fix: prevent silent muting from hiding pager messages

The "Mute" button on pager cards persists muted addresses to
localStorage with no visible indicator, making it easy to
accidentally hide an address and forget about it. This caused
flag fragment messages on RIC 1337 to silently disappear.

- Add "X muted source(s) — Unmute All" indicator to sidebar
- Stop persisting hideToneOnly filter across sessions so the
  default (show all) always applies on page load
- Remove default checked state from Tone Only filter checkbox

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

templates/index.html

@@ -3663,7 +3663,11 @@
             const saved = localStorage.getItem('pagerFilters');
             if (saved) {
                 try {
-                    pagerFilters = JSON.parse(saved);
+                    const parsed = JSON.parse(saved);
+                    // Only persist keywords across sessions.
+                    // hideToneOnly defaults to false every session so users
+                    // always see the full traffic stream unless they opt-in.
+                    if (Array.isArray(parsed.keywords)) pagerFilters.keywords = parsed.keywords;
                 } catch (e) {
                     console.warn('Failed to load pager filters:', e);
                 }
@@ -3964,6 +3968,7 @@
 
             // Load pager message filters
             loadPagerFilters();
+            if (typeof SignalCards !== 'undefined') SignalCards.updateMutedIndicator();
 
             // Initialize dropdown nav active state
             updateDropdownActiveState();