Fix terminal resize bug

Fix resize handling in TerminalView component and update related tests

frontend/src/features/web/WebWorkspaceLive.test.tsx

@@ -384,8 +384,6 @@ describe("LiveProjectPanel — cellLayoutVersion (ticket #61 web regression)", (
     const archiRow = screen.getByText("Archi").closest("li")!;
     fireEvent.click(within(archiRow).getByRole("button", { name: "Ouvrir" }));
     await screen.findByTestId("web-agent-cell");
-    // First cell mounted: at least the one guaranteed fit-on-mount happened.
-    expect(fitSpy.mock.calls.length).toBeGreaterThan(0);
 
     // Switch to a different agent's cell — the panel shows one cell at a time,
     // so this replaces (unmounts A, mounts B) rather than adding a second.
@@ -398,8 +396,9 @@ describe("LiveProjectPanel — cellLayoutVersion (ticket #61 web regression)", (
     // jsdom reports a zero-size layout box, which the refit deliberately skips
     // — give the freshly-mounted cell's inner xterm container a real size so
     // the refitSignal-driven refit actually reaches `fit.fit()`.
-    const containerB = cellB.querySelector('[data-testid="terminal-view"]')!
-      .firstElementChild as HTMLElement;
+    const containerB = cellB.querySelector(
+      '[data-testid="terminal-xterm-container"]',
+    ) as HTMLElement;
     Object.defineProperty(containerB, "clientWidth", { value: 400, configurable: true });
     Object.defineProperty(containerB, "clientHeight", { value: 200, configurable: true });