Fix terminal color query replies

Answer OSC color queries from the daemon and suppress browser-side replies so response bytes do not race back into the shell prompt as user input.

packages/app/src/terminal/runtime/terminal-emulator-runtime.browser.test.ts

@@ -319,6 +319,9 @@ describe("terminal emulator runtime in a real browser", () => {
     { name: "DSR-?6", bytes: "\x1b[?6n" },
     { name: "DECRQM", bytes: "\x1b[1$p" },
     { name: "DECRQM-?", bytes: "\x1b[?1$p" },
+    { name: "OSC-10-foreground-color", bytes: "\x1b]10;?\x07" },
+    { name: "OSC-11-background-color", bytes: "\x1b]11;?\x07" },
+    { name: "OSC-12-cursor-color", bytes: "\x1b]12;?\x07" },
   ])("does not emit a PTY input reply for $name", async ({ bytes }) => {
     await page.viewport(900, 600);
     const mounted = createTerminalHost({ width: 720, height: 360 });

packages/app/src/terminal/runtime/terminal-emulator-runtime.ts

@@ -301,6 +301,9 @@ export class TerminalEmulatorRuntime {
         { prefix: "?", intermediates: "$", final: "p" },
         () => true,
       );
+      for (const code of [10, 11, 12]) {
+        terminal.parser.registerOscHandler(code, (data) => data.trim() === "?");
+      }
     };
     registerProtocolQuerySuppression();