feat: keyboard shortcuts, click-to-select, pulse/glow, smooth orbit resume (#4)

* feat: keyboard shortcuts, click-to-select, pulse/glow, smooth orbit resume

* feat: add camera controls and enhance keyboard shortcuts help; improve flight card accessibility

* feat: enhance flight layers and keyboard shortcuts; improve airline data structure

src/hooks/use-keyboard-shortcuts.ts

@@ -0,0 +1,73 @@
+"use client";
+
+import { useEffect, useRef } from "react";
+
+type ShortcutActions = {
+  onNorthUp: () => void;
+  onResetView: () => void;
+  onToggleOrbit: () => void;
+  onOpenSearch: () => void;
+  onToggleHelp: () => void;
+  onDeselect: () => void;
+};
+
+const INPUT_TAGS = new Set(["INPUT", "TEXTAREA", "SELECT"]);
+
+export function useKeyboardShortcuts(actions: ShortcutActions) {
+  const ref = useRef(actions);
+
+  useEffect(() => {
+    ref.current = actions;
+  }, [actions]);
+
+  useEffect(() => {
+    function handler(e: KeyboardEvent) {
+      const target = e.target as HTMLElement;
+      if (INPUT_TAGS.has(target.tagName) || target.isContentEditable) return;
+
+      const dialogOpen = !!document.querySelector(
+        '[role="dialog"][aria-modal="true"]',
+      );
+
+      if (e.ctrlKey || e.metaKey || e.altKey) return;
+
+      const a = ref.current;
+
+      if (e.key === "Escape") {
+        if (!dialogOpen) a.onDeselect();
+        return;
+      }
+
+      if (dialogOpen) return;
+
+      switch (e.key) {
+        case "n":
+        case "N":
+          e.preventDefault();
+          a.onNorthUp();
+          break;
+        case "r":
+        case "R":
+          e.preventDefault();
+          a.onResetView();
+          break;
+        case "o":
+        case "O":
+          e.preventDefault();
+          a.onToggleOrbit();
+          break;
+        case "/":
+          e.preventDefault();
+          a.onOpenSearch();
+          break;
+        case "?":
+          e.preventDefault();
+          a.onToggleHelp();
+          break;
+      }
+    }
+
+    window.addEventListener("keydown", handler);
+    return () => window.removeEventListener("keydown", handler);
+  }, []);
+}