fix(deps): replace relative-time with date-fns for timestamp formatting

- Replace relative-time package (which uses Temporal API) with date-fns
- Update formatDate to use formatDistanceToNow from date-fns
- Remove relative-time type declarations
- Apply fix to both helpers.ts and bookmarkUtils.tsx
- Fix runtime error: relative-time expects Temporal objects, not Date objects
- date-fns provides better compatibility with current JavaScript standards

node_modules/.package-lock.json

@@ -2613,6 +2613,16 @@
       "integrity": "sha512-M1uQkMl8rQK/szD0LNhtqxIPLpimGm8sOBwU7lLnCpSbTyY3yeU1Vc7l4KT5zT4s/yOxHH5O7tIuuLOCnLADRw==",
       "license": "MIT"
     },
+    "node_modules/date-fns": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/date-fns/-/date-fns-4.1.0.tgz",
+      "integrity": "sha512-Ukq0owbQXxa/U3EGtsdVBkR1w7KOQ5gIBqdH2hkvknzZPYvBxb/aa6E8L7tmjFtkwZBu3UXBbjIgPo/Ez4xaNg==",
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/kossnocorp"
+      }
+    },
     "node_modules/debug": {
       "version": "4.4.3",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
@@ -5027,12 +5037,6 @@
         "node": ">=0.10.0"
       }
     },
-    "node_modules/relative-time": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/relative-time/-/relative-time-2.1.0.tgz",
-      "integrity": "sha512-F27Uw3MySeXh3CQF7ufdhujG9QqKlLIWUQ9EG0cSaddUCFVzqsPQ5lVV3aoqu9Z4hRuq0FZHtc/g4r6idnqnPA==",
-      "license": "MIT"
-    },
     "node_modules/remark": {
       "version": "15.0.1",
       "resolved": "https://registry.npmjs.org/remark/-/remark-15.0.1.tgz",