Add study templates, exports, breadcrumb, whole-Bible search, bookmarks UX, and share links

- Study templates: richer multi-line guiding questions in the OIA placeholders
- PDF/print export: reuses buildExportHtml in a new tab + window.print()
- Markdown export: new buildMarkdownExport() with matching tests
- Breadcrumb: current chunk's passage reference shown in the Study page header
- Reader bookmarks: SVG icons instead of ambiguous emoji, always visible
  (not hover-only, so it works on touch devices), plus a Bookmarks panel
  that lists all saved verses across every book and jumps + scrolls to them
- Whole-Bible search: no server-side search endpoint exists, so this fetches
  the full translation once (~7MB) and searches an in-memory flat verse
  index client-side, with results linking back into the reader
- Read-only share links: per-project share token, a public unauthenticated
  /api/share/:token endpoint, and a ?share=TOKEN view that bypasses the auth
  gate entirely and renders the export HTML in a script-sandboxed iframe

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

server/index.js

@@ -8,6 +8,7 @@ import {
   initDb, getAllProjects, getProject, upsertProject, deleteProject,
   countUsers, createUser, getUserByEmail, getUserById, claimOrphanProjects,
   enableTotp, disableTotp, setBackupCodeHashes, setPodcastName,
+  getShareToken, setShareToken, clearShareToken, getProjectByShareToken,
 } from './db.js';
 import { SqliteSessionStore } from './sessionStore.js';
 import {
@@ -304,6 +305,59 @@ app.delete('/api/projects/:id', requireAuth, (req, res) => {
   }
 });
 
+// ---------------------------------------------------------------------------
+// Read-only share links
+// ---------------------------------------------------------------------------
+
+// GET /api/projects/:id/share — current share status for the project owner
+app.get('/api/projects/:id/share', requireAuth, (req, res) => {
+  try {
+    const project = getProject(req.params.id, req.session.userId);
+    if (!project) return res.status(404).json({ error: 'Project not found.' });
+    res.json({ shareToken: getShareToken(req.params.id, req.session.userId) });
+  } catch (err) {
+    console.error('GET /api/projects/:id/share error:', err);
+    res.status(500).json({ error: 'Failed to load share status.' });
+  }
+});
+
+// POST /api/projects/:id/share — enable sharing, returns the (new or existing) token
+app.post('/api/projects/:id/share', requireAuth, (req, res) => {
+  try {
+    const existing = getShareToken(req.params.id, req.session.userId);
+    const token = existing || randomUUID().replace(/-/g, '');
+    const ok = setShareToken(req.params.id, req.session.userId, token);
+    if (!ok) return res.status(404).json({ error: 'Project not found.' });
+    res.json({ shareToken: token });
+  } catch (err) {
+    console.error('POST /api/projects/:id/share error:', err);
+    res.status(500).json({ error: 'Failed to enable sharing.' });
+  }
+});
+
+// DELETE /api/projects/:id/share — revoke the share link
+app.delete('/api/projects/:id/share', requireAuth, (req, res) => {
+  try {
+    clearShareToken(req.params.id, req.session.userId);
+    res.json({ ok: true });
+  } catch (err) {
+    console.error('DELETE /api/projects/:id/share error:', err);
+    res.status(500).json({ error: 'Failed to revoke sharing.' });
+  }
+});
+
+// GET /api/share/:token — PUBLIC, no login required: fetch a shared project read-only
+app.get('/api/share/:token', (req, res) => {
+  try {
+    const project = getProjectByShareToken(req.params.token);
+    if (!project) return res.status(404).json({ error: 'This share link is invalid or has been revoked.' });
+    res.json(project);
+  } catch (err) {
+    console.error('GET /api/share/:token error:', err);
+    res.status(500).json({ error: 'Failed to load shared project.' });
+  }
+});
+
 // ---------------------------------------------------------------------------
 // Serve Vite production build (when NODE_ENV=production)
 // ---------------------------------------------------------------------------