Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@apps/host/src/pages/notice-list/notice-list.tsx`:
- Around line 67-75: The catch block in handleCopyLink swallows errors so users
get no feedback on copy failures; update handleCopyLink to catch the exception
from navigator.clipboard.writeText and call toast.show with an error message
(e.g., '링크 복사에 실패했습니다.') to mirror the success toast, and optionally log the
caught error for debugging (use the existing toast.show and any local logger if
available).

In `@packages/ads-ui/src/components/button/add-to-watch/add-to-watch.tsx`:
- Around line 27-30: The button is always rendering aria-pressed which misuses
ARIA for non-toggle actions; change the AddToWatch component so aria-pressed is
only added when the component is actually a toggle (e.g., when the selected prop
is provided/used or an explicit isToggle prop is true). Update the JSX that
currently sets aria-pressed={selected} (in add-to-watch.tsx / AddToWatch) to
conditionally include the attribute (only when selected !== undefined or
isToggle === true) and leave it out for non-toggle actions like copy-link so
downstream callers can omit selected.

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@packages/ads-ui/src/components/button/add-to-watch/action-button.css.ts`:
- Line 5: Rename the generic style identifier `button` to a more descriptive
`actionButton` in the CSS module (update the exported constant name from
`button` to `actionButton`) and then update the corresponding component
`add-to-watch/action-button.tsx` to import and use the renamed `actionButton`
identifier (ensure any usages, className assignments or destructured imports
referencing `button` are replaced with `actionButton` and the export remains
default/ named consistent with the module).

In `@packages/ads-ui/src/components/index.ts`:
- Line 6: Restore a backward-compatible alias export so consumers can continue
using AddToWatchButton while encouraging migration to ActionButton: in the
components index module (where ActionButton is exported from
'./button/add-to-watch/action-button'), also export AddToWatchButton as a named
export that references the same default component (i.e., export AddToWatchButton
as an alias of ActionButton) and add a short deprecation comment; keep this
alias available for at least one release to allow gradual migration.

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@apps/host/src/pages/notice-list/notice-list.tsx`:
- Around line 73-81: handleCopyLink currently concatenates ENV.AUDIENCE_BASE_URL
and eventId without validation, allowing missing/misconfigured base URLs to
produce bad links; update handleCopyLink to validate ENV.AUDIENCE_BASE_URL first
(e.g., attempt to construct a new URL(base, path) using the URL constructor) and
only call navigator.clipboard.writeText when URL construction succeeds,
otherwise show an error toast; reference the handleCopyLink function,
ENV.AUDIENCE_BASE_URL, navigator.clipboard.writeText and toast.show when
implementing this change.

---

Duplicate comments:
In `@packages/ads-ui/src/components/index.ts`:
- Line 6: Keep a backward-compatible alias export so consumers using
AddToWatchButton won’t break: in packages/ads-ui/src/components/index.ts
continue exporting the new default as ActionButton (export { default as
ActionButton } from './button/add-to-watch/action-button') and add a deprecated
alias export for AddToWatchButton that re-exports the same default (i.e., export
{ default as AddToWatchButton } from './button/add-to-watch/action-button'),
include a brief deprecation comment above the alias to indicate it will be
removed in a future release so callers can migrate.