feat(ui): comprehensive design system improvements

This PR addresses 53 design issues identified in the UI codebase,
implementing a more consistent and polished neobrutalism design system.

Typography:
- Improved font stacks with proper fallbacks
- Added font smoothing for crisp text rendering

Color/Theme:
- Added neutral scale (50-900) for consistent grays
- Added semantic log level colors with dark mode variants
- Added category colors for feature cards
- Added GLM badge color variable
- Full dark mode support for all new variables

Design Tokens:
- Spacing scale (xs to 2xl)
- Z-index scale (dropdown to toast)
- Border radius tokens
- Inset shadow variants

Animations:
- New transition timing variables
- New easing curves (bounce, smooth, out-back)
- Slide-in animations (top/bottom/left)
- Bounce, shake, scale-pop animations
- Stagger delay utilities
- Enhanced YOLO fire effect with parallax layers

Components:
- Button size variants (sm/lg/icon) and loading state
- Input variants (error/disabled/textarea)
- Badge color and size variants
- Card elevation variants (elevated/flat/sunken)
- Progress bar shimmer animation
- Stronger modal backdrop with blur
- Neobrutalist tooltips
- Enhanced empty state with striped pattern

Component Fixes:
- Replaced hardcoded colors with CSS variables
- Fixed ProgressDashboard percentage alignment
- Improved ChatMessage role-specific styling
- Consistent category badge colors in FeatureModal
- Improved step input styling in forms

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ui/src/components/ConfirmDialog.tsx

@@ -55,12 +55,12 @@ export function ConfirmDialog({
         <div className="flex items-center justify-between p-4 border-b-3 border-[var(--color-neo-border)]">
           <div className="flex items-center gap-3">
             <div
-              className="p-2 border-2 border-[var(--color-neo-border)] shadow-[2px_2px_0px_rgba(0,0,0,1)]"
-              style={{ backgroundColor: colors.icon }}
+              className="p-2 border-2 border-[var(--color-neo-border)]"
+              style={{ boxShadow: 'var(--shadow-neo-sm)', backgroundColor: colors.icon }}
             >
-              <AlertTriangle size={20} className="text-white" />
+              <AlertTriangle size={20} className="text-[var(--color-neo-text-on-bright)]" />
             </div>
-            <h2 className="font-display font-bold text-lg text-[#1a1a1a]">
+            <h2 className="font-display font-bold text-lg text-[var(--color-neo-text)]">
               {title}
             </h2>
           </div>