enhance(frontend): Split the name and username onto separate lines.

[Natsuki-Kaede]

What

Split the name and username onto separate lines.

Why

close #14667

Checklist

• [x] Read the contribution guide
• [x] Test working in a local environment
• [ ] (If needed) Add story of storybook
• [ ] (If needed) Update CHANGELOG.md
• [ ] (If possible) Add tests

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 93.02326% with 3 lines in your changes missing coverage. Please review.

Project coverage is 19.54%. Comparing base (e9519b0) to head (96d4663).

Files with missing lines	Patch %	Lines
...ackages/frontend/src/components/MkNoteDetailed.vue	0.00%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #14668 +/- ## ============================================ - Coverage 41.40% 19.54% -21.87% ============================================ Files 1549 716 -833 Lines 199468 101516 -97952 Branches 3623 987 -2636 ============================================ - Hits 82595 19840 -62755 + Misses 116276 81130 -35146 + Partials 597 546 -51 ```

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[Natsuki-Kaede]

Ummm sorry I'll create another cleaner one