personal_menu: Move the theme switcher above the status settings.

[sayamsamal]

This PR improves the visual layout and resolves the inconsistency caused by having the theme switcher placed between the menu options.

CZO Discussion

Screenshots and screen captures:

Before	After

Self-review checklist

• Self-reviewed the changes for clarity and maintainability
  (variable names, code reuse, readability, etc.).

Communicate decisions, questions, and potential concerns.

• Explains differences from previous plans (e.g., issue description).
• Highlights technical choices and bugs encountered.
• Calls out remaining decisions and concerns.
• Automated tests verify logic where appropriate.

Individual commits are ready for review (see commit discipline).

• Each commit is a coherent idea.
• Commit message(s) explain reasoning and motivation for changes.

Completed manual review and testing of the following:

• Visual appearance of the changes.
• Responsiveness and internationalization.
• Strings and tooltips.
• End-to-end functionality of buttons, interactions and flows.
• Corner cases, error conditions, and easily imagined bugs.

[sayamsamal]

@timabbott this should be a quick merge, only moved some lines of code.

(Edit: There may be some discussion still on the way, so removed the integration label)

[zulipbot]

Heads up @sayamsamal, we just merged some commits that conflict with the changes you made in this pull request! You can review this repository's recent commits to see where the conflicts occur. Please rebase your feature branch against the upstream/main branch and resolve your pull request's merge conflicts accordingly.