fix: Convert timeline header styles to CSS classes

Moved inline styles for timeline headers in chapters and video editors to dedicated CSS classes for better maintainability and consistency.

.gitignore

@@ -35,3 +35,4 @@ frontend-tools/video-editor/client/public/videos/sample-video.mp3
 frontend-tools/chapters-editor/client/public/videos/sample-video.mp3
 static/chapters_editor/videos/sample-video.mp3
 static/video_editor/videos/sample-video.mp3
+templates/todo-MS4.md

frontend-tools/chapters-editor/client/src/App.tsx

@@ -150,6 +150,11 @@ const App = () => {
                     canRedo={historyPosition < history.length - 1}
                 />
 
+                {/* Timeline Header */}
+                <div className="timeline-header-container">
+                    <h2 className="timeline-header-title">Add Chapters</h2>
+                </div>
+
                 {/* Timeline Controls */}
                 <TimelineControls
                     currentTime={currentTime}

frontend-tools/chapters-editor/client/src/styles/TimelineControls.css

@@ -1,4 +1,16 @@
 #chapters-editor-root {
+    .timeline-header-container {
+        margin-left: 1rem;
+        margin-top: -0.5rem;
+    }
+
+    .timeline-header-title {
+        font-size: 1.125rem;
+        font-weight: 600;
+        color: #059669;
+        margin: 0;
+    }
+
     .timeline-container-card {
         background-color: white;
         border-radius: 0.5rem;
@@ -11,6 +23,8 @@
         display: flex;
         justify-content: space-between;
         align-items: center;
+        padding-bottom: 0.5rem;
+        border-bottom: 2px solid rgba(16, 185, 129, 0.2);
     }
 
     .timeline-title {
@@ -21,6 +35,8 @@
 
     .timeline-title-text {
         font-weight: 700;
+        color: #059669;
+        font-size: 0.875rem;
     }
 
     .current-time {
@@ -48,10 +64,11 @@
     .timeline-container {
         position: relative;
         min-width: 100%;
-        background-color: #fafbfc;
+        background-color: #E2EDE4;
         height: 70px;
         border-radius: 0.25rem;
         overflow: visible !important;
+        border: 1px solid rgba(16, 185, 129, 0.2);
     }
 
     .timeline-marker {
@@ -194,7 +211,7 @@
         left: 0;
         right: 0;
         padding: 0.4rem;
-        background-color: rgba(0, 0, 0, 0.4);
+        background-color: rgba(16, 185, 129, 0.6);
         color: white;
         opacity: 1;
         transition: background-color 0.2s;
@@ -202,15 +219,15 @@
     }
 
     .clip-segment:hover .clip-segment-info {
-        background-color: rgba(0, 0, 0, 0.5);
+        background-color: rgba(16, 185, 129, 0.7);
     }
 
     .clip-segment.selected .clip-segment-info {
-        background-color: rgba(59, 130, 246, 0.5);
+        background-color: rgba(5, 150, 105, 0.8);
     }
 
     .clip-segment.selected:hover .clip-segment-info {
-        background-color: rgba(59, 130, 246, 0.4);
+        background-color: rgba(5, 150, 105, 0.75);
     }
 
     .clip-segment-name {

frontend-tools/video-editor/client/src/App.tsx

@@ -309,6 +309,11 @@ const App = () => {
           canRedo={historyPosition < history.length - 1}
         />
 
+                 {/* Timeline Header */}
+                 <div className="timeline-header-container">
+                     <h2 className="timeline-header-title">Trim or Split</h2>
+                 </div>
+
         {/* Timeline Controls */}
         <TimelineControls
           currentTime={currentTime}

frontend-tools/video-editor/client/src/styles/TimelineControls.css

@@ -1,4 +1,16 @@
 #video-editor-trim-root {
+    .timeline-header-container {
+        margin-left: 1rem;
+        margin-top: -0.5rem;
+    }
+
+    .timeline-header-title {
+        font-size: 1.125rem;
+        font-weight: 600;
+        color: #2563eb;
+        margin: 0;
+    }
+
     .timeline-container-card {
         background-color: white;
         border-radius: 0.5rem;
@@ -11,6 +23,8 @@
         display: flex;
         justify-content: space-between;
         align-items: center;
+        padding-bottom: 0.5rem;
+        border-bottom: 2px solid rgba(59, 130, 246, 0.2);
     }
 
     .timeline-title {
@@ -21,6 +35,8 @@
 
     .timeline-title-text {
         font-weight: 700;
+        color: #2563eb;
+        font-size: 0.875rem;
     }
 
     .current-time {
@@ -48,10 +64,11 @@
     .timeline-container {
         position: relative;
         min-width: 100%;
-        background-color: #fafbfc;
+        background-color: #eff6ff;
         height: 70px;
         border-radius: 0.25rem;
         overflow: visible !important;
+        border: 1px solid rgba(59, 130, 246, 0.2);
     }
 
     .timeline-marker {
@@ -194,7 +211,7 @@
         left: 0;
         right: 0;
         padding: 0.4rem;
-        background-color: rgba(0, 0, 0, 0.4);
+        background-color: rgba(59, 130, 246, 0.6);
         color: white;
         opacity: 1;
         transition: background-color 0.2s;
@@ -202,15 +219,15 @@
     }
 
     .clip-segment:hover .clip-segment-info {
-        background-color: rgba(0, 0, 0, 0.5);
+        background-color: rgba(59, 130, 246, 0.7);
     }
 
     .clip-segment.selected .clip-segment-info {
-        background-color: rgba(59, 130, 246, 0.5);
+        background-color: rgba(37, 99, 235, 0.8);
     }
 
     .clip-segment.selected:hover .clip-segment-info {
-        background-color: rgba(59, 130, 246, 0.4);
+        background-color: rgba(37, 99, 235, 0.75);
     }
 
     .clip-segment-name {