feat(insights): UX gap closure — i18n, network graph, recalc panel, toasts

Bugs fixes:
- network-graph.tsx: 2 strings hardcoded FR → props i18n (untitledLabel, resetFocusLabel)
- Panneau recalcul: clés i18n réutilisées avec mauvais sens → nouvelles clés recalcSystem.*
- 13 locales: section insightsView.* complète (67 clés × 13 = 871 traductions)

UX features:
- Hint /insights ≠ /graph (semanticGraphLegend + lien vers /graph)
- Toasts succès/échec/zéro-clusters après analyse (analysisSuccess/Failed/NoClusters)
- État vide différencié: emptyNeedMoreNotes si < 10 notes
- Tips contextuels sections Bridge Notes et Suggestions

Sprint:
- 4 epics marqués done (3,4,5,6 — toutes stories terminées)
- sprint-status.yaml last_updated corrigé

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

@@ -59,11 +59,13 @@
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-  "/home/devparsa/.cursor/projects/home-devparsa-dev-Momento/agent-transcripts/ec2b194c-c67e-4089-a434-6daff69ca69d/ec2b194c-c67e-4089-a434-6daff69ca69d.jsonl": 1782057901186,
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 }

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

@@ -1,8 +1,8 @@
 {
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