Phase 4: Light mode removal + CreateTicketView restructuring

## Light Mode Removal & Optimization
- Removed theme toggle functionality from dashboard.js
- Forced dark mode only (terminal aesthetic)
- Cleaned up .theme-toggle CSS class and styles
- Removed body.light-mode CSS rules from all view files
- Simplified user-header styles to use static dark colors
- Removed CSS custom properties (--header-bg, --header-text, --border-color)
- Removed margin-right for theme toggle button (no longer needed)

## CreateTicketView Complete Restructuring
- Added user header with back link and user info
- Restructured into 6 vertical nested ASCII sections:
  1. Form Header - Create New Ticket introduction
  2. Template Selection - Optional template dropdown
  3. Basic Information - Title input field
  4. Ticket Metadata - Status, Priority, Category, Type (4-column)
  5. Detailed Description - Main textarea
  6. Form Actions - Create/Cancel buttons
- Each section wrapped in ascii-section-header → ascii-content → ascii-frame-inner
- Added ASCII dividers between all sections
- Added ╚╝ bottom corner characters to outer frame
- Improved error message styling with priority-1 color
- Added helpful placeholder text and hints

## Files Modified
- assets/css/dashboard.css: Removed theme toggle CSS (~19 lines)
- assets/js/dashboard.js: Removed initThemeToggle() and forced dark mode
- views/DashboardView.php: Simplified user-header CSS (removed light mode)
- views/TicketView.php: Simplified user-header CSS (removed light mode)
- views/CreateTicketView.php: Complete restructuring (98→242 lines)

## Code Quality
- Maintained all existing functionality and event handlers
- Kept all class names for JavaScript compatibility
- Consistent nested frame structure across all pages
- Zero breaking changes to backend or business logic
- Optimized by removing ~660 unused lines total

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

assets/css/dashboard.css

@@ -1288,25 +1288,6 @@ input[type="checkbox"]:checked {
 }
 
 /* ===== UTILITY STYLES ===== */
-.theme-toggle {
-    position: absolute;
-    top: 20px;
-    right: 20px;
-    z-index: 100;
-    padding: 12px;
-    border-radius: 50%;
-    background: var(--bg-secondary);
-    border: 1px solid var(--border-color);
-    cursor: pointer;
-    box-shadow: var(--shadow);
-    font-size: 1.2em;
-    transition: transform 0.3s ease;
-}
-
-.theme-toggle:hover {
-    transform: scale(1.1);
-}
-
 .ticket-link {
     font-family: 'Courier New', monospace;
     font-weight: bold;

assets/js/dashboard.js

@@ -37,12 +37,11 @@ document.addEventListener('DOMContentLoaded', function() {
     }
     
     // Initialize for all pages
-    initThemeToggle();
     initSettingsModal();
-    
-    // Load saved theme preference
-    const savedTheme = localStorage.getItem('theme') || 'light';
-    document.documentElement.setAttribute('data-theme', savedTheme);
+
+    // Force dark mode only (terminal aesthetic - no theme switching)
+    document.documentElement.setAttribute('data-theme', 'dark');
+    document.body.classList.add('dark-mode');
 });
 
 function initTableSorting() {
@@ -178,19 +177,6 @@ function saveSettings() {
     window.location.reload();
 }
 
-function initThemeToggle() {
-    const toggle = document.createElement('button');
-    toggle.className = 'theme-toggle';
-    toggle.innerHTML = '🌓';
-    toggle.onclick = () => {
-        const currentTheme = document.documentElement.getAttribute('data-theme');
-        const newTheme = currentTheme === 'dark' ? 'light' : 'dark';
-        document.documentElement.setAttribute('data-theme', newTheme);
-        localStorage.setItem('theme', newTheme);
-    };
-    document.body.appendChild(toggle);
-}
-
 function initStatusFilter() {
     const filterContainer = document.createElement('div');
     filterContainer.className = 'status-filter-container';