feat: add global date format preferences with timezone support

Implements a synchronized date format toggle across all timestamps
with persistent user preferences. Timestamps now support three format
views (relative, absolute, ISO) with tooltips and copy functionality.
Adds automatic timezone detection and display.

package.json

@@ -27,10 +27,13 @@
 		"@fontsource/ibm-plex-mono": "^5.2.7",
 		"@mantine/hooks": "^8.3.5",
 		"@radix-ui/react-icons": "^1.3.2",
+		"@radix-ui/react-tooltip": "^1.2.8",
 		"@radix-ui/themes": "^3.2.1",
 		"@swc/helpers": "^0.5.11",
 		"clsx": "^2.1.1",
 		"date-fns": "^4.1.0",
+		"date-fns-tz": "^3.2.0",
+		"lucide-react": "^0.546.0",
 		"next": "^15.5.6",
 		"next-themes": "^0.4.6",
 		"react": "19.2.0",