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/engine/src/scheduler.ts

@@ -253,7 +253,7 @@ export class Scheduler {
     for (const depId of task.dependencies) {
       const dep = allTasks.find((t) => t.id === depId);
       if (dep && dep.column === "in-review" && dep.worktree) {
-        return `fusion/${dep.id.toLowerCase()}`;
+        return `kb/${dep.id.toLowerCase()}`;
       }
     }
 
@@ -261,7 +261,7 @@ export class Scheduler {
     if (task.blockedBy) {
       const blocker = allTasks.find((t) => t.id === task.blockedBy);
       if (blocker && blocker.column === "in-review" && blocker.worktree) {
-        return `fusion/${blocker.id.toLowerCase()}`;
+        return `kb/${blocker.id.toLowerCase()}`;
       }
     }