fix: update PostHog to 3.62.0 to fix SwiftDriver compilation error

- Pin PostHog to 3.62.0 (vendored PLCrashReporter, drops external
  plcrashreporter dependency that fails with Xcode 26/Swift 6)
- Update project.yml and pbxproj minimumVersion
- Delete Package.resolved to force clean SPM resolution
- Add -resolvePackageDependencies step in CI workflow
- Add -skipPackagePluginValidation to build command
- Fix docs/ci-cd-setup.md manual build command

docs/ci-cd-setup.md

@@ -94,11 +94,13 @@ cd tabatago-swift
 xcodegen generate
 xcodebuild build \
   -project TabataGo.xcodeproj \
-  -scheme TabataGo \
+  -target TabataGo \
   -sdk iphoneos \
+  -destination "generic/platform=iOS" \
   -configuration Release \
-  CODE_SIGN_STYLE=Automatic \
-  -allowProvisioningUpdates
+  -allowProvisioningUpdates \
+  -skipPackagePluginValidation \
+  CODE_SIGN_STYLE=Automatic
 ```
 
 ## 6. Firebase App Distribution Setup