Add SRT/FLV/RTMP support and update documentation

Introduced Python scripts for SRT subtitle checking and fixing, and added comprehensive documentation covering advanced features such as protocol detection, subtitle/audio/quality management, keyboard shortcuts, and touch gestures. Updated local settings to allow new build and Python commands, added TypeScript definitions for FLV, and implemented RTMP/FLV protocol support in the player. Removed CHANGELOG.md and made various improvements to styles and example app.

src/components/controls/ProgressBar.css

@@ -13,7 +13,7 @@
   height: 3px;
   background-color: var(--player-progress-bg);
   border-radius: var(--player-radius-full);
-  overflow: hidden;
+  overflow: visible;
   transition: height var(--player-transition-fast) ease;
 }
 
@@ -27,6 +27,7 @@
   inset: 0;
   width: 0;
   background-color: var(--player-progress-buffered);
+  border-radius: var(--player-radius-full);
   transition: width 0.12s ease;
 }
 
@@ -35,6 +36,7 @@
   inset: 0;
   width: 0;
   background-color: var(--player-primary);
+  border-radius: var(--player-radius-full);
   display: flex;
   align-items: center;
   justify-content: flex-end;
@@ -46,14 +48,16 @@
   height: 12px;
   border-radius: 50%;
   background-color: var(--player-primary);
-  transform: scale(0);
-  transition: transform var(--player-transition-fast) ease;
+  box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4);
+  transform: scale(1);
+  transition: transform var(--player-transition-fast) ease, box-shadow var(--player-transition-fast) ease;
   margin-right: -6px;
 }
 
 .progress-bar:hover .progress-handle,
 .progress-bar.seeking .progress-handle {
-  transform: scale(1);
+  transform: scale(1.15);
+  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.2);
 }
 
 .progress-tooltip {