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Fusion Agent c3aeff5ff1 FN-048: resize chat composers from the top edge and collapse stale heights

Resize shared chat composers around a top-edge drag model and clear manual heights when drafts shrink.

- Replace native textarea resizing with desktop/tablet top-edge pointer resizing.
- Collapse stale manual heights back to automatic sizing for shorter drafts.
- Update composer styles, regression coverage, and the published patch changeset.

Files changed:
 .changeset/fn-048-chat-composer-resize.md          |  7 ++
 packages/dashboard/app/components/ChatView.css     |  6 +-
 packages/dashboard/app/components/TaskChatTab.css  |  6 +-
 .../app/components/TaskPlannerChatTab.css          |  6 +-
 .../__tests__/ChatView.autosize.test.tsx           | 54 ++++++++++--
 .../ChatView.chat-input-autosize.test.tsx          | 80 +++++++++++++-----
 .../app/components/__tests__/TaskChatTab.test.tsx  | 24 ++++--
 .../__tests__/TaskPlannerChatTab.test.tsx          | 24 ++++--
 packages/dashboard/app/utils/chatInputAutosize.ts  | 96 ++++++++++++++++------
 9 files changed, 223 insertions(+), 80 deletions(-)

Fusion-Task-Id: FN-048

Fusion-Task-Lineage: 83d573b2-fdaa-48bb-906a-c1e0b074539f

Co-authored-by: Fusion <noreply@runfusion.ai>

2026-08-20 03:57:23 +00:00