fix: form item tooltip persists over chat after clicking a toggle

[laileni-aws]

Summary

A form-item tooltip (for example, the tooltip on a toggle switch such as the agentic-coding mode toggle) could remain on screen after the control was clicked, overlaying the chat and blocking interaction until it was dismissed. This PR makes the tooltip dismiss as soon as the control is activated.

Problem

Steps that reproduce the issue:

1. Hover over a form-item control that has a tooltip (e.g. a switch) — the tooltip appears.
2. Click the control to toggle it.
3. The tooltip stays visible on top of the chat and cannot be interacted around, making the chat temporarily unusable.

Root cause

In src/components/chat-item/chat-item-form-items.ts, the tooltip was wired to only two events:

mouseover: (e) => { /* ...show tooltip after a delay... */ },
mouseleave: this.hideTooltip

When the control is clicked:

• No handler hid the tooltip on click, and the overlay is created with closeOnOutsideClick: false, so clicking does not dismiss it.
• Toggling the control can cause the prompt input to re-render, which removes the control element before mouseleave fires. The tooltip Overlay is appended to the document body, so it is left orphaned on top of the chat with no element left to trigger mouseleave.

Fix

Dismiss the tooltip when the control is activated by also handling mousedown and click:

mouseover: (e) => { /* ...show tooltip after a delay... */ },
mousedown: this.hideTooltip,
click: this.hideTooltip,
mouseleave: this.hideTooltip

hideTooltip both closes an open tooltip overlay and clears the pending show-timer, so it also prevents a tooltip from appearing after the user has already clicked.

Testing

• Added unit tests in src/components/__test__/chat-item/chat-item-form-items.spec.ts:
  • the tooltip is shown on hover after the delay;
  • the tooltip is dismissed when the control is clicked (so it cannot block the chat after toggling);
  • a pending tooltip is cancelled when the control is clicked before the delay elapses.
• The dismiss/cancel tests were confirmed to fail against the previous implementation and pass with this change.
• Full unit test suite passes (npx jest): 72 suites / 845 tests.
• eslint and prettier --check pass; production build (npm run build) succeeds.

Additional change

• ui-tests/__test__/flows/quick-action-commands-header.ts: coerced the result of a Playwright evaluate call to a boolean with Boolean(...) before using it in a condition. This keeps the value a genuine boolean across toolchains, satisfying @typescript-eslint/strict-boolean-expressions, and keeps the repo lint gate green.

Notes

• Change is limited to tooltip event handling for form items; no public API changes.