feat(FE-001): implement social feed screen tab UI

[ayomidearegbeshola29-dev]

feat(FE-001): Implement Social Feed Screen Tab UI

Summary

Redesigns the Home screen (mobileapp/app/(personal)/home.tsx) to host a tab bar that lets users switch between Public Feed and Friends feeds.

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Changes

mobileapp/app/(personal)/home.tsx

• Added a tabBar row with two TouchableOpacity tabs: Public Feed and Friends
• Tracks the active tab via useState<"public" | "friends">("public")
• Active tab is visually highlighted with:
  • A 2px bottom border in COLORS.primary (#1A4B4A — dark green)
  • Label text rendered in COLORS.primary with bold weight
• Feed items are filtered by the active tab:
  • Public Feed — shows all non-PRIVATE items
  • Friends — shows FRIENDS-visibility items and items sent/received by the current user
  • PRIVATE items are excluded from both tabs

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Acceptance Criteria Checklist

• Users can switch between Public Feed and Friends tabs
• Active tab is highlighted in dark green (COLORS.primary = #1A4B4A)
• Feed list filters correctly based on active tab
• No regressions to existing balance card, quick actions, like/comment interactions, or comments modal

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How to Test

1. Open the app and navigate to the Home screen (logged-in personal account)
2. Verify two tabs are visible: Public Feed and Friends
3. Tap Friends — confirm only friend-visibility items appear and the tab label/underline turns dark green
4. Tap Public Feed — confirm all public items are shown and the tab switches back
5. Confirm the balance card, Pay/Request, Receive, Fund buttons, and like/comment interactions still work normally

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Screenshots

Attach simulator/device screenshots showing the tab bar in both active states

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Closes #309

[ONEONUORA]

@ayomidearegbeshola29-dev
i can not see your implementation

[ONEONUORA]

@ayomidearegbeshola29-dev
Pls update on this issue

[ONEONUORA]

@ayomidearegbeshola29-dev
Pls update on this