Consolidate duplicate utility functions into shared modules

Extract repeated helper functions from components into shared utils
(colors.ts, date.ts, file.ts) to reduce duplication:
- isLightColor, parseFilamentColor, hexToColorName → utils/colors.ts
- formatMediaTime, formatDurationFromHours → utils/date.ts
- formatFileSize guard hardened for NaN/negative → utils/file.ts
- formatBytes (ToastContext), formatTime (Timelapse*) deduplicated

Functions with subtly different behavior are intentionally kept local
(formatFilament, formatStorageSize, formatBytes, formatUptime,
formatDateTime, formatDate, formatTimeAgo) to preserve exact UI output.

static/index.html

@@ -23,7 +23,7 @@
 
     <!-- Splash screens for iOS -->
     <link rel="apple-touch-startup-image" href="/img/android-chrome-512x512.png" />
-    <script type="module" crossorigin src="/assets/index-PuCtc4fr.js"></script>
+    <script type="module" crossorigin src="/assets/index-BAl7JF0v.js"></script>
     <link rel="stylesheet" crossorigin href="/assets/index-D5I4wfky.css">
   </head>
   <body>