fix(ai): include content-bearing pages in reindex coverage; correct progress race & hot path (F6-F10)

F6: extend embeddablePredicate to pages with body content but null text_content,
    keyed on the text-node marker "type":"text" (not a bare "text": key, which
    also matched math nodes' attrs.text and would leave math-only pages stuck
    below 100%). Numerator and denominator share the predicate; tests assert the
    compiled WHERE is byte-identical and a math-only doc is excluded.
F7: correct the start() JSDoc (both totals are the real page count).
F8: nextReindexPollInterval reuses isReindexComplete.
F9: getMasked reads progress first and skips the two COUNTs while a reindex is active.
F10: pre-seed the progress entry with a short 45s TTL so a deduped enqueue's
     phantom "0 of N" expires quickly instead of sticking for the 1h TTL.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/client/src/features/workspace/components/settings/components/ai-provider-settings.tsx

@@ -198,16 +198,18 @@ export function nextReindexPollInterval(args: {
   if (now > deadline) return false;
   // Active run → keep polling even if the momentary counts already look full.
   if (status?.reindexing) return intervalMs;
-  // Finished and fully indexed (incl. an empty workspace, 0 >= 0) → stop.
-  if (status && status.indexedPages >= status.totalPages) return false;
+  // Finished and fully indexed (incl. an empty workspace, 0 >= 0) → stop. Reuse
+  // isReindexComplete so the completeness check lives in exactly one place.
+  if (isReindexComplete(status)) return false;
   // Within the deadline and not yet done → keep polling.
   return intervalMs;
 }
 
 /**
  * Whether the reindex poll deadline should be cleared: the server reports no
- * active run AND the count is complete. Mirrors the stop condition of
- * `nextReindexPollInterval` (sans the cap, which the effect handles via time).
+ * active run AND the count is complete. The single source of truth for the
+ * "reindex finished" check — `nextReindexPollInterval` reuses it for its stop
+ * condition (sans the cap, which the effect handles via time).
  */
 export function isReindexComplete(status?: ReindexStatus): boolean {
   return (