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Rebuilding an unchanged message footer currently schedules another layout even when its overlap value is identical. Only invalidate footer layout when that value changes, preserving layout updates for actual geometry changes. ### Stable release recommendation Exclude from `mobile-release/conference-2026-10`; defer to the following release. The regression test demonstrates eliminated redundant layout, but the effect on navigation latency has not been quantified. ### Validation The added widget regression checks that unchanged footer rebuilds do not repeat layout and changed overlap still updates geometry. The independent footer build passes the full mobile suite, analysis, and native iOS Simulator build. Channel scrolling, opening an existing reaction list, and thread navigation were exercised on iOS 26.5 Simulator. The full local repository gate previously encountered an unrelated, unchanged desktop subprocess timing test failure; that test passed in isolation. All PR CI checks pass, including the native iOS suite. <!-- buzz-review-completed --> Signed-off-by: Tom Brow <tomb@block.xyz>