fix(mobile): clamp main scrollers — WebKit pans pre-transform overflow#131
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…-transform overflow The user's screen recording showed the real failure: on iOS the content area itself pans sideways and rubber-bands back. WebKit counts the focus rotary's pre-transform 540px stage as scrollable overflow (Chromium uses the post-transform size, which is why emulation missed it), giving the main scroller ~150px of horizontal scroll on a phone. overflow-x-hidden on the app's main scrollers makes sideways panning impossible app-wide. Verified on Playwright WebKit (iPhone 13 viewport): scrollLeft is pinned to 0. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Follow-up to #130, which was merged before this commit landed on the branch — this is the half that fixes the behavior in the screen recording.
On iOS the content area itself pans ~150px sideways and rubber-bands back. Root cause: WebKit counts the Focus rotary's pre-transform 540px stage as scrollable overflow (Chromium uses the post-transform size, which is why the original emulator check missed it). #130's overscroll/touch-action work doesn't stop it because it's real horizontal scroll, not bounce.
overflow-x-hiddenon the app's main scrollers (AppShell,DashboardPage) makes sideways panning impossible app-wide; deliberate horizontal scrollers (upcoming-covers strip, timeline ribbon) are their own scroll containers and keep working.Verified on Playwright WebKit (iPhone 13 viewport):
main.scrollLeft = 200pins back to 0. Frontend build clean.