Fix design system violations: replace off-brand colors with terminal palette

- dashboard.css: replace all hardcoded Tailwind hex colors (#2d3748, #1a202c,
  #e2e8f0, #4a5568, #007cba, #3b82f6 etc.) in dark-mode sections and component
  styles with terminal CSS variables (--bg-*, --text-*, --border-color,
  --terminal-green/amber)
- dashboard.css: fix card-priority colors white/black → var(--bg-primary)
- dashboard.css: fix card-assignee border-radius: 50% → 0 (no circles rule)
- dashboard.css: fix mobile bottom-sheet border-radius: 12px → 0
- dashboard.css: fix search-box focus border (#007cba → var(--terminal-green))
- dashboard.css: fix save-filter button blue (#3b82f6) → terminal green
- dashboard.css: fix search-results-info blue highlight → terminal green
- dashboard.css: fix btn-bulk/btn-secondary dark-mode bootstrap colors → terminal
- ticket.css: replace comprehensive dark-mode Tailwind hex block with CSS vars
- ticket.css: fix status-select white/black text → var(--bg-primary)
- ticket.css: fix status-select.status-resolved hardcoded #28a745 → var(--status-open)
- ticket.css: fix timeline dark-mode hardcoded colors → CSS vars
- ticket.css: fix .slider:before background white → var(--bg-primary)
- ticket.css: fix .btn-danger:hover color white → var(--bg-primary)
- ticket.css: fix visibility-groups-list label border-radius: 4px → 0
- ticket.css: add will-change: opacity to age-warning/age-critical animations
- views: bump CSS version strings to v=20260319c
- views/DashboardView.php: add aria-labels to card view quick action buttons

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

views/CreateTicketView.php

@@ -12,8 +12,8 @@ $nonce = SecurityHeadersMiddleware::getNonce();
     <title>Create New Ticket</title>
     <link rel="icon" type="image/png" href="<?php echo $GLOBALS['config']['ASSETS_URL']; ?>/images/favicon.png">
     <link rel="stylesheet" href="/assets/css/base.css">
-    <link rel="stylesheet" href="<?php echo $GLOBALS['config']['ASSETS_URL']; ?>/css/dashboard.css?v=20260319b">
-    <link rel="stylesheet" href="<?php echo $GLOBALS['config']['ASSETS_URL']; ?>/css/ticket.css?v=20260319b">
+    <link rel="stylesheet" href="<?php echo $GLOBALS['config']['ASSETS_URL']; ?>/css/dashboard.css?v=20260319c">
+    <link rel="stylesheet" href="<?php echo $GLOBALS['config']['ASSETS_URL']; ?>/css/ticket.css?v=20260319c">
     <script nonce="<?php echo $nonce; ?>" src="/assets/js/base.js"></script>
     <script nonce="<?php echo $nonce; ?>" src="<?php echo $GLOBALS['config']['ASSETS_URL']; ?>/js/utils.js"></script>
     <script nonce="<?php echo $nonce; ?>" src="<?php echo $GLOBALS['config']['ASSETS_URL']; ?>/js/dashboard.js?v=20260205"></script>
@@ -109,11 +109,11 @@ $nonce = SecurityHeadersMiddleware::getNonce();
                         <input type="text" id="title" name="title" class="editable" required placeholder="Enter a descriptive title for this ticket">
                     </div>
                     <!-- Duplicate Warning Area -->
-                    <div id="duplicateWarning" style="display: none; margin-top: 1rem; padding: 1rem; border: 2px solid var(--terminal-amber); background: rgba(241, 196, 15, 0.1);">
+                    <div id="duplicateWarning" role="alert" aria-live="polite" aria-atomic="true" style="display: none; margin-top: 1rem; padding: 1rem; border: 2px solid var(--terminal-amber); background: rgba(241, 196, 15, 0.1);">
                         <div style="color: var(--terminal-amber); font-weight: bold; margin-bottom: 0.5rem;">
                             Possible Duplicates Found
                         </div>
-                        <div id="duplicatesList"></div>
+                        <div id="duplicatesList" aria-live="polite"></div>
                     </div>
                 </div>
             </div>