UI Stabilization: Global color theme updates (#75B2D6), AI Assistant styling refactor, and navigation fixes

memento-note/lib/ai/tools/pptx.tool.ts

@@ -60,6 +60,8 @@ const PALETTES: Record<string, Theme> = {
   coastal_coral:       { primary: '005f73', secondary: '0a9396', accent: 'ee9b00', light: 'e9f5f5', bg: 'ffffff' },
   vibrant_orange_mint: { primary: 'e05c00', secondary: '2ec4b6', accent: 'ff9f1c', light: 'edfaf9', bg: 'ffffff' },
   platinum_white_gold: { primary: '0a0a0a', secondary: '404040', accent: 'c9a84c', light: 'f5f5f0', bg: 'ffffff' },
+  architectural_mono:  { primary: '1C1C1C', secondary: '75B2D6', accent: 'D4A373', light: 'EDE9DF', bg: 'F2F0E9' },
+  minimal_silk:        { primary: '212529', secondary: '6c757d', accent: 'dee2e6', light: 'f8f9fa', bg: 'ffffff' },
 }
 
 const PALETTE_ALIASES: Record<string, string> = {
@@ -68,6 +70,7 @@ const PALETTE_ALIASES: Record<string, string> = {
   ocean: 'pure_tech_blue', charcoal: 'platinum_white_gold', teal: 'education_charts',
   berry: 'art_food', cherry: 'vintage_academic', clair: 'pure_tech_blue', light: 'modern_wellness',
   warm: 'bohemian', premium: 'platinum_white_gold', clean: 'vibrant_tech',
+  architectural: 'architectural_mono', silk: 'minimal_silk',
 }
 
 function resolveTheme(spec: PresentationSpec): { theme: Theme; key: string } {
@@ -1085,13 +1088,13 @@ LAYOUTS — choose the most visual for each slide:
 - summary: closing key takeaways
 
 RULES:
+- Use the THEME and STYLE provided in the prompt context.
 - First slide MUST be "title"
 - Second slide: "toc"
 - Use "section" as dividers between major topics
 - Prefer DIAGRAM layouts (timeline, process, metrics, comparison) over plain content
 - Use at least 2 diagram layouts per presentation
 - 8-12 slides, never repeat same layout consecutively
-- For "section" layout: title = section heading, content = [] (the slide number is auto-generated)
 - All text content: max 100 chars per item, concise and impactful`,
 
       inputSchema: z.object({