fix: batch - onboarding viewport, tooltip overflow, share button colors

[saurabhhhcodes]

Fixes:

• [BUG] [GSSoC'26] : Onboarding.tsx leaving the viewport. #922 Onboarding leaving viewport
• [BUG] [GSSoC'26] : fix: prevent horizontal overflow caused by tooltip positioning #1267 Tooltip causing horizontal overflow
• [BUG] [GSSoC'26] : NativeShareButton uses hardcoded Tailwind colors instead of CSS theme variables #1087 NativeShareButton hardcoded colors instead of theme variables

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