fix(dashboard): Fix size of buttons and use Link to navigate (#11366)

**What**
- Fixes the wrong `size` being used for the allocate items button.
- Updates the buttons that link to somewhere to use a Link and asChild instead of an onClick.

.changeset/thick-deers-guess.md

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+"@medusajs/dashboard": patch
+---
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+fix(dashboard): Fix size of buttons and use Link to navigate