fix: context menu flips upward when near viewport bottom

- If click.y + 260 > window.innerHeight: position bottom instead of top
- Also clamp left to prevent right-edge overflow
- Menu now appears above the click point when there's no room below

app/static/js/app.jsx

@@ -16586,8 +16586,9 @@ const App = () => {
   })), " Ctrl+Scroll: Playhead"))), contextMenu && (contextMenu.isSubTab ? /*#__PURE__*/React.createElement("div", {
     className: "fixed z-[60] bg-[#2a2a2a] border border-zinc-700 rounded-lg shadow-2xl py-1 w-64 overflow-y-auto",
     style: {
-      left: contextMenu.x,
+      left: Math.min(contextMenu.x, window.innerWidth - 260),
-      top: Math.min(contextMenu.y, window.innerHeight - 200),
+      top: contextMenu.y + 200 > window.innerHeight ? undefined : contextMenu.y,
+      bottom: contextMenu.y + 200 > window.innerHeight ? (window.innerHeight - contextMenu.y) : undefined,
       maxHeight: '60vh'
     },
     onClick: e => e.stopPropagation()
@@ -16675,8 +16676,9 @@ const App = () => {
   }, "Ctrl+L"))) : /*#__PURE__*/React.createElement("div", {
     className: "fixed z-[60] bg-[#2a2a2a] border border-zinc-700 rounded-lg shadow-2xl py-1 w-64 overflow-y-auto",
     style: {
-      left: contextMenu.x,
+      left: Math.min(contextMenu.x, window.innerWidth - 260),
-      top: Math.min(contextMenu.y, window.innerHeight - 200),
+      top: contextMenu.y + 260 > window.innerHeight ? undefined : contextMenu.y,
+      bottom: contextMenu.y + 260 > window.innerHeight ? (window.innerHeight - contextMenu.y) : undefined,
       maxHeight: '60vh'
     },
     onClick: e => e.stopPropagation()