Merge the final checkup's fixes into the 1.40.0 release

From the read-only final review of the release, adversarially verified, then reviewed again:
- tiles: a file dropped on the grid uploads to that tile's session instead of navigating away; app-driven tile changes no longer move the keyboard into another session; popping out the last tile no longer leaves a frozen view; "Open group as tiles" no longer merges an open split; the Tiles button defaults off on touch tablets (opt-in)
- voice: dictation with the grid open reaches the focused tile
- css: By case stays one scrolling strip on 600-767px tablets, the needs-you pulse animates opacity only, phone welcome chips are 40px
- i18n: zh-CN for the case picker rows, the git status settings, new toasts, tile and spreadsheet texts
- cli registry: codex launch defaults are registry data, not an id branch; the codex footer reads an ultra effort
- build and docs: a dependency preflight runs before the build deletes dist; docs no longer name 1.36.0

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

test/mocks/tile-grid-vm.ts

@@ -375,6 +375,10 @@ export function resetGridHarness() {
   // The CLI catalog the server injects (labels for the harness logos); a test sets its own.
   delete windowStub.__codemanCliCatalog;
   section.children = [];
+  // The grid binds its file-drop guard on the section once per app; an earlier
+  // test's app must not still be listening there.
+  section.listeners = {};
+  section.captureFlags = {};
   main.className = 'main';
   // A split a test left open moved .terminal-wrap into its container, with
   // Pane A's header strip in it.