feat(app): mention file via context menu in file tree

[alexyaroshuk]

What does this PR do?

1. adds right-click context menu to the file tree:

feat-add-file-tree-context-menu.mp4

2. adds right-click context menu to the session tabs:

feat-add-session-tabs-context-menu.mp4

3. Adds following actions:

File tree:

• Open (file only)
• Mention in prompt

4. new keys in i18n for 'mention', 'close others'

Session tabs:

• Close
• Close others - closes other tabs
• Mention in prompt

How did you verify your code works?

manual test & e2e

Files changed:

Files	What Changed
file-tree.tsx	Added context menu using dynamic import() with createResourcer
session-sortable-tab.tsx	Added context menu via static import
session.tsx	Added mentionFile(), closeOtherTabs(), mentionTab() functions
session-side-panel.tsx	Wired context menu callbacks to components
i18n/*.ts (×16)	Added translations

[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:

No duplicate PRs found

[alexyaroshuk]

reworked to align with refactored session/session side panel, & merged the other pr in, please check @adamdotdevin , thanks.

[alexyaroshuk]

@adamdotdevin i solved the test failure - could you this a look?