fix(mobile): show the correct build channel in Android's Threads page header

[PixPMusic]

Summary

• derive the Android Threads header pill from the configured mobile build variant
• show Dev for development builds, Nightly for preview builds, and Alpha for production builds
• align the branded header with the compact thread list
• inherit the iOS split-header stabilization and production store-capture harness from fix(mobile): restore iOS Threads branding #4862

Important

This PR is stacked on #4862 and should merge only after it.

Why

The Android Threads header currently hard-codes Alpha, so development and Nightly builds present the wrong channel. This reuses the resolver introduced by #4862 and keeps the branded mobile headers consistent without changing Android routing or accessibility semantics.

Before / After

Android development build

Before	After

The comparison uses the deterministic dark-mode Threads fixture with no popup.

Verification

• vp test run scripts/mobile-showcase.test.ts apps/mobile/src/lib/mobileBranding.test.ts apps/mobile/src/native/scrollEdgeEffects.test.ts - 27 tests passed
• vp run --filter @t3tools/mobile typecheck
• targeted formatting and git diff --check
• deterministic development build capture showing the aligned Dev pill on Android
• production Android APK built and launched as com.t3tools.t3code
• upload-ready 1080x1920 Google Play Threads capture validated with the Alpha pill and no reconnect state

Store upload assets remain generated, ignored workflow artifacts under artifacts/app-store/screenshots/; PR proof images are not committed.

Checklist

• This PR is small and focused
• I explained what changed and why
• I added regression coverage
• I included before/after UI evidence
• I kept this stacked only on the mutually compatible iOS proposal

Model: GPT-5.6 Sol | Harness: Codex in T3 Code

---

Note

Low Risk
UI-only label and padding changes in the Android home header; no routing, auth, or data handling.

Overview
The Android Threads header no longer always shows Alpha. It now uses resolveMobileStageLabel on Constants.expoConfig?.extra?.appVariant, so Dev, Nightly, and Alpha match the configured mobile build channel—the same mapping used elsewhere in mobile branding.

Horizontal padding on that header uses HOME_HORIZONTAL_INSET instead of Tailwind px-4, aligning the branded header with the compact thread list layout.

^{Reviewed by Cursor Bugbot for commit c5cf7c5. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Fix build channel label in Android Threads page header

Replaces the static "Alpha" badge in AndroidHomeHeader with a dynamic stageLabel derived from appVariant via resolveMobileStageLabel. Also switches horizontal padding from the fixed px-4 Tailwind class to HOME_HORIZONTAL_INSET for consistency with the rest of the layout.

^{Macroscope summarized c5cf7c5.}

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[macroscopeapp]

Approvability

Verdict: Approved c5cf7c5

This is a straightforward bug fix replacing a hardcoded 'Alpha' label with dynamic text using an existing utility function already used elsewhere in the codebase. The padding adjustment is a minor UI consistency change. Low risk with no behavioral side effects.

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[PixPMusic]

@macroscope-app please refresh the PR summary in the description markers.

[macroscopeapp]

Sorry, I'm unable to act on this request because you do not have permissions within this repository.

Dismissing prior approval to re-evaluate 8dc9b3b

[cursor]

Cursor Bugbot has reviewed your changes using high effort and found 1 potential issue.

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Dismissing prior approval to re-evaluate 9daca9b

Dismissing prior approval to re-evaluate c5cf7c5