Add local file open support and improve URL handling

Introduces a dialog to open local HTML files via Ctrl+O/Cmd+O, converting file paths to file:// URLs for navigation. Also improves input handling by stripping quotes and better detecting local file paths. Updates bookmarks and clears site history.

bookmarks.backup.json

@@ -1,8 +1,8 @@
 [
   {
-    "title": "Apple",
-    "url": "apple.com",
-    "icon": "data:image/svg+xml;utf8,%3Csvg%20role%3D%22img%22%20viewBox%3D%220%200%2024%2024%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20style%3D%22color%3A%20white%3B%22%3E%3Ctitle%3EApple%3C%2Ftitle%3E%3Cpath%20d%3D%22M12.152%206.896c-.948%200-2.415-1.078-3.96-1.04-2.04.027-3.91%201.183-4.961%203.014-2.117%203.675-.546%209.103%201.519%2012.09%201.013%201.454%202.208%203.09%203.792%203.039%201.52-.065%202.09-.987%203.935-.987%201.831%200%202.35.987%203.96.948%201.637-.026%202.676-1.48%203.676-2.948%201.156-1.688%201.636-3.325%201.662-3.415-.039-.013-3.182-1.221-3.22-4.857-.026-3.04%202.48-4.494%202.597-4.559-1.429-2.09-3.623-2.324-4.39-2.376-2-.156-3.675%201.09-4.61%201.09zM15.53%203.83c.843-1.012%201.4-2.427%201.245-3.83-1.207.052-2.662.805-3.532%201.818-.78.896-1.454%202.338-1.273%203.714%201.338.104%202.715-.688%203.559-1.701%22%2F%3E%3C%2Fsvg%3E",
+    "title": "Discord",
+    "url": "discord.gg",
+    "icon": "data:image/svg+xml;utf8,%3Csvg%20role%3D%22img%22%20viewBox%3D%220%200%2024%2024%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%3E%3Ctitle%3EDiscord%3C%2Ftitle%3E%3Cpath%20d%3D%22M20.317%204.3698a19.7913%2019.7913%200%2000-4.8851-1.5152.0741.0741%200%2000-.0785.0371c-.211.3753-.4447.8648-.6083%201.2495-1.8447-.2762-3.68-.2762-5.4868%200-.1636-.3933-.4058-.8742-.6177-1.2495a.077.077%200%2000-.0785-.037%2019.7363%2019.7363%200%2000-4.8852%201.515.0699.0699%200%2000-.0321.0277C.5334%209.0458-.319%2013.5799.0992%2018.0578a.0824.0824%200%2000.0312.0561c2.0528%201.5076%204.0413%202.4228%205.9929%203.0294a.0777.0777%200%2000.0842-.0276c.4616-.6304.8731-1.2952%201.226-1.9942a.076.076%200%2000-.0416-.1057c-.6528-.2476-1.2743-.5495-1.8722-.8923a.077.077%200%2001-.0076-.1277c.1258-.0943.2517-.1923.3718-.2914a.0743.0743%200%2001.0776-.0105c3.9278%201.7933%208.18%201.7933%2012.0614%200a.0739.0739%200%2001.0785.0095c.1202.099.246.1981.3728.2924a.077.077%200%2001-.0066.1276%2012.2986%2012.2986%200%2001-1.873.8914.0766.0766%200%2000-.0407.1067c.3604.698.7719%201.3628%201.225%201.9932a.076.076%200%2000.0842.0286c1.961-.6067%203.9495-1.5219%206.0023-3.0294a.077.077%200%2000.0313-.0552c.5004-5.177-.8382-9.6739-3.5485-13.6604a.061.061%200%2000-.0312-.0286zM8.02%2015.3312c-1.1825%200-2.1569-1.0857-2.1569-2.419%200-1.3332.9555-2.4189%202.157-2.4189%201.2108%200%202.1757%201.0952%202.1568%202.419%200%201.3332-.9555%202.4189-2.1569%202.4189zm7.9748%200c-1.1825%200-2.1569-1.0857-2.1569-2.419%200-1.3332.9554-2.4189%202.1569-2.4189%201.2108%200%202.1757%201.0952%202.1568%202.419%200%201.3332-.946%202.4189-2.1568%202.4189Z%22%2F%3E%3C%2Fsvg%3E",
     "iconSet": "simple"
   }
 ]