feat(extension): add popup status page (paired/not-paired) for Web Store review

The biggest Web Store rejection risk for a CLI-bridge extension is "non-functional
without external software." Give ab-connect a visible standalone UI: a branded
popup that shows whether the native-messaging link to the local agent-browser CLI
is live (Connected + attached tab count, or Not paired with the install hint),
plus a one-line privacy statement (no tracking, no remote server) and a repo link.

- manifest: action.default_popup = popup.html; bump 0.4.0 -> 0.4.1
- background.js: track hostConnected; respond to {type:'ab-status'} from the popup
  and nudge a reconnect on open
- popup.html/popup.js: dark/cyan branded status page (MV3-CSP-safe: external JS,
  no inline handlers), with a safety timeout so it never hangs on "Checking…"
- repacked ab-connect.zip/.crx

extensions/ab-connect/popup.js

@@ -0,0 +1,64 @@
+// Popup status page for agent-browser-stealth.
+// Asks the service worker whether the native-messaging link to the local
+// agent-browser CLI is live, and renders a paired / not-paired indicator.
+
+const dot = document.getElementById('dot')
+const label = document.getElementById('statusLabel')
+const sub = document.getElementById('statusSub')
+const hint = document.getElementById('hint')
+
+let resolved = false
+
+function render(state) {
+  resolved = true
+  const connected = !!(state && state.connected)
+  dot.classList.remove('on', 'off')
+  if (connected) {
+    dot.classList.add('on')
+    label.textContent = 'Connected'
+    const n = state.tabCount | 0
+    sub.textContent =
+      n > 0
+        ? `bridged to the local CLI · ${n} tab${n === 1 ? '' : 's'} attached`
+        : 'bridged to the local CLI · ready'
+    hint.style.display = 'none'
+  } else {
+    dot.classList.add('off')
+    label.textContent = 'Not paired'
+    sub.textContent = 'no local agent-browser CLI linked'
+    hint.style.display = 'block'
+  }
+}
+
+function queryStatus() {
+  try {
+    chrome.runtime.sendMessage({ type: 'ab-status' }, (resp) => {
+      // lastError fires if the service worker can't be reached.
+      if (chrome.runtime.lastError) {
+        render({ connected: false })
+        return
+      }
+      render(resp)
+    })
+  } catch (e) {
+    render({ connected: false })
+  }
+}
+
+// Open the repo in a real tab (no inline handlers under MV3 CSP).
+const repo = document.getElementById('repo')
+if (repo) {
+  repo.addEventListener('click', () => {
+    chrome.tabs.create({ url: repo.dataset.href })
+  })
+}
+
+// Query now, then once more shortly after — opening the popup also nudges the
+// service worker to (re)connect the host, which may complete a beat later.
+queryStatus()
+setTimeout(queryStatus, 700)
+
+// Never leave the popup stuck on "Checking…" if the worker never answers.
+setTimeout(() => {
+  if (!resolved) render({ connected: false })
+}, 1500)