feat(deskop): Add Copy to Messages

[dbpolito]

What does this PR do?

Add copy messages to User messages and Session Summaries, it only shows on hover

How did you verify your code works?

No hover on User Message

Hover on small messages User Message

Hover the button

Hover on multi line messages:

Hover on Session Summaries

[github-actions]

Thanks for your contribution!

This PR doesn't have a linked issue. All PRs must reference an existing issue.

Please:

1. Open an issue describing the bug/feature (if one doesn't exist)
2. Add Fixes #<number> or Closes #<number> to this PR description

See CONTRIBUTING.md for details.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Based on my search results, I found a potentially related PR:

Related PR Found:

• PR feat: Copy Assistant Response Chain - one-click copy entire response chain including tool outputs #6444: "feat: Copy Assistant Response Chain - one-click copy entire response chain including tool outputs"
  • feat: Copy Assistant Response Chain - one-click copy entire response chain including tool outputs #6444

This PR is related because it also implements copy functionality for messages/responses in the desktop interface. While PR #7658 focuses on copying individual user messages and session summaries on hover, PR #6444 handles copying assistant response chains. These could be part of a broader effort to enhance message copying capabilities.

The other copy-related PRs found (#2160, #7520, #7028, #7395) are related to clipboard/input functionality in different contexts (CLI keybindings, SSH/tmux environments, general clipboard operations) rather than the desktop UI message copying feature.