Extract hardcoded rgba colors and inline styles to CSS classes

- Add .inline-error and .inline-warning utility classes to dashboard.css
  with correctly-matched terminal palette rgba values (replaces off-palette
  rgba(231,76,60,0.1) and rgba(241,196,15,0.1))
- Add .key-generated-alert class for the new API key display frame
- Add base .dependency-item, .dependency-group h4, .dependency-item a,
  .dependency-title, .btn-small overrides to ticket.css
- Remove all inline styles from the dependency list template in ticket.js
  — layout, colors, and sizing now come from CSS classes
- Update CreateTicketView.php and ApiKeysView.php to use the new classes

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

views/admin/ApiKeysView.php

@@ -67,7 +67,7 @@ $nonce = SecurityHeadersMiddleware::getNonce();
             </div>
 
             <!-- New Key Display (hidden by default) -->
-            <div id="newKeyDisplay" class="ascii-frame-inner" style="display: none; margin-bottom: 1.5rem; background: rgba(255, 176, 0, 0.1); border-color: var(--terminal-amber);">
+            <div id="newKeyDisplay" class="ascii-frame-inner key-generated-alert" style="display: none; margin-bottom: 1.5rem;">
                 <h3 style="color: var(--terminal-amber); margin-bottom: 0.5rem;">New API Key Generated</h3>
                 <p style="color: var(--priority-1); margin-bottom: 1rem; font-size: 0.9rem;">
                     Copy this key now. You won't be able to see it again!