fix: remove toolbar window listeners on unmount

[ArturQuirino]

Summary

Ensures the default editor Toolbar removes its window resize and keydown listeners when the component is destroyed, not only when a <KeepAlive> boundary deactivates it.

Problem

onDeactivated runs for kept-alive components when they are hidden, but not on a normal unmount. Global listeners registered in onMounted could therefore stay attached after the toolbar was torn down.

Solution

• Introduce a small teardownWindowListeners() helper and call it from both onDeactivated and onBeforeUnmount.
• Add Toolbar.test.js to assert removeEventListener is invoked with the same handler references used in addEventListener (important because resize uses a throttled wrapper).

Test plan

• pnpm --filter @superdoc/super-editor exec vitest run src/editors/v1/components/toolbar/Toolbar.test.js
• (optional) pnpm --filter @superdoc/super-editor exec vitest run src/editors/v1/tests/toolbar/

[caio-pizzol]

@ArturQuirino clean fix, and it matches how SuperEditor.vue already does this. one thing to think about: onDeactivated removes the listeners but nothing puts them back on show — if the toolbar ever lives inside <KeepAlive>, it'll break after the first hide. not caused by this PR, just worth checking. also suggested one extra test so the two paths stay covered. left inline notes.

[caio-pizzol]

onDeactivated runs when a <KeepAlive> hides this component, but there's no onActivated to put the listeners back when it's shown again. if the toolbar is ever wrapped in <KeepAlive>, the second time it shows up Cmd+F and the resize handling will be dead. if it's never wrapped, you can just drop onDeactivated and keep onBeforeUnmount. worth a look?

[caio-pizzol]

the test only checks the unmount path. the whole point of this fix is that both paths matter — could you add one that hides the toolbar inside <KeepAlive> too? that way nobody deletes onDeactivated later thinking it's unused.