fix(ios): use build setting variables for version in Info.plist

The literal values in Info.plist were not being overridden by the
MARKETING_VERSION and CURRENT_PROJECT_VERSION xcodebuild flags.
Use $(MARKETING_VERSION) and $(CURRENT_PROJECT_VERSION) variable
references so CI can set the version from the git tag.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Claude

app/ios/FareBot/Info.plist

@@ -15,9 +15,9 @@
     <key>CFBundlePackageType</key>
     <string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
     <key>CFBundleShortVersionString</key>
-    <string>1.0</string>
+    <string>$(MARKETING_VERSION)</string>
     <key>CFBundleVersion</key>
-    <string>1</string>
+    <string>$(CURRENT_PROJECT_VERSION)</string>
     <key>LSRequiresIPhoneOS</key>
     <true/>
     <key>LSSupportsOpeningDocumentsInPlace</key>