refactor: overhaul timeline component, separate into different files

apps/web/src/hooks/use-keyboard-shortcuts.ts

@@ -0,0 +1,51 @@
+import { useEffect } from "react";
+import { useTimelineStore } from "@/stores/timeline-store";
+
+export function useKeyboardShortcuts() {
+  const { selectedClips, removeClipFromTrack, clearSelectedClips, undo, redo } =
+    useTimelineStore();
+
+  // Delete/Backspace - Delete selected clips
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if (
+        (e.key === "Delete" || e.key === "Backspace") &&
+        selectedClips.length > 0
+      ) {
+        selectedClips.forEach(({ trackId, clipId }) => {
+          removeClipFromTrack(trackId, clipId);
+        });
+        clearSelectedClips();
+      }
+    };
+    window.addEventListener("keydown", handleKeyDown);
+    return () => window.removeEventListener("keydown", handleKeyDown);
+  }, [selectedClips, removeClipFromTrack, clearSelectedClips]);
+
+  // Cmd+Z / Ctrl+Z - Undo
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if ((e.metaKey || e.ctrlKey) && e.key === "z" && !e.shiftKey) {
+        e.preventDefault();
+        undo();
+      }
+    };
+    window.addEventListener("keydown", handleKeyDown);
+    return () => window.removeEventListener("keydown", handleKeyDown);
+  }, [undo]);
+
+  // Cmd+Shift+Z / Ctrl+Shift+Z or Cmd+Y / Ctrl+Y - Redo
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if ((e.metaKey || e.ctrlKey) && e.key === "z" && e.shiftKey) {
+        e.preventDefault();
+        redo();
+      } else if ((e.metaKey || e.ctrlKey) && e.key === "y") {
+        e.preventDefault();
+        redo();
+      }
+    };
+    window.addEventListener("keydown", handleKeyDown);
+    return () => window.removeEventListener("keydown", handleKeyDown);
+  }, [redo]);
+}