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Fusion Agent 89427dab11 FN-076: disable chat textarea mouse resizing

Disable mouse-driven composer resizing while preserving automatic five-line sizing across chat surfaces.

- Remove pointer-based manual resize handling and related CSS affordances.
- Apply consistent autosizing and shrink-to-minimum behavior to all chat composers.
- Update regression coverage, documentation, and the published package changeset.

Files changed:
 .changeset/fn-076-removal.md                       |   7 ++
 docs/dashboard-guide.md                            |   6 +-
 .../app/components/ChatQuestionResponse.css        |   4 +-
 .../app/components/ChatQuestionResponse.tsx        |  23 ++--
 packages/dashboard/app/components/ChatView.css     |   8 +-
 packages/dashboard/app/components/ChatView.tsx     |  18 +--
 .../dashboard/app/components/ComposeChatPanel.css  |   4 +-
 .../dashboard/app/components/ComposeChatPanel.tsx  |  20 +++-
 .../app/components/StandardChatSurface.tsx         |  20 +++-
 packages/dashboard/app/components/TaskChatTab.css  |   4 +-
 packages/dashboard/app/components/TaskChatTab.tsx  |  12 +-
 .../app/components/TaskPlannerChatTab.css          |   4 +-
 .../app/components/TaskPlannerChatTab.tsx          |   8 +-
 .../__tests__/ChatQuestionResponse.test.tsx        |  38 ++++++
 .../__tests__/ChatView.autosize.test.tsx           |  26 ++--
 .../ChatView.chat-input-autosize.test.tsx          |  61 ++--------
 .../__tests__/ChatView.message-edit.test.tsx       |  10 ++
 .../components/__tests__/ComposeChatPanel.test.tsx |  25 ++++
 .../app/components/__tests__/TaskChatTab.test.tsx  |  13 +-
 .../__tests__/TaskPlannerChatTab.test.tsx          |  13 +-
 packages/dashboard/app/utils/chatInputAutosize.ts  | 132 ++-------------------
 21 files changed, 195 insertions(+), 261 deletions(-)

Fusion-Task-Id: FN-076
Fusion-Task-Lineage: d4580427-640b-41c1-b5d1-837da43c7438
Co-authored-by: Fusion <noreply@runfusion.ai>

2026-08-21 04:32:53 +00:00