Cleanup: fix eslint warnings, button loading state, inspector footer hint

- app.js: replace != with !== (eqeqeq rule) on resolved_24h null check
  and totalActive pagination check
- style.css: extend loading state to all .lt-btn.is-loading (not just
  refresh button), so suppressions form submit shows disabled feedback;
  remove dead .link-collapse-bar rule
- base.html: add inspector page to footer R=REFRESH hint; update
  keyboard shortcut table to include Inspector in refresh shortcut doc

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

static/app.js

@@ -95,7 +95,7 @@ function updateStatusBar(summary, lastCheck, daemonOk) {
   const scRes  = document.getElementById('stat-resolved-val');
   if (scCrit) scCrit.textContent = critCount;
   if (scWarn) scWarn.textContent = warnCount;
-  if (scRes && summary.resolved_24h != null) scRes.textContent = summary.resolved_24h;
+  if (scRes && summary.resolved_24h !== null && summary.resolved_24h !== undefined) scRes.textContent = summary.resolved_24h;
   const statCritCard = document.getElementById('stat-critical');
   if (statCritCard) statCritCard.classList.toggle('lt-stat-card--alert', critCount > 0);
 
@@ -207,7 +207,7 @@ function updateEventsTable(events, totalActive) {
     return;
   }
 
-  const truncated = totalActive != null && totalActive > active.length;
+  const truncated = totalActive !== null && totalActive !== undefined && totalActive > active.length;
   const countNotice = truncated
     ? `<div class="pagination-notice">Showing ${active.length} of ${totalActive} active alerts &mdash; <a href="/api/events?limit=1000">view all via API</a></div>`
     : '';

static/style.css

@@ -83,13 +83,16 @@
   .lt-main.lt-container { padding-top: calc(46px + var(--space-sm)); }
 }
 
-/* ── Refresh button loading state ────────────────────────────────── */
-[data-action="refresh"].is-loading {
+/* ── Button loading state ─────────────────────────────────────────── */
+[data-action="refresh"].is-loading,
+.lt-btn.is-loading {
   opacity: .5;
   pointer-events: none;
   cursor: wait;
+  position: relative;
 }
-[data-action="refresh"].is-loading::after {
+[data-action="refresh"].is-loading::after,
+.lt-btn.is-loading::after {
   content: '…';
 }
 
@@ -587,7 +590,6 @@
 .panel-toggle   { font-size: .65em; color: var(--text-muted); flex-shrink: 0; margin-left: 6px; padding: 0 4px; border: 1px solid var(--border-color); }
 .link-host-panel.collapsed > .link-ifaces-grid { display: none; }
 
-.link-collapse-bar { display: flex; gap: 8px; margin-bottom: 10px; }
 
 .link-ifaces-grid {
   display: grid;

templates/base.html

@@ -210,7 +210,7 @@
         <span class="lt-footer-sep">|</span>
         <span class="lt-footer-hint"><span class="lt-footer-key">[ S ]</span> SUPPRESS</span>
         <span class="lt-footer-sep">|</span>
-      {% elif request.endpoint == 'links_page' %}
+      {% elif request.endpoint in ('links_page', 'inspector') %}
         <span class="lt-footer-hint"><span class="lt-footer-key">[ R ]</span> REFRESH</span>
         <span class="lt-footer-sep">|</span>
       {% endif %}
@@ -233,7 +233,7 @@
           <thead><tr><th>Shortcut</th><th>Action</th></tr></thead>
           <tbody>
             <tr><td>Ctrl / &#x2318; + K</td><td>Command palette</td></tr>
-            <tr><td>R</td><td>Refresh data (Dashboard / Link Debug)</td></tr>
+            <tr><td>R</td><td>Refresh data (Dashboard / Link Debug / Inspector)</td></tr>
             <tr><td>S</td><td>Quick-suppress alert (Dashboard)</td></tr>
             <tr><td>*</td><td>Open settings</td></tr>
             <tr><td>?</td><td>Show this help</td></tr>