Fold the access-code explanation into the Questions line

The 'only sharing needs a code' note only appeared inside the Share tab, after
someone had already hit the code prompt. Moving it up to the Questions line puts
it above the tabs, where a student sees it before picking one, and drops the
now-duplicated info box from the locked branch.

The 'see How it works' clause goes with it, since the sentence it now joins
already points at that tab.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

app.py

@@ -304,8 +304,10 @@ st.markdown(
 # told where the long answer lives. The tabs are right below this line, and the
 # about tab is open to everyone, with no access code needed to read it.
 st.markdown(
-    "**Questions?** Open the **How it works** tab below. It shows exactly "
-    "what gets removed, what stays in, and who can see your report."
+    "**Questions?** Open the **How it works** tab below: it shows exactly "
+    "what gets removed, what stays in, and who can see your report. "
+    "**Only sharing needs a code.** If you already submitted a report and want "
+    "it deleted, open the **Delete my report** tab, no code required."
 )
 
 # ============================================================================
@@ -585,10 +587,6 @@ with tab_share:
             else:
                 st.caption("If you're a USC student using this, whoever referred "
                            "you should've shared a passphrase.")
-            st.info("**Only sharing needs a code.** If you already submitted a "
-                    "report and want it deleted, open the **Delete my report** "
-                    "tab, no code required. Curious what the tool does? See "
-                    "**How it works**.")
         else:
             _uploaded = _render_upload_step()
             _have_redaction = _render_review_step() if _uploaded is not None else False