feat(photos): downloaded media also lands in a "Connect" album in Photos

The Files folder is the app's own copy — it powers offline playback and Manage
storage — but Files is not where anyone looks for photos and videos. The Photos app
is, and only PhotoKit can write there; @capacitor/filesystem cannot, because an
app sandbox and the photo library are separate stores. So this adds a small native
plugin, mirroring the existing audio-route one.

- mobile/plugins/media-library: saveToAlbum({path, album, kind}) finds or creates
  the album and adds the asset. Uses addResource(with:fileURL:), which is uniform
  for photo and video and non-optional, unlike creationRequestForAssetFrom*, which
  can silently no-op.
- Requests .readWrite, NOT .addOnly: addOnly can add an asset but cannot look up or
  create an ALBUM, which is the whole point here. Both photo-library usage strings
  are already set by ios-patch.sh.
- If the album can't be resolved (e.g. "limited" access), the asset is still saved
  to the camera roll — landing somewhere beats failing outright. A racing create
  from two simultaneous downloads re-looks-up instead of erroring.
- Podspec named MediaLibrary.podspec with s.name = 'MediaLibrary' to match
  PascalCase of the package name — the same trap that broke the AudioRoute build.
  Checked by a script: pod name, jsName and declared-vs-implemented methods.

Entirely best-effort from the web side: a denied permission or an older app build
never fails a download that is already safe in the app folder. Added a Settings
toggle since this does keep a second copy of the file.

Needs a new iOS build — new native plugin.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

mobile/plugins/media-library/package.json

@@ -0,0 +1,26 @@
+{
+  "name": "media-library",
+  "version": "1.0.0",
+  "description": "Save downloaded photos & videos into a named Photos album for Biz Connect",
+  "main": "dist/plugin.cjs.js",
+  "module": "dist/esm/index.js",
+  "types": "dist/esm/index.d.ts",
+  "author": "BizGaze",
+  "license": "MIT",
+  "files": [
+    "dist/",
+    "ios/",
+    "MediaLibrary.podspec"
+  ],
+  "capacitor": {
+    "ios": {
+      "src": "ios"
+    }
+  },
+  "devDependencies": {
+    "@capacitor/core": "^7.0.0"
+  },
+  "peerDependencies": {
+    "@capacitor/core": "^7.0.0"
+  }
+}