good first issue: add a size/height variant prop to ProgressBar

[Austinaminu2]

Description

`ProgressBar` (`components/ui/progress-bar.tsx:13`) hardcodes its track height as `h-2` with no way to make it thicker/thinner, unlike other reusable UI components in the codebase (e.g. `Card`'s `size="sm"|"default"` pattern).

Location

`components/ui/progress-bar.tsx:13`

Task

Add a `size` prop (e.g. `"sm" | "default" | "lg"`) that maps to different height classes, defaulting to the current `h-2` behavior so existing usages are unaffected.

Good for newcomers because

Small, additive API change to a reusable component with a clear default-preserving requirement (no existing callers should visually change).

[queenfrostbite]

@queenfrostbite has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello maintainer, can you assign this issue to me?

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[Hexstar-labs]

@Hexstar-labs has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I'm familiar with this area of the codebase and ready to take this on. Can you assign it to me?

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@Hexstar-labs's PR #417 was approved and merged by @Austinaminu2.

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👏 Great work, @Hexstar-labs! Keep contributing to FlowwStar.

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This issue has been completed by @Hexstar-labs as part of the Stellar Wave Program's 7th Wave 🥳

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