refactor(src/styles/window): improve CSS file formatting and add screencapture.css

src/styles/window/dock.css

@@ -1,4 +1,3 @@
-/* ── Window container — transparent passthrough ──────────────────── */
 #dock {
     background: transparent;
     border: none;
@@ -6,18 +5,15 @@
     margin: 0;
 }
 
-/* ── Canvas wrapper — horizontal breathing room ──────────────────── */
 #dock-canvas-box {
     padding: 0px 50px 5px 50px;
     background: transparent;
 }
 
-/* ── Outer box — transparent so Cairo is the only visual ─────────── */
 #dock-outer-box {
     background: transparent;
 }
 
-/* ── Hover strip — keeps window alive at screen edge ─────────────── */
 #dock-hover-strip {
     min-height: 2px;
     min-width: 10px;