feat: disable until configured + auto permission request for custom domains

Interception is now completely inactive until the user configures
at least one identity field or explicit mapping. Before that:
- Icon shows gray (unconfigured)
- No fetch/XHR hooks fire
- First-run banner tells user to set up

Custom domains: clicking "Add Domain" in Options now triggers
the browser's native permission prompt via permissions.request().
No more manual chrome://extensions site access step.

Icon states are now:
- Gray = unconfigured (nothing will happen)
- Black = active and protecting
- Blue = reveal mode on
- Red = manually disabled

https://claude.ai/code/session_01Dvgwe7XMoSxnWXkih8p1Cw

src/background/service-worker.js

@@ -264,9 +264,20 @@ function generateIcon(color, size) {
 }
 
 async function updateIcon(settings) {
+  // Check if identity is configured
+  const identity = await Storage.getIdentity();
+  const mappings = await Storage.getMappings();
+  const configured = mappings.length > 0 ||
+    (identity.emails || []).length > 0 ||
+    (identity.names || []).length > 0 ||
+    (identity.usernames || []).length > 0 ||
+    !!identity.catchAllEmail;
+
   let color;
   if (!settings.enabled) {
     color = '#dc2626'; // red — disabled
+  } else if (!configured) {
+    color = '#9ca3af'; // gray — not configured, effectively disabled
   } else if (settings.revealMode) {
     color = '#1d4ed8'; // blue — reveal mode
   } else {
@@ -285,10 +296,10 @@ async function updateIcon(settings) {
   }
 }
 
-// Update icon when settings change
+// Update icon when settings, identity, or mappings change
 api.storage.onChanged.addListener(async (changes) => {
-  if (changes.ss_settings) {
-    const settings = { ...(changes.ss_settings.newValue || {}) };
+  if (changes.ss_settings || changes.ss_identity || changes.ss_mappings) {
+    const settings = await Storage.getSettings();
     await updateIcon(settings);
   }
 });

src/content/content.js

@@ -446,12 +446,20 @@
   // ============================================================
   // Check if we have anything to substitute
   // ============================================================
-  function hasSubstitutions() {
+  // Check if the user has configured anything at all.
+  // If not, the extension is effectively disabled — no interception.
+  function isConfigured() {
     return mappings.length > 0 ||
       (identity.emails || []).length > 0 ||
       (identity.names || []).length > 0 ||
       (identity.usernames || []).length > 0 ||
-      (identity.phones || []).length > 0;
+      (identity.hostnames || []).length > 0 ||
+      (identity.phones || []).length > 0 ||
+      !!identity.catchAllEmail;
+  }
+
+  function hasSubstitutions() {
+    return isConfigured();
   }
 
   // ============================================================

src/options/options.html

@@ -121,7 +121,7 @@
         <button class="btn btn-primary" id="btnAddDomain">Add Domain</button>
       </div>
       <p class="section-desc" style="margin-top:8px;margin-bottom:0">
-        After adding a domain in Chrome, you also need to grant permission: <code>chrome://extensions/</code> → Silent Send → Details → Site access → add the domain.
+        When you click "Add Domain", your browser will ask you to confirm access. No extra steps needed.
       </p>
     </section>
 

src/options/options.js

@@ -1,4 +1,5 @@
 import Storage from '../lib/storage.js';
+import api from '../lib/browser-polyfill.js';
 
 let mappings = [];
 let settings = {};
@@ -206,6 +207,20 @@ async function addDomain() {
     return;
   }
 
+  // Request browser permission for this domain
+  try {
+    const granted = await api.permissions.request({
+      origins: [domain + '/*'],
+    });
+    if (!granted) {
+      alert('Permission denied. The extension needs access to this domain to work.');
+      return;
+    }
+  } catch (e) {
+    // Firefox or older Chrome may not support optional permissions this way
+    console.warn('[Silent Send] Could not request permission:', e);
+  }
+
   domains.push(domain);
   settings.customDomains = domains;
   await Storage.saveSettings({ customDomains: domains });