feat(FN-2975): merge fusion/fn-2975

- Stabilize QuickChatFAB search refresh lifecycle to prevent redundant or stale queries (`useTasks.ts`, `QuickChatFAB.tsx`)
- Add unit tests for QuickChatFAB component and `useTasks` hook
- Refactor QuickChatFAB styles and component structure

Commits merged:
- feat(FN-2975): complete Step 2 — stabilize search refresh lifecycle
- feat(FN-2972): merge fusion/fn-2972

Files changed:
packages/dashboard/app/components/QuickChatFAB.css | 60 ++++++++++++++++----
 packages/dashboard/app/components/QuickChatFAB.tsx | 65 +++++++++++-----------
 .../app/components/__tests__/QuickChatFAB.test.tsx | 32 +++++++++++
 .../dashboard/app/hooks/__tests__/useTasks.test.ts | 48 ++++++++++++++++
 packages/dashboard/app/hooks/useTasks.ts           |  4 +-
 5 files changed, 165 insertions(+), 44 deletions(-)

Fusion-Task-Id: FN-2975

packages/dashboard/app/hooks/useTasks.ts

@@ -109,7 +109,7 @@ export function useTasks(options?: UseTasksOptions) {
   const refreshTasks = useCallback(async (options?: { clearOnError?: boolean; searchQueryOverride?: string; includeArchivedOverride?: boolean }) => {
     const requestVersion = ++fetchVersionRef.current;
     const requestProjectId = projectId; // Capture the projectId for this request
-    const query = options?.searchQueryOverride ?? searchQuery;
+    const query = options?.searchQueryOverride ?? searchQueryRef.current;
     const wantArchived = options?.includeArchivedOverride ?? includeArchivedRef.current;
 
     try {
@@ -132,7 +132,7 @@ export function useTasks(options?: UseTasksOptions) {
       }
       setTasks((current) => current);
     }
-  }, [projectId, searchQuery]);
+  }, [projectId]);
   refreshTasksRef.current = refreshTasks;
 
   /** Lazy-load archived tasks. Called by the Board when the archived column is first expanded. */