fix(i18n): zh-CN for the Redraw toasts, and comments that named old defaults

Redraw (Ctrl+Shift+R and the header button) shows five literal toasts and a
size report on the main pane, a tile or the split's Pane B. None had a zh-CN
entry, including the two the final checkup's tile Redraw fix added, and
"Failed to restore terminal size" fell to the generic "Failed to" pattern,
which left English behind. They now translate, and the size report keeps its
numbers through a pattern rule. test/redraw-toast-i18n.test.ts reads the
toasts from restoreTerminalSize() itself, so a reworded one without an entry
fails.

Comments and docs that still described an older default:
- styles.css: the Tiles header button is no longer opt-in; it is on by default
  on desktop and off on phones and coarse-pointer tablets.
- terminal-ui.js: the desktop branch of getDefaultSettings is no longer always
  {}; what the comment needs is that it sets no copyStripMargin.
- docs/tile-grid-plan.md: the Tiles default bullet names the tablet default.
- docs/cli-registry.md: codex's footer is read in a two-row window since
  codex 0.162's hint row, not from its last row.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/web/public/i18n.js

@@ -155,6 +155,12 @@
     'Drop a tab or a tile here': '将标签页或窗格拖放到此处',
     // A file dropped on a tile (tile-grid.js) or the single view (image-input.js).
     'Only image files are supported': '仅支持图像文件',
+    // Redraw (Ctrl+Shift+R, terminal-ui.js restoreTerminalSize) on the main pane, a tile or Pane B.
+    'No active session': '没有活动会话',
+    'This session is sized by its own window': '此会话的尺寸由它自己的窗口决定',
+    'Terminal not connected: its size is sent when it reconnects': '终端未连接：重新连接后会发送其尺寸',
+    'Could not determine terminal size': '无法确定终端尺寸',
+    'Failed to restore terminal size': '恢复终端尺寸失败',
     // A tile header's tooltip while tiles can move (with the state above it: a pattern below).
     'Drag to move the tile': '拖动可移动窗格',
     'Resize tile columns': '调整窗格列宽',
@@ -1161,6 +1167,7 @@
       [/^Will create: (.+)$/, (_m, path) => `将创建：${path}`],
       // The spreadsheet preview: an HTTP status, and the notice bar's counts.
       [/^Spreadsheet preview failed \((\d+)\)$/, (_m, status) => `电子表格预览失败（${status}）`],
+      [/^Terminal restored to (\d+)x(\d+)$/, (_m, cols, rows) => `终端已恢复为 ${cols}x${rows}`],
       [/^View truncated to the first (\d+) cells$/, (_m, n) => `视图仅显示前 ${n} 个单元格`],
       [/^(\d+) unsupported number formats$/, (_m, n) => `${n} 种不支持的数字格式`],
       // Group names are user text: they pass through untranslated.

src/web/public/styles.css

@@ -2598,8 +2598,9 @@ html[data-tab-orientation='vertical'].tab-rail-compact
   display: none !important;
 }
 
-/* Tile grid header button: hidden by default (opt-in, `showTileGridButton`),
-   and hard-gated to desktop widths like Split (the backstop below). */
+/* Tile grid header button: shown unless `showTileGridButton` resolves off
+   (default ON on desktop, OFF on phones and on coarse-pointer tablets), and
+   hard-gated to desktop widths like Split (the backstop below). */
 .btn-tile-grid--hidden {
   display: none !important;
 }

src/web/public/terminal-ui.js

@@ -4903,8 +4903,9 @@ Object.assign(CodemanApp.prototype, {
    * settings save can forget to call, and the toggle takes effect on the next
    * selection instead of the next reload. ⚠️ The test is `!== false`, not
    * `=== true`: this one defaults ON, and the desktop branch of
-   * getDefaultSettings returns {} and leans on the read sites for defaults, so
-   * a device that has never opened App Settings has no stored value at all.
+   * getDefaultSettings sets no copyStripMargin and leans on the read sites for
+   * defaults, so a device that has never opened App Settings has no stored
+   * value at all.
    */
   _copyStripMarginEnabled() {
     try {