fix(web): terminal types macOS Option-layer characters

apps/web/src/terminal/ghostty/core.test.ts

@@ -146,6 +146,26 @@ describe("GhosttyTerminalCore snapshots", () => {
     expect(core.encodeKey(event)).toBe(expected);
   });
 
+  it.each(["", "\x1b[>1u"])("encodes macOS Option text with keyboard mode %j", async (mode) => {
+    using _platform = vi.spyOn(navigator, "platform", "get").mockReturnValue("MacIntel");
+    const core = await createCore();
+    core.write(mode);
+    const option = {
+      code: "KeyL",
+      key: "@",
+      repeat: false,
+      shiftKey: false,
+      ctrlKey: false,
+      altKey: true,
+      metaKey: false,
+      isComposing: false,
+      getModifierState: () => false,
+    } as unknown as KeyboardEvent;
+
+    expect(core.encodeKey(option)).toBe("@");
+    expect(core.encodeKey({ ...option, code: "KeyA", key: "Å", shiftKey: true })).toBe("Å");
+  });
+
   it("preserves styles, wide cells, and selection after shared memory grows", async () => {
     const core = await createCore();
     const runtime = await loadGhosttyRuntime();

apps/web/src/terminal/ghostty/keyCodes.test.ts

@@ -49,6 +49,16 @@ describe("ghosttyConsumedMods", () => {
     expect(ghosttyConsumedMods({ ...shifted, ctrlKey: true })).toBe(0);
     expect(ghosttyConsumedMods({ ...shifted, key: "Tab" })).toBe(0);
     expect(ghosttyConsumedMods({ ...shifted, key: " " })).toBe(1);
+    expect(ghosttyConsumedMods({ ...shifted, altKey: true }, "Linux x86_64")).toBe(0);
+  });
+
+  it("consumes macOS Option when it produced a character", () => {
+    const option = { ...shifted, altKey: true, key: "[", shiftKey: false };
+    expect(ghosttyConsumedMods(option, "MacIntel")).toBe(1 << 2);
+    expect(ghosttyConsumedMods({ ...option, shiftKey: true }, "MacIntel")).toBe(1 | (1 << 2));
+    expect(ghosttyConsumedMods({ ...option, key: "ArrowLeft" }, "MacIntel")).toBe(0);
+    expect(ghosttyConsumedMods({ ...option, ctrlKey: true }, "MacIntel")).toBe(0);
+    expect(ghosttyConsumedMods({ ...option, metaKey: true }, "MacIntel")).toBe(0);
   });
 });
 

apps/web/src/terminal/ghostty/keyCodes.ts

@@ -1,4 +1,4 @@
-import { US_SHIFTED_TO_UNSHIFTED_KEYS } from "@t3tools/shared/keybindings";
+import { isMacPlatform, US_SHIFTED_TO_UNSHIFTED_KEYS } from "@t3tools/shared/keybindings";
 
 // This order mirrors GhosttyKey in ghostty/vt/key/event.h. The values are
 // intentionally derived from the official W3C-aligned enum instead of
@@ -216,12 +216,14 @@ export function loadGhosttyKeyboardLayoutMap(): Promise<GhosttyKeyboardLayoutMap
   return promise;
 }
 
-// Browsers omit consumed modifiers; treat Shift as consumed for unchorded characters.
+// Browsers omit consumed modifiers; macOS Option composes layout characters too.
 export function ghosttyConsumedMods(
   event: Pick<KeyboardEvent, "altKey" | "ctrlKey" | "key" | "metaKey" | "shiftKey">,
+  platform = navigator.platform,
 ): number {
-  if (!event.shiftKey || event.ctrlKey || event.altKey || event.metaKey) return 0;
-  return [...event.key].length === 1 ? 1 : 0;
+  if (event.ctrlKey || event.metaKey || [...event.key].length !== 1) return 0;
+  if (event.altKey && !isMacPlatform(platform)) return 0;
+  return (event.shiftKey ? 1 : 0) | (event.altKey ? 1 << 2 : 0);
 }
 
 export function ghosttyUnshiftedCodepoint(