feat: rename /connect-chrome → /open-gstack-browser across all references

Update README skill lists, docs/skills.md deep dive, extension sidepanel
banner copy button, and reconnect clipboard text.

extension/sidepanel.html

@@ -10,7 +10,7 @@
     <span class="conn-banner-text" id="conn-banner-text">Reconnecting...</span>
     <div class="conn-banner-actions" id="conn-banner-actions" style="display:none">
       <button class="conn-btn" id="conn-reconnect">Reconnect</button>
-      <button class="conn-btn conn-copy" id="conn-copy" title="Copy command">/connect-chrome</button>
+      <button class="conn-btn conn-copy" id="conn-copy" title="Copy command">/open-gstack-browser</button>
     </div>
   </div>
 

extension/sidepanel.js

@@ -1379,10 +1379,10 @@ document.getElementById('conn-reconnect').addEventListener('click', () => {
 });
 
 document.getElementById('conn-copy').addEventListener('click', () => {
-  navigator.clipboard.writeText('/connect-chrome').then(() => {
+  navigator.clipboard.writeText('/open-gstack-browser').then(() => {
     const btn = document.getElementById('conn-copy');
     btn.textContent = 'copied!';
-    setTimeout(() => { btn.textContent = '/connect-chrome'; }, 2000);
+    setTimeout(() => { btn.textContent = '/open-gstack-browser'; }, 2000);
   });
 });