fix(website): route trailing bytes to a program launched mid-chunk in tutorial shell

website/src/lib/tutorial-shell.test.ts

@@ -45,6 +45,22 @@ describe("TutorialShell program dispatch", () => {
     expect(output.join("")).toContain("$ ");
   });
 
+  it("forwards trailing bytes to a program launched within the same chunk", () => {
+    const { program, shell, startProgram } = createHarness();
+
+    // A single chunk (e.g. a paste) both launches the program and carries the
+    // first keystroke for it. The trailing `q` must reach the program, not the
+    // shell line editor.
+    shell.handleInput("ascii-splash --no-mouse\rq");
+
+    expect(startProgram).toHaveBeenCalledWith(
+      "ascii-splash",
+      ["--no-mouse"],
+      expect.any(Function),
+    );
+    expect(program.handleInput).toHaveBeenCalledWith("q");
+  });
+
   it("disposes the active program with the shell", () => {
     const { program, shell } = createHarness();
 

website/src/lib/tutorial-shell.ts

@@ -101,6 +101,14 @@ export class TutorialShell {
         this.lineBuffer = '';
         this.historyIndex = null;
         this.historyDraft = '';
+        // `processCommand` may have launched an interactive program. Any bytes
+        // left in this chunk (e.g. a paste of `cmd\rinput`) belong to that
+        // program, not the shell line editor — forward them and stop parsing.
+        if (this.activeProgram) {
+          const rest = data.slice(index + 1);
+          if (rest) this.activeProgram.handleInput(rest);
+          return;
+        }
       } else if (ch === '\x7f' || ch === '\b') {
         if (this.lineBuffer.length > 0) {
           this.lineBuffer = this.lineBuffer.slice(0, -1);