feat(docs): add a desktop troubleshooting guide

[neriousy]

What does this PR do?

Adds a troubleshooting guide for the desktop app users

How did you verify your code works?

[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, I found related PRs that may be connected to the desktop troubleshooting guide:

Potentially Related PRs:

1. PR docs(desktop): enhance README with environment setup #8487 - docs(desktop): enhance README with environment setup

   • Related as it's also desktop documentation focused on setup/configuration

2. PR docs/troubleshooting.mdx: add workaround for poor performance in large codebases #6771 - docs/troubleshooting.mdx: add workaround for poor performance in large codebases

   • Related as it's a troubleshooting guide that may overlap with or complement the desktop troubleshooting guide

3. PR docs: add macOS Dock shortcut guide #9263 - docs: add macOS Dock shortcut guide

   • Related as it's desktop-specific documentation

These PRs focus on desktop documentation and troubleshooting content, so they may have overlapping scope or could benefit from coordination to avoid duplication.