Add Quick Look Preview and Thumbnail extensions for .casera files

- Add CaseraQLPreview extension to show custom preview with contractor
  details and import instructions when viewing .casera files
- Add CaseraQLThumbnail extension to display teal icon in Messages
  and Files app instead of generic white box
- Update UTExportedTypeDeclarations to conform to public.content
  for better system file type recognition

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

iosApp/iosApp/Info.plist

@@ -39,6 +39,8 @@
 	<array>
 		<string>remote-notification</string>
 	</array>
+	<key>LSSupportsOpeningDocumentsInPlace</key>
+	<false/>
 	<key>CFBundleDocumentTypes</key>
 	<array>
 		<dict>
@@ -63,9 +65,11 @@
 			<string>Casera Contractor</string>
 			<key>UTTypeConformsTo</key>
 			<array>
-				<string>public.json</string>
 				<string>public.data</string>
+				<string>public.content</string>
 			</array>
+			<key>UTTypeIconFiles</key>
+			<array/>
 			<key>UTTypeTagSpecification</key>
 			<dict>
 				<key>public.filename-extension</key>
@@ -73,7 +77,7 @@
 					<string>casera</string>
 				</array>
 				<key>public.mime-type</key>
-				<string>application/json</string>
+				<string>application/x-casera</string>
 			</dict>
 		</dict>
 	</array>