Roaming FAB Tab Bar
A white screen with a plain four-icon tab bar and one round blue button that changes place and purpose with the tab. The icon of the chosen tab turns into a heavier drawing (a solid house, a thick magnifier, a smiling face with a badge, a solid bubble) and wiggles on its own pivot. The button is a large plus above the middle of the bar on Home, shrinks away on Search and Add friends, pops in at the right as a smaller compose button on Chats, and slides along a shallow arc between its two places while one glyph turns into the other. Each tab shows its own page of placeholder cards or rows.
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React Native · Expo SDK 52+, TypeScript
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