[docs] Remove unused PlatformTag component and redundant tooltip on platform tags

[apicgg]

Summary

Cleanup of leftover artifacts from two older PRs (#4097, #4178):

• Remove website/core/PlatformTag.tsx — the component is not imported or referenced anywhere in the app. Confirmed via repo-wide search; only its own definition and export default exist. Safe to delete as dead code.
• Drop the title attribute on inline platform tags in docs/platform-specific-code.md — the "Android" / "iOS" badge labels are self-explanatory, so the hover tooltip ("This section is related to X platform") adds no information.

Why

These were introduced two years ago but never wired up across the docs. The component has sat unused, and the tooltip duplicates what the badge text already says. Removing both reduces surface area and avoids confusion for future contributors who might wonder which path is canonical.

Changes

• Delete website/core/PlatformTag.tsx
• Update docs/platform-specific-code.md to remove title="..." from the two inline <div className="label ..."> tags

Test plan

• Run the docs site locally and confirm the Android/iOS badges still render correctly on the Platform-Specific Code page
• Confirm no build/type errors from the deleted component

c/c @Simek @cortinico

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[Simek]

Hey @apicgg, thanks for the updates! 👍

Drop the title attribute on inline platform tags in docs/platform-specific-code.md — the "Android" / "iOS" badge labels are self-explanatory, so the hover tooltip ("This section is related to X platform") adds no information.

Ideally, we should have those more verbose descriptions for a11y purpose, but we can use aria-label instead. I guess that was the idea with the PlatformTag.tsx‎ component, but it's fine to remove it for now, since the component does not support all of the platforms anyway.