supabase / supabase / 29422288569

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fix(studio): color regressions after theme update (#47794)

## What kind of change does this PR introduce?

Bug fix + small shared component

## What is the current behavior?

After the recent colour system changes, several UI elements lost
contrast in light mode:

- `InfoIcon` with a background appeared as a flat grey circle (glyph
fill matched the background)
- Several buttons forced `text-white`, which no longer contrasts
correctly against the updated brand fills
- Selected / completed check badges were inconsistent between call sites

## What is the new behavior?

- `InfoIcon` uses `text-background` for the glyph fill so the "i" is
visible against the grey circle
- www primary buttons drop hardcoded `text-white` and use standard
`Button` colours
- New shared `SuccessCheck` in `ui` for selected state and completion
progress (green circle; white check in light mode, black check in dark
mode)
- Documented in the design system with selected + progress examples

Note on `InfoIcon`:
[#47933](https://github.com/supabase/supabase/pull/47933) landed a
related fix using `text-background-200` (`--card`). This PR keeps
`text-background` instead, to match `CheckIcon` / `EyeOffIcon` in the
same file and avoid the legacy alias.

| Before | After |
| --- | --- |
| <img width="688" height="268" alt="CleanShot 2026-07-10 at 11 30
25@2x"
src="https://github.com/user-attachments/assets/c0276b0c-1023-46c8-805c-35a22def1353"
/> | <img width="664" height="278" alt="CleanShot 2026-07-10 at 11 29
43@2x"
src="https://github.com/user-attachments/assets/3508cf37-1b48-4fb7-a939-83522feb44f1"
/> |
| <img width="468" height="550" alt="CleanShot 2026-07-10 at 11 31
04@2x"
src="https://github.com/user-attachments/assets/acd42273-15ce-4fb2-9d0c-5a43ac23073c"
/> | <img width="460" height="540" alt="CleanShot 2026-07-10 at 11 32
50@2x"
src="https://github.com/user-attachments/assets/f66fb4bc-81f7-4df1-95f5-63980c4e8537"
/> |

## To test

Use the staging preview link from this PR and... (continued)

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