feat: Luminous Depth UI redesign

Complete visual overhaul of the Aryx application with the Luminous Depth
design language — blue-tinted dark surfaces, brand gradient accents,
glass-morphism effects, and refined typography.

Design Foundation:
- New color system with CSS custom properties for all surfaces, borders,
  text, accents, and status colors
- Typography: Outfit (display), DM Sans (body), JetBrains Mono (code)
- Animations: accent-flow, thinking-wave, ambient-glow
- Utility classes: glass-surface, glow-border, brand-gradient-bg/text
- Light theme with cool-tinted whites and blue-tinted shadows

Components Updated:
- UI primitives (TextInput, SelectInput, ToggleSwitch, FormField, etc.)
- AppShell with ambient glow background
- Sidebar with brand gradient selection and accent-flow running bars
- ChatPane with semantic phase tinting and gradient user avatars
- WelcomePane with nebula background and motion entrance animations
- All chat banners (Approval, UserInput, PlanReview, MCP Auth, etc.)
- ActivityPanel and RunTimeline with glass-surface cards
- Settings panels, modals, and editor shells
- TerminalPanel with harmonized ANSI palette
- PatternGraph nodes with glass-surface styling
- MarkdownComposer toolbar

Zero hardcoded zinc/indigo color classes remain in renderer components.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

bun.lock

@@ -5,7 +5,11 @@
     "": {
       "name": "kopaya",
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+        "@fontsource-variable/jetbrains-mono": "^5.2.8",
+        "@fontsource-variable/outfit": "^5.2.8",
         "keytar": "^7.9.0",
+        "motion": "^12.38.0",
         "node-pty": "^1.1.0",
       },
       "devDependencies": {
@@ -157,6 +161,12 @@
 
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@@ -831,6 +843,12 @@
 
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+
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@@ -1011,6 +1029,8 @@
 
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