supabase / supabase / 41779940872 / 1 – studio-tests

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Chore/cleanup dead code in project branch selector (#52691)

## Context

Just some housekeeping here while going through the repo, realised that
there's dead code in `ProjectBranchSwitcher`

## Changes involved:
- `ProjectBranchSelector` is only rendered by `MobileNavigationBar`,
which `DefaultLayout` only mounts when `useBreakpoint('md')` is true.
The selector's own `isMobile` check used the same breakpoint, so its
desktop `Popover` branch could never run.

- The name `ProjectBranchSelector` is also misleading since the sheet
switches more than just the project's branch + it's mobile-only, so
opting to rename it to `MobileProjectSwitcher` instead

- Also fix org rows in the sheet being tighter than project rows.
`compactPadding` was inverted, so the embedded list got `p-0.5` on the
item and lost the default `px-2 py-1.5`

- Align buttons in `ProjectBranchSelector` across all tabs + use outline
variant for secondary action

| Previous | Updated |
|---|---|
| <img width="352" height="174" alt="image"
src="https://github.com/user-attachments/assets/24cb2985-b568-4bc1-8f53-ab3914ef0804"
/> | <img width="351" height="161" alt="image"
src="https://github.com/user-attachments/assets/e6e9b0e9-c075-4235-93ca-80c5d070c287"
/> |
| <img width="336" height="248" alt="image"
src="https://github.com/user-attachments/assets/4071b73f-f741-4598-ba01-8dc7bb6ba57a"
/> | <img width="335" height="313" alt="image"
src="https://github.com/user-attachments/assets/2bea398d-ebe9-4641-9bfe-c4a7b6b10c51"
/> |

If you meant a different table, tell me what the two columns should be.
For example, file and change, or before and after behaviour.

3114 of 9432 branches covered (33.02%)

Branch coverage included in aggregate %.

5227 of 12652 relevant lines covered (41.31%)

49.01 hits per line