feat(ui): IDEA-style message dialogs, project widget popup and Chinese UI text

Message dialogs: `Dialog` gets an `icon` (question / info / warning / error)
that renders IDEA's alert layout: no title bar, a 32px icon, bold title,
text, checkbox under it. Every confirmation helper (prompt, VCS, services,
project tree, keymap, LSP choices, run, database, Replace All) uses it. Open
Project matches IDEA: "This Window" is the default and has focus. The Code
Analysis and TODO commit checks default to Review.

Project widget: the title bar project button opens a popup like IDEA's
ProjectWidget, with Open… / Clone Repository…, the projects open in other
windows (new `window_open_projects` command) and recent projects, filtered by
typing.

Chinese UI: UI text stays written in English and is translated through a
source-text catalog (`locales/text/zh.json`, about 2300 strings). The UI
primitives (buttons, checkboxes, selects, tabs, dialogs, menus, tooltips,
toasts, settings labels and hints) translate the strings they are given.
Action titles and categories are localised in the registry, and static JSX
text uses `<T>`, so text follows a locale switch without a reload. The
Settings window now syncs the locale too. Settings search matches both
languages.

Claude-Session: https://claude.ai/code/session_01B65qLEKnkeYTGdbwhLpjCu

src/features/http-client/HttpClientView.tsx

@@ -6,7 +6,7 @@
 import { useEffect, useMemo, useState } from "react";
 import clsx from "clsx";
 import type { HttpExchange, HttpHistoryEntry } from "@/platform/ipc";
-import { EmptyState, IconButton, SplitGroup, SplitHandle, SplitPanel, Spinner, Tabs } from "@/ui";
+import { EmptyState, IconButton, SplitGroup, SplitHandle, SplitPanel, Spinner, Tabs, T } from "@/ui";
 import { bodyKind, formatMs, formatSize, prettyBody } from "./format";
 import { cancelRunning, clearHistory, refreshHistory, selectEntry, useHttpClient } from "./store";
 import styles from "./HttpClient.module.css";
@@ -98,7 +98,9 @@ function ExchangeView({ ex }: { ex: HttpExchange }) {
           ) : (
             <pre className={styles.pre} aria-label="Response body">
               {body}
-              {r.truncated && <span className={styles.truncated}>{`\n… truncated (${formatSize(r.size)} received)`}</span>}
+              {r.truncated && (
+                <span className={styles.truncated}>{`\n… truncated (${formatSize(r.size)} received)`}</span>
+              )}
             </pre>
           ))}
         {tab === "headers" && r && <HeaderTable headers={r.headers} />}
@@ -147,7 +149,9 @@ export function HttpClientView() {
             </div>
           )}
           {history.length === 0 && !running ? (
-            <EmptyState title="No requests yet">Run a request from an .http file with the gutter ▶ or ⌘↩.</EmptyState>
+            <EmptyState title="No requests yet">
+              <T>Run a request from an .http file with the gutter ▶ or ⌘↩.</T>
+            </EmptyState>
           ) : (
             history.map((h) => <EntryRow key={h.id} entry={h} selected={h.id === selected} />)
           )}