fix: add Reset Everything button + improve reveal mode reliability

Storage issue: Chromium/Brave keeps storage.local data even when
an unpacked extension is removed and reloaded. Added "Reset
Everything" button in Options → Danger Zone that clears all data
(double-confirm to prevent accidents).

Reveal mode: Now re-runs revealAllResponses() every 2 seconds
while active to catch streamed content and dynamically loaded
responses. Adds console logging for reveal toggle state changes
to aid debugging. Cleans up interval when reveal mode is turned off.

https://claude.ai/code/session_01Dvgwe7XMoSxnWXkih8p1Cw

src/content/content.js

@@ -740,24 +740,32 @@
 
   // React to reveal mode toggle
   let prevRevealMode = settings.revealMode;
+  let revealInterval = null;
+
   function checkRevealToggle() {
     if (settings.revealMode && !prevRevealMode) {
       // Just turned ON — reveal everything existing
+      console.log('[Silent Send] Reveal mode ON');
       revealAllResponses();
+      // Keep re-revealing periodically to catch new/streamed content
+      revealInterval = setInterval(() => {
+        if (settings.revealMode) revealAllResponses();
+      }, 2000);
     } else if (!settings.revealMode && prevRevealMode) {
       // Just turned OFF — restore originals
+      console.log('[Silent Send] Reveal mode OFF');
+      if (revealInterval) { clearInterval(revealInterval); revealInterval = null; }
       unrevealAllResponses();
     }
     prevRevealMode = settings.revealMode;
   }
 
   // Hook into config updates to detect reveal toggle
-  const origMessageHandler = window.addEventListener;
   window.addEventListener('message', (event) => {
     if (event.source !== window) return;
     if (event.data?.type === 'ss:config-updated') {
       // Settings were updated — check if reveal mode changed
-      setTimeout(checkRevealToggle, 50);
+      setTimeout(checkRevealToggle, 100);
     }
   });