feat(cli): TUI grid threshold, narrow agents view, new-task popup, browser launch

- Lower the multi-panel grid threshold from 100×24 to 80×20 so standard
  terminals render the full layout instead of falling back to single-pane.
- Agents view stacks list above detail when cols < 80; Tab focus model
  preserved.
- Board view: press [n] to open a centered create-task popup. Title is
  edited via ink-text-input; submit calls TaskStore.createTask, refresh
  the task list on success.
- System panel: shows the tokenized auth URL alongside the token, says
  "no auth" plainly when --no-auth was used, and prompts with
  "Press [Enter] to open in browser". Enter (while System is focused)
  spawns the platform's URL opener (open / start / xdg-open).
- Tighten log-row layout: each row is now a single Text with inline
  spans + fixed-width prefix slot so columns align and the highlight
  bar spans the full row.
- Default status section is "logs" so the live feed is what users see
  when they run `fn`.
- Drop the ASCII circle brand mark from the splash; FUSION block
  letters + tagline + spinner only, pinned to the top-left.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/cli/src/commands/dashboard.ts

@@ -1546,6 +1546,25 @@ export async function runDashboard(port: number, opts: { paused?: boolean; dev?:
               agentState: (t as { agentState?: string }).agentState,
             }));
           },
+          createTask: async (projectPath: string, input: { title: string; description?: string }) => {
+            let projectStore = projectStores.get(projectPath);
+            if (!projectStore) {
+              projectStore = projectPath === cwd ? store : new TaskStore(projectPath);
+              if (projectPath !== cwd) await projectStore.init();
+              projectStores.set(projectPath, projectStore);
+            }
+            const created = await projectStore.createTask({
+              title: input.title,
+              description: input.description ?? input.title,
+            });
+            return {
+              id: created.id,
+              title: created.title,
+              description: created.description ?? "",
+              column: created.column,
+              agentState: (created as { agentState?: string }).agentState,
+            };
+          },
           listAgents: async () => {
             const list = await agentStore!.listAgents();
             return list.map((a) => ({