Fix hero contrast and validation repair errors

app.py

@@ -452,6 +452,11 @@ def extract_pdf(paper: dict[str, Any], max_chars: int = 14000) -> str:
     return "\n".join(pages)[:max_chars]
 
 
+def serializable_validation_errors(exc: ValidationError) -> list[dict[str, Any]]:
+    """Remove exception objects and raw inputs before sending validation feedback to the model."""
+    return exc.errors(include_url=False, include_context=False, include_input=False)
+
+
 def validate_stage_with_repairs(
     result: dict[str, Any],
     model_type: type[BaseModel],
@@ -469,7 +474,7 @@ def validate_stage_with_repairs(
             candidate = chat_json(
                 f"Repair the {stage_name} JSON. Preserve valid content, fill missing fields, and return only the complete corrected object.",
                 json.dumps({
-                    "validation_errors": exc.errors(include_url=False),
+                    "validation_errors": serializable_validation_errors(exc),
                     "object_to_repair": candidate,
                     "source_context": source_context,
                     "schema": model_type.model_json_schema(),
@@ -703,7 +708,7 @@ def validate_report_with_repairs(report: dict[str, Any], context: dict[str, Any]
                 "Repair an incomplete algorithm research report. Preserve its chosen research type, outline, layouts, and valid content. "
                 "Fix only schema-invalid fields. Return the complete report as one JSON object and never invent source IDs.",
                 json.dumps({
-                    "validation_errors": exc.errors(include_url=False),
+                    "validation_errors": serializable_validation_errors(exc),
                     "report_to_repair": candidate,
                     "evidence_cards": context.get("evidence_cards", []),
                     "schema": ResearchReport.model_json_schema(),
@@ -1017,7 +1022,7 @@ def run_research_ui(
 
 
 CSS = """
-.gradio-container{max-width:none!important;padding-top:30px!important;background:linear-gradient(145deg,#f7f9fc,#eef3f8)!important}.app-hero{position:relative;z-index:0;margin:8px 4px 18px;padding:18px 22px;border:1px solid #dce5ef;border-radius:16px;background:linear-gradient(120deg,#0c1d2d,#153651);color:#fff;box-shadow:0 12px 35px #16334d1a}.app-hero h1{margin:0 0 5px;font-size:25px}.app-hero p{margin:0;color:#bcd0e3}.app-hero span{display:inline-block;margin-top:10px;padding:4px 8px;border:1px solid #ffffff2b;border-radius:999px;color:#82ead8;font-size:11px}
+.gradio-container{max-width:none!important;background:linear-gradient(145deg,#f7f9fc,#eef3f8)!important}.app-hero{margin:4px 4px 18px;padding:18px 22px;border:1px solid #dce5ef;border-radius:16px;background:linear-gradient(120deg,#0c1d2d,#153651);color:#fff;box-shadow:0 12px 35px #16334d1a}.app-hero h1{margin:0 0 5px;color:#fff!important;font-size:25px}.app-hero p{margin:0;color:#fff!important}.app-hero span{display:inline-block;margin-top:10px;padding:4px 8px;border:1px solid #ffffff2b;border-radius:999px;color:#82ead8;font-size:11px}
 .preview-column{min-width:0}.input-column{max-width:430px;padding:14px!important;border:1px solid #dce5ef;border-radius:14px;background:#ffffffb8;box-shadow:0 10px 30px #1a38500d}
 .preview-toolbar{align-items:center!important;justify-content:flex-end!important;gap:6px!important;min-height:38px}
 .preview-title{margin-right:auto!important;min-width:180px}.download-chip{flex:0 0 auto!important;min-width:42px!important;max-width:52px!important;position:relative}

tests/test_app.py

@@ -1,9 +1,10 @@
+import json
 import unittest
 from unittest.mock import patch
 
 from pydantic import ValidationError
 
-from app import ResearchReport, chat_json, deduplicate, infer_section_source_ids, normalize_comparison, normalize_process, parse_json_object, prepare_evidence_inputs, render_presentation, render_section_content, render_value, safe_slug, search_literature
+from app import ResearchReport, chat_json, deduplicate, infer_section_source_ids, normalize_comparison, normalize_process, parse_json_object, prepare_evidence_inputs, render_presentation, render_section_content, render_value, safe_slug, search_literature, serializable_validation_errors
 
 
 def base_report(section):
@@ -97,6 +98,17 @@ class AppTests(unittest.TestCase):
         with self.assertRaises(ValidationError):
             ResearchReport.model_validate(base_report(section))
 
+    def test_validation_feedback_is_json_serializable(self):
+        section = {"title": "Invalid", "purpose": "Trigger a custom validator error.", "takeaway": "The timeline is intentionally incomplete.", "layout": "timeline", "content": {"nodes": []}, "source_ids": []}
+        try:
+            ResearchReport.model_validate(base_report(section))
+        except ValidationError as exc:
+            errors = serializable_validation_errors(exc)
+        else:
+            self.fail("Expected report validation to fail")
+        json.dumps(errors)
+        self.assertNotIn("ctx", errors[0])
+
     def test_comparison_requires_rows(self):
         section = {"title": "Compare", "purpose": "Compare engineering alternatives fairly.", "takeaway": "No choice is universally optimal here.", "layout": "comparison", "content": {"columns": ["speed", "quality"], "rows": []}, "source_ids": []}
         with self.assertRaises(ValidationError):