feat(v0.3): M3 themes/font settings + M7 session dashboard

- M3: settings.ts (⚙ panel: dark/light/solarized theme + font size A-/A+),
  persisted to localStorage; terminal-session.applyTheme; TabApp.applySettings
  applies to all + new tabs
- M7: dashboard.ts (▦ overlay listing every tab with connection dot + folder +
  Claude status; click a row to focus; live re-render while open);
  TabApp.snapshot()/focusTab()
- Browser-verified: light theme renders + persists; dashboard lists tabs and
  focuses on click. 208 tests green, typechecks + build ok.

public/main.ts

@@ -15,6 +15,8 @@ import { mountKeybar } from './keybar.js'
 import { TabApp } from './tabs.js'
 import { mountSearch } from './search.js'
 import { mountQrConnect } from './qr.js'
+import { mountSettings, loadSettings, type Settings } from './settings.js'
+import { mountDashboard } from './dashboard.js'
 
 const paneHost = document.getElementById('term')
 const tabs = document.getElementById('tabs')
@@ -25,6 +27,10 @@ if (!toolbar) throw new Error('#toolbar element not found in DOM')
 
 const app = new TabApp(paneHost, tabs)
 
+// Apply saved theme/font (M3) to the restored tabs.
+let settings: Settings = loadSettings()
+app.applySettings(settings)
+
 // Key bar (mobile + desktop) sends to whichever tab is active.
 mountKeybar((data) => app.sendToActive(data))
 
@@ -33,6 +39,18 @@ mountSearch(toolbar, {
   find: (query, dir) => app.findInActive(query, dir),
   clear: () => app.clearActiveSearch(),
 })
+mountSettings(
+  toolbar,
+  () => settings,
+  (s) => {
+    settings = s
+    app.applySettings(s)
+  },
+)
+mountDashboard(toolbar, {
+  snapshot: () => app.snapshot(),
+  focus: (idx) => app.focusTab(idx),
+})
 mountQrConnect(toolbar)
 
 // PWA: register the service worker (installable + offline shell, M4).