[grade=A urn:ump:josd2g7kqv476vux6euigmygdkijya2s4tsbyivtobw5ftzuf6ba] fix(DC-170): revive 19 CSP-blocked inline handlers across the dashboard — audit P0-3

The meta CSP (no unsafe-inline/unsafe-hashes) blocks ALL inline event
handlers; 19 controls were silently dead in every modern browser.

Revived:
- Disk Safety: toolbar button, injected modal Close/Save/Clean Up, and
  the 5 settings sliders (oninput -> input listeners; value labels
  never updated)
- AI chat FAB click; hover scale moved to a #ai-chat-fab:hover rule
- TOTP/login logo broken-image fallbacks: capture-phase error
  delegation + WeakSet + complete/naturalWidth race guard in
  totp-auth.js; updateTotpLogo never resurrects a broken logo
  (6 onerror attrs stripped from index.html + auth-gate.js templates)
- favicon-preview data-URI fallback (same race guard)
- app-selector folder-chip remove buttons (data-remove-folder)
- premium upsells in backup-restore + workflows (data-upgrade-msg) —
  their old onclick also called scrollToSection('license'), a function
  that has never existed anywhere in the codebase; now opens the real
  license UI via window.openLicenseModal (license.js)
- health-check Edit/Delete dispatch the same CustomEvents via
  data-health-action/data-service-id
- smart-arr Test button via data-smart-test

Verified: zero inline handler attributes remain across index.html +
hand-written js (grep); node --check clean x12; status suite 68/68;
dist rebuilt (SW dashcaddy-shell-36d9aa3364, CSP hash unchanged).
r1 grade C (missed sliders + logo onerror) -> r2 grade A:
urn:ump:mptri3qhywc2e47f2ba4qjafhwm3olzvrvt5vphxoyhea3vgt32a /
urn:ump:josd2g7kqv476vux6euigmygdkijya2s4tsbyivtobw5ftzuf6ba

status/js/smart-arr-connect.js

@@ -221,7 +221,7 @@
                    style="width: 100%; font-size: 0.85rem; padding: 6px 8px; background: var(--card-bg); color: var(--fg); border: 1px solid var(--border); border-radius: 4px;" />
           </div>
         </div>
-        <button onclick="smartTestConnection('${svc}')" style="margin-top: 8px; padding: 4px 12px; font-size: 0.75rem; cursor: pointer;">Test</button>
+        <button type="button" data-smart-test="${svc}" style="margin-top: 8px; padding: 4px 12px; font-size: 0.75rem; cursor: pointer;">Test</button>
       </div>`;
     }
 
@@ -263,6 +263,10 @@
     }
 
     credentialInputs.innerHTML = html;
+    // Audit P0-3: was inline onclick calling smartTestConnection (dead under CSP)
+    credentialInputs.querySelectorAll('[data-smart-test]').forEach((btn) => {
+      btn.addEventListener('click', () => window.smartTestConnection(btn.dataset.smartTest));
+    });
   }
 
   // Test connection (global for onclick)