fix(app): refit terminal when returning to agent

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

@@ -157,4 +157,18 @@ describe("terminal-emulator-runtime", () => {
     expect(onCommittedA).toHaveBeenCalledTimes(1);
     expect(onCommittedB).toHaveBeenCalledTimes(1);
   });
+
+  it("forces a refit when resize is requested", () => {
+    const runtime = new TerminalEmulatorRuntime();
+    const fitAndEmitResize = vi.fn();
+
+    (runtime as unknown as { fitAndEmitResize: (force: boolean) => void }).fitAndEmitResize =
+      fitAndEmitResize;
+
+    runtime.resize();
+    runtime.resize({ force: true });
+
+    expect(fitAndEmitResize).toHaveBeenNthCalledWith(1, false);
+    expect(fitAndEmitResize).toHaveBeenNthCalledWith(2, true);
+  });
 });

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

@@ -76,6 +76,7 @@ export class TerminalEmulatorRuntime {
   };
   private terminal: Terminal | null = null;
   private fitAddon: FitAddon | null = null;
+  private fitAndEmitResize: ((force: boolean) => void) | null = null;
   private lastSize: { rows: number; cols: number } | null = null;
   private cleanup: (() => void) | null = null;
   private outputOperations: TerminalOutputOperation[] = [];
@@ -168,6 +169,7 @@ export class TerminalEmulatorRuntime {
         cols: nextCols,
       });
     };
+    this.fitAndEmitResize = fitAndEmitResize;
 
     fitAndEmitResize(true);
 
@@ -383,6 +385,10 @@ export class TerminalEmulatorRuntime {
     this.processOutputQueue();
   }
 
+  resize(input?: { force?: boolean }): void {
+    this.fitAndEmitResize?.(input?.force ?? false);
+  }
+
   focus(): void {
     this.terminal?.focus();
   }
@@ -413,6 +419,7 @@ export class TerminalEmulatorRuntime {
     }
     this.terminal = null;
     this.fitAddon = null;
+    this.fitAndEmitResize = null;
     this.lastSize = null;
   }