SmarterTube 31.77-mobile-alpha4

Pre-beta1 maintenance release. Ships most of the beta1 touch-UX work plus the bug fixes from on-device testing. In-place upgrade over alpha2/alpha3 (same signing key).

Fixes (this release)

• About: real "Check for updates" — checks the latest GitHub release and tells you if you're up to date or behind, instead of just opening the page. Routed through the app's own network client for reliability. The duplicate TV-style About page has been removed from Settings; the in-app About screen (drawer → About SmarterTube) is now the single place.
• Home shelves — horizontal rows no longer snap back to the start on the first sideways swipe (or after navigating away and back).
• Sign-in — after signing in you now land on the Home feed instead of the Settings page; the redundant single-account picker is skipped, and momentary network blips during sign-in are retried automatically.

Also included (from beta1 work)

• Light / dark theme with an in-app Theme picker
• Pull-to-refresh on Home, Search, Channel and Channel-uploads
• Tablet layouts (wider grids + drawer on sw600dp screens)

Known issue

• Intermittent "Sign-in failed" / connection errors can still occur on some devices/networks (device-side DNS resolver hiccup). Mitigated here with auto-retry; tracked in #13.

Not yet in this release

• Native voice search (the remaining beta1 feature) — keyboard search only for now (#8).

Install

Most phones: arm64-v8a. Older 32-bit devices: armeabi-v7a. If unsure, use universal.