fix(insights): peek panel rend correctement le contenu TipTap

Avant: prose prose-sm générique → titres/images/tables/callouts/toggles cassés
Maintenant: prose-lg + editor-body + 20+ overrides CSS pour:
- h1/h2/h3 tailles serif comme l'éditeur
- listes, blockquotes, code blocks, pre
- images arrondies + max-width
- tables avec borders
- callouts (data-callout-type)
- toggles (data-type=toggle-block)
- math (data-math)
- hr separators

.cursor/hooks/state/continual-learning.json

@@ -1,8 +1,8 @@
 {
   "version": 1,
   "lastRunAtMs": 1783196565768,
-  "turnsSinceLastRun": 0,
+  "turnsSinceLastRun": 3,
   "lastTranscriptMtimeMs": 1783196565691.0437,
-  "lastProcessedGenerationId": "568a0443-fffa-4861-8651-2264944e9cc3",
+  "lastProcessedGenerationId": "d7e4c90f-1f03-4437-a235-3553b9f9cb09",
   "trialStartedAtMs": null
 }