refactor: CSS utility tridy + slouceni badge souboru

- pridano 20 utility trid (flex-1, mb-2, text-right, fw-500, admin-spinner-sm, atd.)
- nahrazeno ~100 opakovanych inline stylu ve 39 JSX souborech
- slouceno leave.css, orders.css, projects.css do admin.css (status badges)
- bundle size: 228.91 -> 228.43 kB (-0.48 kB)

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

dist/api/rate_limits/92f2e2a3520918dc3a4f54cfed15fbfe.json

@@ -1 +1 @@
-{"window_start":1773395802,"count":2}
+{"window_start":1773397556,"count":8}

dist/api/rate_limits/95bc5d544df53a813f55a3a2ae270497.json

@@ -1 +1 @@
-{"window_start":1773395237,"count":1}
+{"window_start":1773396919,"count":1}