Adds a mobile-only Overview / Conversation / Reply / Act navigation rail to the Search Preview workflow, preserves drafts while navigating or advancing results, removes the large sticky action slab on phones, and retains compact safe-area result continuation. Includes behavioral controller coverage, 320px/390px rendered Chromium validation, offline bundle coverage, and the release browser gate.
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Closes #973
Adds a mobile-only Overview / Conversation / Reply / Act navigation rail to the Search Preview workflow, preserves drafts while navigating or advancing results, removes the large sticky action slab on phones, and retains compact safe-area result continuation. Includes behavioral controller coverage, 320px/390px rendered Chromium validation, offline bundle coverage, and the release browser gate.
Tests:
1845 passed, 1 skipped; release browser journeys:3 passed.