iOS: fix comment composer auto-closing when keyboard opens

[kubo6472]

Problem

On iOS, tapping the comment composer (or Reply) would briefly show the keyboard, then immediately dismiss it — making it impossible to type a comment.

Root cause

The floating comment input was only shown when GeometryReader reported portrait (width <= height). When the keyboard opens, the available view height shrinks enough that width exceeds height, so SwiftUI treated the layout as landscape, removed the TextField from the hierarchy, and focus was lost.

Fix

• Track device orientation (UIDevice.orientationDidChangeNotification) for landscape UI gating instead of geometry size
• Add .scrollDismissesKeyboard(.never) on the comments ScrollView so incidental scrolling doesn't dismiss the keyboard

Testing

Manual verification on iOS device/simulator:

1. Open a video post with comments
2. Tap the bottom comment field — keyboard should stay open
3. Tap Reply on a comment — keyboard should stay open with reply banner
4. Rotate to landscape — composer should still hide and fullscreen player should still engage

  

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