feat(ios): improve share extension UX and fix image reload issues

Improve iOS share extension implementation to skip interstitial UI and
fix issues with subsequent image shares not updating the view.

iOS Share Extension Improvements:
- Replace SLComposeServiceViewController with custom UIViewController
  to eliminate interstitial "Post" button UI
- Use minimal URL (timesafari://) instead of deep link for app launch
- Implement app lifecycle detection via Capacitor appStateChange listener
  instead of relying solely on deep links

Deep Link and Navigation Fixes:
- Remove "shared-photo" from deep link schemas (no longer needed)
- Add empty path URL handling for share extension launches
- Implement processing lock to prevent duplicate image processing
- Add retry mechanism (300ms delay) to handle race conditions with
  AppDelegate writing temp files
- Use router.replace() when already on /shared-photo route to force refresh
- Clear old images from temp DB before storing new ones
- Delete temp file immediately after reading to prevent stale data

SharedPhotoView Component:
- Add route watcher (@Watch) to reload image when fileName query
  parameter changes
- Extract image loading logic into reusable loadSharedImage() method
- Improve error handling to clear image state on failures

This fixes the issue where sharing a second image while already on
SharedPhotoView would display the previous image instead of the new one.

src/interfaces/deepLinks.ts

@@ -68,7 +68,6 @@ export const deepLinkPathSchemas = {
   "user-profile": z.object({
     id: z.string(),
   }),
-  "shared-photo": z.object({}),
 };
 
 export const deepLinkQuerySchemas = {