feat(toaster): add Toaster organism with ToasterApi controller

[eumaninho54]

Summary

• Add Toaster Organism following the same architecture as BottomModal (static controller, ViewModel hook, Reanimated animation)
• ToasterApi.show({ type, title, description?, duration? }) and ToasterApi.hide() for imperative usage
• 4 types: success, error, warning, info — each with mapped color and Lucide icon
• Slide-in from bottom + fade animation via Reanimated (useReanimatedStyles)
• Auto-dismiss with configurable duration (default DEFAULT_TOAST_DURATION_MS = 3000)
• Absolute positioned at bottom of screen; pointerEvents gated by visibility

Changes

• src/components/Organisms/Toaster/ — full component with types, hooks, controller, constants, styles
• src/components/Organisms/index.ts — added export * from './Toaster'
• __mocks__/react-native-reanimated.ts — added interpolate mock
• example/.rnstorybook/stories/Organisms/Toaster/ — Default (4 types) + Interactive stories

Test plan

• yarn test --testPathPattern="Toaster" — 20 tests, 3 suites, all passing
• Mount <Toaster /> at app root and call ToasterApi.show({ type: 'success', title: 'Saved!' })
• Verify auto-dismiss after 3s
• Verify custom duration is honored
• Verify ToasterApi.hide() dismisses immediately
• Verify all 4 types render correct color
• Verify description is optional and renders correctly when provided
• Verify exit animation plays (toast slides down + fades out)
• Note: bottom offset does not account for iOS safe area home indicator — acceptable for v1

🤖 Generated with Claude Code

[github-actions]

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