chore: Tailwind CSS v3 → v4 migration (#99)

* chore: run Tailwind v4 upgrade tool (Phase 1)

- Upgraded tailwindcss v3 → v4.2.1, postcss plugin to @tailwindcss/postcss
- Deleted tailwind.config.js, migrated theme to CSS @theme block in index.css
- Replaced @tailwind directives with @import 'tailwindcss'
- Added @custom-variant dark, @utility blocks for custom utilities
- Updated class names across 128 files (shadow-sm → shadow-xs, etc.)
- Removed autoprefixer (built into v4)
- Added migration plan doc

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* chore: switch from @tailwindcss/postcss to @tailwindcss/vite (Phase 2)

- Replaced @tailwindcss/postcss with @tailwindcss/vite plugin
- Deleted postcss.config.js (no longer needed)
- Tailwind now runs as a native Vite plugin for faster HMR

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* refactor: convert to OKLCH colors, move keyframes into @theme (Phase 3-4)

- Replaced all HSL color indirection with direct OKLCH values in @theme
- Moved all keyframes inside @theme block (v4 pattern)
- Eliminated hsl(var(--x)) double-indirection across 17 component files
- Replaced hsl() inline styles with var(--color-*) theme references
- Cleaned up redundant rdp-* utility blocks
- Fixed @custom-variant dark syntax to use :where()
- Added sidebar/glass/shadow vars as OKLCH in :root

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/session/ShareSessionModal.tsx

@@ -181,7 +181,7 @@ export function ShareSessionModal({ sessionId, sessionLabel, isOpen, onClose }:
     <div className="fixed inset-0 z-50 flex items-center justify-center">
       {/* Backdrop */}
       <div
-        className="absolute inset-0 bg-black/80 backdrop-blur-sm"
+        className="absolute inset-0 bg-black/80 backdrop-blur-xs"
         onClick={onClose}
       />
 
@@ -265,7 +265,7 @@ export function ShareSessionModal({ sessionId, sessionLabel, isOpen, onClose }:
                 placeholder="e.g. Training link, Customer escalation"
                 className={cn(
                   'w-full rounded-md border border-border bg-card px-3 py-2 text-sm text-foreground placeholder-muted-foreground',
-                  'focus:border-primary focus:outline-none focus:ring-1 focus:ring-primary/20'
+                  'focus:border-primary focus:outline-hidden focus:ring-1 focus:ring-primary/20'
                 )}
                 maxLength={100}
               />
@@ -299,8 +299,8 @@ export function ShareSessionModal({ sessionId, sessionLabel, isOpen, onClose }:
                   onChange={(e) => setCustomDatetime(e.target.value)}
                   className={cn(
                     'mt-2 w-full rounded-md border border-border bg-card px-3 py-2 text-sm text-foreground',
-                    'focus:border-primary focus:outline-none focus:ring-1 focus:ring-primary/20',
-                    '[color-scheme:dark]'
+                    'focus:border-primary focus:outline-hidden focus:ring-1 focus:ring-primary/20',
+                    'scheme-dark'
                   )}
                 />
               )}