feat(ui): zh chrome — new tabs and project switcher translated

The Atlas program added seven tabs of hardcoded English on top of an
en/zh UI. This translates the shell (tab labels, switcher strings)
so zh users get a coherent frame; panel-content i18n is a dedicated
follow-up pass, recorded.

Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>

graph-ui/src/App.tsx

@@ -144,12 +144,12 @@ export function App() {
    * App-level destinations (Projects, Control) live on the right instead of
    * being mixed into this row as dead buttons. */
   const projectTabs: { id: TabId; label: string }[] = [
-    { id: "overview", label: "Overview" },
-    { id: "modules", label: "Modules" },
-    { id: "graph", label: "Galaxy" },
-    { id: "flows", label: "Flows" },
-    { id: "changes", label: "Changes" },
-    { id: "dashboard", label: "Dashboard" },
+    { id: "overview", label: t.tabs.overview },
+    { id: "modules", label: t.tabs.modules },
+    { id: "graph", label: t.tabs.graph },
+    { id: "flows", label: t.tabs.flows },
+    { id: "changes", label: t.tabs.changes },
+    { id: "dashboard", label: t.tabs.dashboard },
   ];
 
   const symbolRef = route.sym
@@ -174,6 +174,7 @@ export function App() {
             {/* Context first: which project is everything below about? */}
             <ProjectSwitcher
               selected={selectedProject}
+              labels={t.switcher}
               allProjectsLabel={t.tabs.projects}
               onSelect={(project) => navigate({ tab: "overview", project })}
               onAllProjects={() => navigate({ tab: "stats", project: null })}

graph-ui/src/components/ProjectSwitcher.tsx

@@ -8,11 +8,13 @@ import type { Project } from "../lib/types";
  * of dead tabs. */
 export function ProjectSwitcher({
   selected,
+  labels,
   allProjectsLabel,
   onSelect,
   onAllProjects,
 }: {
   selected: string | null;
+  labels: { select: string; search: string; manage: string };
   allProjectsLabel: string;
   onSelect: (project: string) => void;
   onAllProjects: () => void;
@@ -73,7 +75,7 @@ export function ProjectSwitcher({
         }`}
         title={selected ?? "Choose which indexed project to explore"}
       >
-        <span className="font-mono truncate">{selected ?? "Select a project…"}</span>
+        <span className="font-mono truncate">{selected ?? labels.select}</span>
         <span className="text-foreground/40 text-[11px] shrink-0">▾</span>
       </button>
       {open &&
@@ -105,7 +107,7 @@ export function ProjectSwitcher({
                     onSelect(filtered[0].name);
                   }
                 }}
-                placeholder="Search projects…"
+                placeholder={labels.search}
                 className="w-full bg-background border border-border/60 rounded-md px-2.5 py-1.5 text-[13px] text-foreground placeholder-foreground/35 outline-none focus:border-primary/60 transition-all"
               />
             </div>
@@ -144,7 +146,7 @@ export function ProjectSwitcher({
                   }}
                   className="w-full text-left px-3 py-1.5 text-[13px] text-foreground/55 hover:text-foreground/85 hover:bg-surface-4 transition-colors"
                 >
-                  {allProjectsLabel} — manage &amp; index →
+                  {allProjectsLabel} — {labels.manage} →
                 </button>
               </div>
             </div>

graph-ui/src/lib/i18n.ts

@@ -5,10 +5,20 @@ export type UiLanguage = "en" | "zh";
 export const messages = {
   en: {
     tabs: {
-      graph: "Graph",
+      overview: "Overview",
+      modules: "Modules",
+      graph: "Galaxy",
+      flows: "Flows",
+      changes: "Changes",
+      dashboard: "Dashboard",
       projects: "Projects",
       control: "Control",
     },
+    switcher: {
+      select: "Select a project…",
+      search: "Search projects…",
+      manage: "manage & index",
+    },
     common: {
       cancel: "Cancel",
       refresh: "Refresh",
@@ -76,10 +86,20 @@ export const messages = {
   },
   zh: {
     tabs: {
-      graph: "图谱",
+      overview: "总览",
+      modules: "模块",
+      graph: "星系",
+      flows: "流程",
+      changes: "变更",
+      dashboard: "仪表盘",
       projects: "项目",
       control: "控制",
     },
+    switcher: {
+      select: "选择项目…",
+      search: "搜索项目…",
+      manage: "管理与索引",
+    },
     common: {
       cancel: "取消",
       refresh: "刷新",