+
+  // Fallback: return empty doc
+  return {
+    json: { type: "doc", content: [{ type: "paragraph" }] },
+    frontmatter,
+  };
+}
+
+export interface PublishResult {
+  htmlUrl: string | null;
+  pdfUrl: string | null;
+  thumbUrl: string | null;
+  success: boolean;
+  error?: string;
+}
+
+/**
+ * Run the full publish pipeline for a document.
+ */
+export async function publishDocument(docName: string): Promise<PublishResult> {
+  const p = docPath(docName);
+
+  if (!existsSync(p)) {
+    return { htmlUrl: null, pdfUrl: null, thumbUrl: null, success: false, error: "Document not found" };
+  }
+
+  // Load Yjs document
+  const ydoc = new Y.Doc();
+  const data = readFileSync(p);
+  Y.applyUpdate(ydoc, new Uint8Array(data));
+
+  // Extract content
+  const { json, frontmatter } = extractFromYDoc(ydoc);
+
+  // Build metadata
+  const meta: PublishMeta = {
+    title: (frontmatter.title as string) || docName,
+    description: (frontmatter.description as string) || "",
+    authors: Array.isArray(frontmatter.authors)
+      ? (frontmatter.authors as string[])
+      : [],
+    date: (frontmatter.date as string) || new Date().toISOString(),
+  };
+
+  // Load CSS
+  const css = loadCSS();
+
+  // Generate HTML
+  const html = renderArticleHTML(json, meta, css.tokens, css.article);
+
+  // Generate PDF + thumbnail
+  let pdf: Buffer | null = null;
+  let thumbnail: Buffer | null = null;
+
+  if (isPdfEnabled()) {
+    try {
+      const assets = await generatePdfAndThumbnail(html);
+      pdf = assets.pdf;
+      thumbnail = assets.thumbnail;
+    } catch (err) {
+      console.error("[publish] PDF generation failed:", err);
+    }
+  }
+
+  // Upload to HF dataset
+  if (isHfStorageEnabled()) {
+    try {
+      const urls = await uploadPublishedAssets(docName, {
+        html,
+        pdf,
+        thumbnail,
+        meta: meta as any,
+      });
+      return { ...urls, success: true };
+    } catch (err) {
+      console.error("[publish] Upload failed:", err);
+      return {
+        htmlUrl: null,
+        pdfUrl: null,
+        thumbUrl: null,
+        success: false,
+        error: (err as Error).message,
+      };
+    }
+  }
+
+  // Local-only: save to data/published/
+  const { writeFileSync, mkdirSync } = await import("fs");
+  const publishDir = join(DATA_DIR, "published", docName.replace(/[^a-zA-Z0-9_-]/g, "_"));
+  mkdirSync(publishDir, { recursive: true });
+  writeFileSync(join(publishDir, "index.html"), html);
+  if (pdf) writeFileSync(join(publishDir, "article.pdf"), pdf);
+  if (thumbnail) writeFileSync(join(publishDir, "thumb.jpg"), thumbnail);
+  writeFileSync(join(publishDir, "meta.json"), JSON.stringify(meta, null, 2));
+
+  return {
+    htmlUrl: `/published/${docName}/index.html`,
+    pdfUrl: pdf ? `/published/${docName}/article.pdf` : null,
+    thumbUrl: thumbnail ? `/published/${docName}/thumb.jpg` : null,
+    success: true,
+  };
+}

backend/src/publisher/pdf-generator.ts

@@ -0,0 +1,74 @@
+/**
+ * PDF and OG thumbnail generation via Playwright.
+ *
+ * Launches headless Chromium, loads the published HTML,
+ * waits for rendering, then captures PDF + screenshot.
+ */
+
+let playwrightAvailable = false;
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+let chromium: any;
+
+try {
+  // Dynamic import: playwright is optional (only in Docker production image)
+  const pw = await import(/* @vite-ignore */ "playwright");
+  chromium = pw.chromium;
+  playwrightAvailable = true;
+} catch {
+  console.warn("[publisher] Playwright not installed, PDF/thumbnail generation disabled");
+}
+
+export function isPdfEnabled(): boolean {
+  return playwrightAvailable && process.env.ENABLE_PDF !== "false";
+}
+
+export interface GeneratedAssets {
+  pdf: Buffer | null;
+  thumbnail: Buffer | null;
+}
+
+/**
+ * Generate PDF and OG thumbnail from HTML string.
+ */
+export async function generatePdfAndThumbnail(
+  html: string
+): Promise<GeneratedAssets> {
+  if (!playwrightAvailable) {
+    return { pdf: null, thumbnail: null };
+  }
+
+  const browser = await chromium.launch({
+    args: ["--no-sandbox", "--disable-setuid-sandbox"],
+  });
+
+  try {
+    const page = await browser.newPage();
+
+    await page.setContent(html, { waitUntil: "networkidle" });
+
+    // Wait a bit for fonts, KaTeX, images
+    await page.waitForTimeout(2000);
+
+    // OG Thumbnail (1200x630)
+    await page.setViewportSize({ width: 1200, height: 630 });
+    const thumbnail = await page.screenshot({
+      type: "jpeg",
+      quality: 85,
+      clip: { x: 0, y: 0, width: 1200, height: 630 },
+    });
+
+    // PDF
+    const pdf = await page.pdf({
+      format: "A4",
+      printBackground: true,
+      margin: { top: "1cm", bottom: "1cm", left: "1.5cm", right: "1.5cm" },
+    });
+
+    return {
+      pdf: Buffer.from(pdf),
+      thumbnail: Buffer.from(thumbnail),
+    };
+  } finally {
+    await browser.close();
+  }
+}

backend/src/server.ts

@@ -18,6 +18,7 @@ import {
   flushAll,
 } from "./hf-storage.js";
 import { resolveUser, extractToken, isOAuthEnabled } from "./auth.js";
+import { publishDocument } from "./publisher/index.js";
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
 const DATA_DIR = join(__dirname, "..", "data");
@@ -137,6 +138,38 @@ app.post("/api/chat", handleChat);
 
 app.use("/api/citations", citationsRouter);
 
