fix: report clipboard and toast outcomes accurately

[pasqualevitiello]

Summary

Clipboard examples could show Copied before the write succeeded, the code example left Copy enabled when its textarea was empty, the report button could leave Generating report visible after success, and promise toasts emitted unhandled rejections. Reuse the existing clipboard hook (with registry dependencies), disable the code copy action until there is content, close the report progress toast in cleanup, and handle the promise helper's rejection.

Use the supported add/update toast lifecycle for the cancellable example: loading becomes success, an actual failure becomes error, and cancellation becomes neutral information feedback. Every outcome removes Cancel and restores the button to idle. Include regenerated registry assets. Covers F05, F06, F12, and D04.

Validation

• Targeted TypeScript and Biome checks passed.
• Registry dependency validation and registry generation passed.
• Isolated browser checks verified all three copy examples stay idle while clipboard writes are pending, show Copied on success, reset afterward, and keep idle feedback on rejection without an unhandled promise rejection.
• The code-copy button is disabled for an empty textarea, enables after typing, and disables again after keyboard deletion clears it.
• Controlled success/failure/cancellation verified report progress cleanup, including a hovered toast with paused expiry.
• Promise toast success/failure and cancellable toast success/failure/keyboard cancellation produced the expected feedback without unhandled rejections.
• Actual keyboard cancellation cleared the pending operation timer, removed Cancel, restored Download, and showed an information icon. Light/dark cancellation states were inspected.

Reviewer callouts

The existing clipboard hook logs denied writes and exposes no new user-facing error state. The promise helper forces rejected promises to error styling, so the cancellable example uses the supported add/update API to distinguish cancellation from failure. Browser verification used controlled fixture clipboard responses/task timers to avoid background-tab throttling; no full application build or E2E suite was run. Reverting this commit restores the previous examples.

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Project	Deployment	Actions	Updated
coss-com	Ready	Preview	Oct 14, 2026 7:43pm UTC
coss-com-ui	Ready	Preview	Oct 14, 2026 7:43pm UTC
coss-examples-calcom	Ready	Preview	Oct 14, 2026 7:43pm UTC

1 Skipped Deployment

Project	Deployment	Actions	Updated
coss-com-origin	Skipped		Oct 14, 2026 7:43pm UTC

[linear-code]

ENG-6152