Capacitor 8 upgrade — Step A (keep CocoaPods)

Bump to Capacitor 8 while staying on CocoaPods (decouples the major-version bump
from the SPM switch, per the verified plan). Changes:
- mobile/package.json: all @capacitor/* + @capacitor-community/safe-area + cli → ^8.0.0
  (safe-area 8.0.1 verified Cap 8 compatible; @capacitor/assets stays 3.x, version-agnostic).
- 4 local plugins: @capacitor/core peer/dev dep → ^8.0.0; podspec ios deployment_target 14→15.
- codemagic.yaml: node 20→22 (Cap 8 requires Node 22+); `cap add ios --packagemanager Cocoapods`
  (Cap 8 defaults to SPM — force CocoaPods); fail loudly if no Podfile is generated.
- add-share-extension.rb: fallback deployment target 14→15.
Requirements per the Cap 7→8 guide: Node 22+, Xcode 26+, iOS 15 min. capacitor.config has no
adjustMarginsForEdgeToEdge to remove. LiveKit git-pins + native calling unchanged.

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

codemagic.yaml

@@ -29,7 +29,7 @@ workflows:
         BUNDLE_ID: "com.bizgaze.connect"
         XCODE_WORKSPACE: "mobile/ios/App/App.xcworkspace"
         XCODE_SCHEME: "App"
-      node: 20
+      node: 22
       xcode: latest
       cocoapods: default
     scripts:
@@ -44,8 +44,13 @@ workflows:
         script: |
           cd mobile
           # `cap add ios` scaffolds ios/App; safe to re-run — it no-ops if it already exists.
-          if [ ! -d "ios" ]; then npx cap add ios; fi
+          # Capacitor 8 DEFAULTS to Swift Package Manager, but our whole iOS pipeline (LiveKit Podfile pins,
+          # share-extension injection, AppDelegate patches) is CocoaPods-based — so force CocoaPods.
+          if [ ! -d "ios" ]; then npx cap add ios --packagemanager Cocoapods; fi
           npx cap sync ios
+          # Fail LOUDLY if no Podfile was generated (flag ignored / SPM project) rather than fail later with a
+          # confusing error — the CocoaPods pipeline downstream needs ios/App/Podfile to exist.
+          test -f ios/App/Podfile || { echo "ERROR: no ios/App/Podfile — 'cap add' did not use CocoaPods"; exit 1; }
           # App icon + splash from resources/icon.png & resources/splash*.png (1024x1024 icon, 2732² splash).
           npx capacitor-assets generate --ios || echo "asset generation skipped"