+// ---------- Publish ----------
+
+app.post("/api/publish", async (req, res) => {
+  // Auth check: only editors can publish
+  if (oauthEnabled) {
+    const token = extractToken(req.headers.cookie);
+    const user = await resolveUser(token);
+    if (!user || !user.canEdit) {
+      res.status(403).json({ error: "Unauthorized: write access required" });
+      return;
+    }
+  }
+
+  const { docName } = req.body as { docName?: string };
+  if (!docName) {
+    res.status(400).json({ error: "docName is required" });
+    return;
+  }
+
+  try {
+    const result = await publishDocument(docName);
+    if (!result.success) {
+      res.status(500).json({ error: result.error || "Publish failed" });
+      return;
+    }
+    res.json(result);
+  } catch (err: any) {
+    console.error("[publish] error:", err);
+    res.status(500).json({ error: err.message || "Publish failed" });
+  }
+});
+
 // ---------- Image Upload ----------
 
 const upload = multer({ storage: multer.memoryStorage(), limits: { fileSize: 10 * 1024 * 1024 } });
@@ -172,6 +205,48 @@ app.post("/api/upload", upload.single("file"), async (req, res) => {
 // Serve locally uploaded images
 app.use("/uploads", express.static(join(DATA_DIR, "uploads")));
 
+// Serve locally published articles
+app.use("/published", express.static(join(DATA_DIR, "published")));
+
+// ---------- Image proxy for private datasets ----------
+
+app.get("/api/images/*", async (req, res) => {
+  const imagePath = (req.params as any)[0] as string;
+  if (!imagePath || imagePath.includes("..")) {
+    res.status(400).send("Invalid path");
+    return;
+  }
+
+  const HF_DATASET_ID = process.env.HF_DATASET_ID || "";
+  const HF_TOKEN = process.env.HF_TOKEN || "";
+
+  if (!HF_DATASET_ID || !HF_TOKEN) {
+    res.status(404).send("Not configured");
+    return;
+  }
+
+  try {
+    const url = `https://huggingface.co/datasets/${HF_DATASET_ID}/resolve/main/images/${imagePath}`;
+    const response = await fetch(url, {
+      headers: { Authorization: `Bearer ${HF_TOKEN}` },
+    });
+
+    if (!response.ok) {
+      res.status(response.status).send("Not found");
+      return;
+    }
+
+    const contentType = response.headers.get("content-type");
+    if (contentType) res.setHeader("Content-Type", contentType);
+    res.setHeader("Cache-Control", "public, max-age=86400");
+
+    const buffer = Buffer.from(await response.arrayBuffer());
+    res.send(buffer);
+  } catch {
+    res.status(500).send("Proxy error");
+  }
+});
+
 // ---------- Static frontend ----------
 
 const staticDir =
@@ -181,7 +256,46 @@ const staticDir =
 
 if (existsSync(staticDir)) {
   app.use(express.static(staticDir));
-  app.get("*", (_req, res) => {
+
+  app.get("*", async (req, res) => {
+    // If OAuth is enabled, serve published HTML to unauthenticated visitors
+    if (oauthEnabled) {
+      const token = extractToken(req.headers.cookie);
+      const user = await resolveUser(token);
+
+      if (!user || !user.canEdit) {
+        // Try to serve published version
+        const docMatch = req.query.doc as string | undefined;
+        const docName = docMatch || "default";
+        const safeName = docName.replace(/[^a-zA-Z0-9_-]/g, "_");
+        const publishedPath = join(DATA_DIR, "published", safeName, "index.html");
+
+        if (existsSync(publishedPath)) {
+          res.sendFile(publishedPath);
+          return;
+        }
+
+        // No published version: show a simple message
+        if (!user) {
+          res.status(200).send(`
+            <!DOCTYPE html>
+            <html>
+            <head><title>Collab Editor</title></head>
+            <body style="display:flex;align-items:center;justify-content:center;height:100vh;margin:0;font-family:system-ui;background:#0a0a0a;color:#aaa;">
+              <div style="text-align:center;">
+                <h1 style="color:#fff;">This article is not yet published</h1>
+                <p>Log in with your Hugging Face account to edit.</p>
+                <a href="/oauth/authorize" style="color:#958DF1;">Log in</a>
+              </div>
+            </body>
+            </html>
+          `);
+          return;
+        }
+      }
+    }
+
+    // Authenticated editors get the SPA
     res.sendFile(join(staticDir, "index.html"));
   });
 }

backend/src/types.d.ts

@@ -0,0 +1,11 @@
+declare module "@citation-js/core";
+declare module "@citation-js/plugin-bibtex";
+declare module "@citation-js/plugin-csl";
+declare module "@citation-js/plugin-doi";
+
+// Playwright is optional - only available in Docker production image
+declare module "playwright" {
+  export const chromium: {
+    launch(options?: Record<string, unknown>): Promise<any>;
+  };
+}