fix(docs): fix oxfmt formatting in Footer.vue

[Copilot]

docs/.vitepress/theme/components/Footer.vue was the only file failing vp fmt --check in the target branch. Fixes the formatting to comply with the project's oxfmt configuration (singleQuote: true, semi: true):

• Fixed <Sponsors> attribute indentation
• Added semicolon to the import statement

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[Brooooooklyn]

@copilot only 1 file check failed in target branch

[Copilot]

@copilot only 1 file check failed in target branch
<img width="1718" height="506" alt="CleanShot 2026-03-02 at 22 19 12@2x" src="https://github.com/user-attachments/assets/adc61270-...

Fixed in 896de96 — the previous commit was using oxfmt@0.36.0 directly (bypassing the project's vite.config.ts config) which changed 38 files incorrectly. This commit reverts those and only applies the correct fix to Footer.vue: proper attribute indentation and a semicolon on the import (matching the project's singleQuote: true, semi: true settings).