Terminal aesthetic polish: Consolidate styles & fix visual bugs

## Issue 1: User-Header Consolidation (COMPLETED)
- Added centralized user-header CSS to dashboard.css
- Removed 156 lines of duplicate inline styles from 3 PHP files
- Updated to use proper terminal aesthetic colors:
  * Background: var(--bg-secondary) instead of #2c3e50
  * Text: var(--terminal-green) with glow effects
  * App title: var(--terminal-amber) with amber glow
  * Admin badge: Transparent with priority-1 border and [brackets]
- Removed border-radius from admin badge (terminal aesthetic)
- Added hover effects with color changes and glow

## Issue 2: Status Badge Text Wrapping (FIXED)
- Fixed "In Progress" status badge wrapping to new line
- Updated dashboard.css .status-In-Progress:
  * Increased min-width from 100px to 140px
  * Added white-space: nowrap
  * Added display: inline-block
- Updated ticket.css .status-In-Progress with same fixes
- Badge now displays `[ In Progress ]` on single line

## Issue 3: Border-Radius Cleanup (100% TERMINAL AESTHETIC)
- Removed ALL rounded corners across entire application
- Changed 14 instances in dashboard.css to border-radius: 0
- Changed 9 instances in ticket.css to border-radius: 0
- Includes avatar/profile images (now square boxes)
- Complete terminal aesthetic compliance: sharp rectangular edges

## Code Quality Improvements
- Net reduction: 69 lines of code (191 removed, 122 added)
- Single source of truth for user-header styling
- All colors use CSS variables for consistency
- Zero duplicate CSS remaining
- Easier maintenance going forward

## Visual Changes
- User header: Terminal green with amber accents
- Admin badge: Red border with [brackets], no rounded corners
- Back link: Green with amber hover + glow effects
- Status badges: Single line display, no wrapping
- All UI elements: Sharp rectangular corners (0px radius)

## Files Modified
- assets/css/dashboard.css: +102 lines (user-header CSS, status fix, border-radius cleanup)
- assets/css/ticket.css: +3 lines (status fix, border-radius cleanup)
- views/DashboardView.php: -53 lines (removed inline styles)
- views/TicketView.php: -57 lines (removed inline styles)
- views/CreateTicketView.php: -57 lines (removed inline styles)

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

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

assets/css/ticket.css

@@ -42,6 +42,9 @@
     text-transform: uppercase;
     font-size: 0.9em;
     letter-spacing: 0.5px;
+    min-width: 140px;
+    white-space: nowrap;
+    display: inline-block;
     font-family: var(--font-mono);
     text-shadow: 0 0 5px var(--status-in-progress), 0 0 10px var(--status-in-progress);
 }
@@ -323,7 +326,7 @@
 .editable {
     padding: 10px;
     border: 1px solid var(--border-color);
-    border-radius: 6px;
+    border-radius: 0;
     background: var(--bg-primary);
     color: var(--text-primary);
     transition: all 0.3s ease;
@@ -360,7 +363,7 @@ textarea.editable {
 .btn {
     padding: 10px 20px;
     border: none;
-    border-radius: 6px;
+    border-radius: 0;
     cursor: pointer;
     font-weight: 500;
     background: var(--bg-primary);
@@ -599,7 +602,7 @@ textarea.editable {
     min-height: 100px;
     padding: 10px;
     border: 1px solid var(--border-color);
-    border-radius: 6px;
+    border-radius: 0;
     background: var(--bg-primary);
 }
 
@@ -612,13 +615,13 @@ textarea.editable {
 .markdown-preview code {
     background: var(--bg-secondary);
     padding: 2px 4px;
-    border-radius: 4px;
+    border-radius: 0;
 }
 
 .markdown-preview pre {
     background: var(--bg-secondary);
     padding: 10px;
-    border-radius: 6px;
+    border-radius: 0;
     overflow-x: auto;
 }
 
@@ -664,11 +667,11 @@ textarea.editable {
 }
 
 .slider.round {
-    border-radius: 24px;
+    border-radius: 0;
 }
 
 .slider.round:before {
-    border-radius: 50%;
+    border-radius: 0;
 }
 
 input:checked + .slider {
@@ -695,7 +698,7 @@ input:checked + .slider:before {
     background: var(--bg-secondary);
     color: var(--text-primary);
     padding: 10px 20px;
-    border-radius: 6px;
+    border-radius: 0;
     border: 1px solid var(--border-color);
     cursor: pointer;
     transition: background-color 0.3s ease;
@@ -840,7 +843,7 @@ body.dark-mode .timeline-date {
 /* Status select dropdown */
 .status-select {
     padding: 8px 16px;
-    border-radius: 6px;
+    border-radius: 0;
     font-weight: 500;
     text-transform: uppercase;
     font-size: 0.9em;