Add fallback-avatar to reaction dropdown list

[pfefferle]

Add default avatar and error handling for the dropdown action list.

Before	After

Proposed changes:

• Removed unused code
• Added default avatar and error handling

Other information:

• Have you written new tests for your changes, if applicable?

Testing instructions:

• Go to '..'

Changelog entry

• Automatically create a changelog entry from the details below.

Changelog Entry Details

Significance

• Patch
• Minor
• Major

Type

• Added - for new features
• Changed - for changes in existing functionality
• Deprecated - for soon-to-be removed features
• Removed - for now removed features
• Fixed - for any bug fixes
• Security - in case of vulnerabilities

Message

Default avatar and error handling for the reactions popover list.

[Copilot]

Pull Request Overview

This pull request adds a default avatar and error handling for reaction items in the dropdown/popover list while removing unused components.

• Removed the unused ReactionDropdown component.
• Updated ReactionList to show a fallback avatar and include an onError handler for avatar images.
• Updated asset versions in build files and added a changelog entry.

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/reactions/reactions.js	Removed the unused ReactionDropdown and updated ReactionList with fallback avatar and error handling.
build/reactions/view.js	Updated build file version for reactions view module.
build/reactions/view.asset.php	Bumped asset version to reflect changes.
build/reactions/index.js	Updated build file version and minor adjustments in reaction rendering.
build/reactions/index.asset.php	Bumped asset version to reflect changes.
.github/changelog/1719-from-description	Created changelog entry for the default avatar and error handling update.

[Copilot]

[nitpick] If a unique identifier exists for each reaction, consider using it as the key in place of the array index to improve component stability during reordering.

Suggested change

	{ reactions.map( ( reaction, index ) => {
	const avatar = reaction.avatar || defaultAvatarUrl;
	return (
	<li key={ index }>
	{ reactions.map( ( reaction ) => {
	const avatar = reaction.avatar || defaultAvatarUrl;
	return (
	<li key={ reaction.id }>