Bind the task panel toggle to Alt+T

The palette was the toggle's only entry point, so removing it would have
taken the panel's visibility control with it. Alt+T sits alongside the
other panel and mode chords, and the keymap row is exercised by the
shortcut suite, so a binding that stops working fails rather than being
read by an operator who then finds it does nothing.

Author: TheGreatAxios

src/tui-opentui/keybindings.test.ts

@@ -22,6 +22,7 @@ import { createHarness, withTestRenderer, type Harness } from "./harness.js"
 import { mountRunnerHost } from "./runner-host.js"
 import { openCommandSurface } from "./command-surfaces.js"
 import { focusOwner } from "./focus/focus-state.js"
+import { setChromeZones } from "./shell.js"
 import {
   appendStreamRow,
   createAppShell,
@@ -297,6 +298,17 @@ const PROBES: Readonly<Record<string, { readonly group: Group; readonly probe: P
       shell.mouseCapture = null
     },
   },
+  "Alt+T": {
+    group: "surfaces",
+    probe: ({ h, shell, chords }) => {
+      setChromeZones(shell, { task: [{ label: "a", status: "todo" }] })
+      expect(shell.taskBox.visible).toBe(true)
+      press(h, chords[0])
+      expect(shell.taskBox.visible).toBe(false)
+      press(h, chords[0])
+      expect(shell.taskBox.visible).toBe(true)
+    },
+  },
   "Alt+E": {
     group: "surfaces",
     probe: ({ h, shell, chords }) => {

src/tui-opentui/wave6.test.ts

@@ -19,7 +19,6 @@ import {
   openInsetOverlay,
   openPalette,
   replaceStreamRowAt,
-  runPaletteAction,
   setChromeZones,
   streamRowAt,
   streamRowCount,
@@ -593,25 +592,6 @@ describe("CL-5731: task list panel", () => {
     )
   })
 
-  test("the palette 'toggle_task' action drives the same toggle", async () => {
-    await withTestRenderer(
-      async (h) => {
-        const shell = createAppShell(h.renderer, {
-          terminal: { columns: 80, rows: 24 },
-          wireKeys: false,
-        })
-        try {
-          setChromeZones(shell, { task: [{ label: "a", status: "todo" }] })
-          expect(shell.taskBox.visible).toBe(true)
-          runPaletteAction(shell, "toggle_task")
-          expect(shell.taskBox.visible).toBe(false)
-        } finally {
-          shell.dispose()
-        }
-      },
-      { width: 80, height: 24 },
-    )
-  })
 })
 
 describe("Wave 6: keyboard copy path", () => {