fix: diagnostic toggle hint, link_stats schema, pagination UX, rate-limit feedback

- inspector.html: collapsible section hint text now toggles between [expand]/[collapse] when clicked
- inspector.html: timeout and connection-loss during diagnostic poll now show a Retry button instead of a dead end
- inspector.html: 429 rate-limit response shows a clear human-readable message instead of generic error
- app.py: empty link_stats fallback now includes unifi_switches:{} for schema consistency with real data shape
- index.html: pagination overflow notice now says "export all as JSON" (opens in new tab) instead of misleadingly linking to raw API as navigation

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

app.py

@@ -291,7 +291,7 @@ def api_links():
             return jsonify(json.loads(raw))
         except Exception as e:
             logger.error(f'Failed to parse link_stats JSON: {e}')
-    return jsonify({'hosts': {}, 'updated': None})
+    return jsonify({'hosts': {}, 'unifi_switches': {}, 'updated': None})
 
 
 @app.route('/api/events')

templates/index.html

@@ -92,7 +92,7 @@
     <div id="events-table-wrap">
     {% if events %}
     {% if total_active is defined and total_active > events|length %}
-    <div class="pagination-notice">Showing {{ events|length }} of {{ total_active }} active alerts &mdash; <a href="/api/events?limit=1000">view all via API</a></div>
+    <div class="pagination-notice">Showing {{ events|length }} of {{ total_active }} active alerts — use the search box to filter, or <a href="/api/events?limit=1000" target="_blank" rel="noopener">export all as JSON</a></div>
     {% endif %}
     <div class="lt-table-wrap">
       <table class="lt-table" id="events-table">

templates/inspector.html

@@ -487,7 +487,13 @@ document.addEventListener('click', e => {
   if (diagBtn) { runDiagnostic(diagBtn.dataset.sw, parseInt(diagBtn.dataset.idx, 10)); return; }
 
   const toggleDiag = e.target.closest('[data-action="toggle-diag"]');
-  if (toggleDiag) { toggleDiag.parentElement.classList.toggle('diag-open'); return; }
+  if (toggleDiag) {
+    const section = toggleDiag.parentElement;
+    const nowOpen = section.classList.toggle('diag-open');
+    const hint = toggleDiag.querySelector('.diag-toggle-hint');
+    if (hint) hint.textContent = nowOpen ? '[collapse]' : '[expand]';
+    return;
+  }
 });
 
 // ── Link Diagnostics ─────────────────────────────────────────────────
@@ -510,7 +516,10 @@ function runDiagnostic(swName, portIdx) {
       pollDiagnostic(resp.job_id, statusEl, resultsEl);
     })
     .catch(e => {
-      statusEl.textContent = 'Error: ' + (e.message || 'Request failed');
+      const msg = (e && e.status === 429)
+        ? 'Rate limit reached — max 5 diagnostics per minute. Please wait.'
+        : 'Error: ' + (e && e.message || 'Request failed');
+      statusEl.textContent = msg;
     });
 }
 
@@ -520,7 +529,13 @@ function pollDiagnostic(jobId, statusEl, resultsEl) {
     attempts++;
     if (attempts > 120) {  // 2min timeout
       clearInterval(_diagPollTimer);
-      statusEl.textContent = 'Timed out waiting for results.';
+      _diagPollTimer = null;
+      statusEl.innerHTML = 'Timed out waiting for results. '
+        + '<button class="lt-btn lt-btn-ghost lt-btn-sm" id="diag-retry-btn">Retry</button>';
+      document.getElementById('diag-retry-btn')?.addEventListener('click', () => {
+        const sel = document.querySelector('.switch-port-block.selected');
+        if (sel) runDiagnostic(sel.dataset.switch, parseInt(sel.dataset.portIdx));
+      });
       return;
     }
     lt.api.get(`/api/diagnose/${jobId}`)
@@ -535,7 +550,12 @@ function pollDiagnostic(jobId, statusEl, resultsEl) {
     .catch(() => {
       clearInterval(_diagPollTimer);
       _diagPollTimer = null;
-      statusEl.textContent = 'Error: lost connection while collecting diagnostics.';
+      statusEl.innerHTML = 'Error: lost connection while collecting diagnostics. '
+        + '<button class="lt-btn lt-btn-ghost lt-btn-sm" id="diag-retry-btn">Retry</button>';
+      document.getElementById('diag-retry-btn')?.addEventListener('click', () => {
+        const sel = document.querySelector('.switch-port-block.selected');
+        if (sel) runDiagnostic(sel.dataset.switch, parseInt(sel.dataset.portIdx));
+      });
     });
   }, 2000);
 }