feat(KB-640): add role editing UI and restore KB task prefix

- Add inline role editing to AgentListModal with clickable role icons
- Add handleRoleChange and handleRoleKeyDown handlers for role updates
- Persist view toggle (board/list) with localStorage alongside role editing
- Restore task prefix from FN back to KB for generated task IDs
- Restore branch naming from fusion/ back to kb/ for task branches
- Update branch name references in executor, merger, scheduler, and CLI
- Add touch gesture detection support to TaskCard component
- Update worktree grouping labels to use KB prefix

packages/dashboard/src/routes.ts

@@ -3316,7 +3316,7 @@ export function createApiRoutes(store: TaskStore, options?: ServerOptions): Rout
       }
 
       // Determine branch name from task
-      const branchName = `fusion/${task.id.toLowerCase()}`;
+      const branchName = `kb/${task.id.toLowerCase()}`;
 
       // Get owner/repo from git remote or GITHUB_REPOSITORY env
       let owner: string;