fix(chart): improve error handling and color variety

- Add quotaExceeded flag to response for better error UX
- Show dedicated quota exceeded state with upgrade button
- Improve AI prompt to better detect data patterns
- Add chart type-specific colors (blue, indigo, emerald, violet, etc.)
- Replace generic primary/10 colors with varied accent colors

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

memento-note/lib/ai/tools/slides-palettes.ts

@@ -43,6 +43,21 @@ export const PALETTE_ALIASES: Record<string, string> = {
   premium: 'platinum_white_gold', clean: 'vibrant_tech', stage: 'stage_dark',
   architectural: 'architectural_mono', silk: 'minimal_silk',
   black: 'keynote', white: 'platinum_white_gold', nuit: 'galaxy', sombre: 'stage_dark',
+  
+  // Recipe explicit theme mappings
+  architectural_saas: 'architectural_mono',
+  midnight_cathedral: 'keynote',
+  aurora_borealis: 'galaxy',
+  tokyo_neon: 'vibrant_tech',
+  sunlit_gallery: 'bohemian',
+  clinical_precision: 'modern_wellness',
+  venture_pitch: 'vibrant_orange_mint',
+  forest_floor: 'forest_eco',
+  steel_glass: 'luxury_mystery',
+  cyberpunk_terminal: 'tech_night',
+  editorial_ink: 'vintage_academic',
+  coastal_morning: 'coastal_coral',
+  paper_studio: 'craft_artisan',
 }
 
 export const THEME_NAMES: Record<string, string> = {