Some terminal emulators (macOS Terminal.app, Windows ConHost) briefly report stale dimensions via `crossterm::terminal::size()` after a resize. ratatui's `draw()` calls `autoresize()` internally, queries the backend, and shrinks the viewport back to the stale dimension — leaving the newly-expanded area filled with stale content from the previous frame (the duplicate-panel symptom users have reported).
The fix adds `force_size` / `clear_forced_size` to `ColorCompatBackend` and forces the resize-event size for the post-resize draw, then clears the forcing for subsequent frames. Same class of fix as #582 but covers an additional emulator family.
Thanks to @ArronAI007 for tracking down the autoresize→stale-size→short-buffer interaction.
Arron
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