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gsxdsm 602fefff19 FN-6498: smooth mobile quick chat viewport tracking

Keep the mobile Quick Chat sheet aligned with visualViewport changes without redundant layout writes.

- Dedupe repeated mobile visualViewport samples before updating sheet CSS variables.
- Reset viewport tracking state and CSS variables on close/unmount to prevent stale reopen sizing.
- Add regression coverage for mobile tracking, reopen behavior, desktop bypass, and missing visualViewport fallback.
- Document the viewport-smoothing pitfall alongside the keyboard board-shift solution.

Files changed:
 .../quick-chat-mobile-keyboard-board-shift.md      |   4 +
 packages/dashboard/app/components/QuickChatFAB.tsx |  25 +++-
 .../app/components/__tests__/QuickChatFAB.test.tsx | 141 +++++++++++++++++++++
 3 files changed, 167 insertions(+), 3 deletions(-)

Fusion-Task-Id: FN-6498

Fusion-Task-Lineage: 23c17843-778a-4337-aeed-c80793615738

2026-06-16 21:25:39 -07:00