chore(mobile): bump versions for native release

[dylanjeffers]

Summary

The react-native-screens patch from #14601, which fixes diagonal scrolls on nested screens, is native and can't ship over OTA. mobile.yml only runs the RC and production native builds when packages/mobile/package.json's version changes, so no binary has it yet.

• packages/mobile/package.json: 1.5.185 → 1.5.186
• iOS CFBundleShortVersionString: 1.1.198 → 1.1.199. The 2026-08-28 production upload was rejected because 1.1.198 wasn't higher than the version already on the App Store.
• Android versionName: 1.1.534 → 1.1.535
• Removes the unused Fabric gradle plugin and its repo. maven.fabric.io now returns 403, and resolving io.fabric.tools:gradle:1.31.2 failed both Android builds in run 33198553014. Nothing applies the plugin.

Before merging

This changes the OTA routing key. After merge, OTAs publish to 1.5.186 histories, and devices on the current 1.5.185 store build stop getting them until they update. Run a production OTA dispatch from main before merging, so 1.5.185 users get everything since 2026-09-13 (including the JS half of #14601):

gh workflow run mobile.yml --repo AudiusProject/apps --ref main -f ota_channel=production

After merging

The merge push should run iOS RC, Android RC, iOS production and Android production builds. The RC builds go to TestFlight / the RC Play track. Production builds upload without submitting.

🤖 Generated with Claude Code

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