refactor(ui): port exact Archy glassmorphism system

Replace all glass morphism CSS with exact Archy definitions from
neode-ui/src/style.css. Every container and button class now matches
Archy pixel-for-pixel:

- glass: rgba(0,0,0,0.35), blur(18px), border rgba(255,255,255,0.18)
- glass-strong: same bg, blur(24px)
- glass-card: rgba(0,0,0,0.65), blur(18px), border-radius 1rem
- glass-button: 48px height, rgba(0,0,0,0.6), blur(18px)
- glass-button-sm: compact variant
- gradient-button: primary CTA with gradient intensification on hover
- gradient-card, gradient-card-dark, gradient-border-container
- toast-glass, nav-tab-active with CSS mask gradient border
- Archy inset highlight: inset 0 1px 0 rgba(255,255,255,0.22)
- Archy focus glow: blue box-shadow, no outline
- Archy scrollbar: gradient thumb, hidden variant
- Archy animations: fadeUpIn 900ms cubic-bezier(0.22, 1, 0.36, 1)

Updated design rules (02-tailwind-styling.mdc, 03-design-system.mdc)
to reference Archy as canonical source. Added archy-glass-system.md
to Coding Rules Project.

Made-with: Cursor

packages/app/src/components/widget/WidgetFab.vue

@@ -1,9 +1,9 @@
 <template>
   <button
-    class="fixed z-50 w-14 h-14 rounded-full glass-strong flex items-center justify-center
-           shadow-lg hover:shadow-xl transition-all duration-300
-           hover:scale-105 active:scale-95 glow-accent"
+    class="fixed z-50 w-14 h-14 rounded-full glass-button flex items-center justify-center
+           transition-all duration-300 hover:scale-105 active:scale-95"
     :class="positionClasses"
+    :style="{ boxShadow: '0 8px 24px rgba(0, 0, 0, 0.45), 0 0 20px rgba(247, 147, 26, 0.15)' }"
     :aria-label="isOpen ? 'Close AIUI' : 'Open AIUI'"
     @click="$emit('toggle')"
   >

packages/app/src/components/widget/WidgetModal.vue

@@ -7,8 +7,8 @@
         :class="positionClasses"
       >
         <div
-          class="w-[380px] h-[600px] md:w-[420px] md:h-[640px] rounded-2xl overflow-hidden shadow-2xl"
-          :style="{ boxShadow: '0 20px 60px rgba(0, 0, 0, 0.5), 0 0 40px rgba(247, 147, 26, 0.08)' }"
+          class="w-[380px] h-[600px] md:w-[420px] md:h-[640px] glass-card overflow-hidden"
+          :style="{ boxShadow: '0 20px 60px rgba(0, 0, 0, 0.6), 0 0 40px rgba(247, 147, 26, 0.06)' }"
         >
           <ChatWindow
             variant="modal"