feat : Librairie de base

src/theme/ThemeProvider.tsx

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+import { type PropsWithChildren, useMemo } from 'react';
+
+import colors from './colors';
+import spacing, { borderRadius } from './spacing';
+import typography from './typography';
+import { ThemeContext } from './useTheme';
+
+export function ThemeProvider({ children }: PropsWithChildren) {
+  const value = useMemo(
+    () => ({
+      colors,
+      typography,
+      spacing,
+      borderRadius,
+    }),
+    [],
+  );
+
+  return <ThemeContext.Provider value={value}>{children}</ThemeContext.Provider>;
+}

src/theme/colors.ts

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+export const colors = {
+  deepBackground: '#0A0A12',
+  surface: '#14141F',
+  surfaceElevated: '#1E1E2D',
+  border: '#2A2A3C',
+  primary: '#FF2E88',
+  secondary: '#7B3DFF',
+  tertiary: '#28E0F0',
+  success: '#3DDC97',
+  textPrimary: '#F4F4FA',
+  textSecondary: '#9A9AB4',
+  signatureGradient: ['#7B3DFF', '#FF2E88'] as const,
+} as const;
+
+export const signatureGradient = colors.signatureGradient;
+
+export default colors;

src/theme/index.ts

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+import colors from './colors';
+import spacing, { borderRadius } from './spacing';
+import typography from './typography';
+
+export const theme = {
+  colors,
+  typography,
+  spacing,
+  borderRadius,
+} as const;
+
+export * from './ThemeProvider';
+export * from './useTheme';
+export { borderRadius, colors, spacing, typography };
+
+export default theme;

src/theme/spacing.ts

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+export const spacing = {
+  4: 4,
+  8: 8,
+  12: 12,
+  16: 16,
+  24: 24,
+  32: 32,
+} as const;
+
+export const space = spacing;
+
+export const borderRadius = {
+  card: 20,
+  button: 14,
+  chip: 9999,
+} as const;
+
+export default spacing;

src/theme/typography.ts

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+import { Inter_400Regular, Inter_500Medium } from '@expo-google-fonts/inter';
+import { SpaceGrotesk_600SemiBold, SpaceGrotesk_700Bold } from '@expo-google-fonts/space-grotesk';
+import { useFonts } from 'expo-font';
+
+export const fontFamily = {
+  display: 'SpaceGrotesk_600SemiBold',
+  displayBold: 'SpaceGrotesk_700Bold',
+  body: 'Inter_400Regular',
+  bodyMedium: 'Inter_500Medium',
+  mono: 'monospace',
+} as const;
+
+export const typography = {
+  display: {
+    fontFamily: fontFamily.display,
+    fontSize: 40,
+    lineHeight: 48,
+    letterSpacing: -0.8,
+  },
+  screenTitle: {
+    fontFamily: fontFamily.displayBold,
+    fontSize: 26,
+    lineHeight: 32,
+    letterSpacing: -0.6,
+  },
+  cardTitle: {
+    fontFamily: fontFamily.display,
+    fontSize: 18,
+    lineHeight: 24,
+    letterSpacing: -0.2,
+  },
+  sectionLabel: {
+    fontFamily: fontFamily.mono,
+    fontSize: 11,
+    lineHeight: 16,
+    letterSpacing: 0.8,
+    textTransform: 'uppercase' as const,
+  },
+  body: {
+    fontFamily: fontFamily.body,
+    fontSize: 15,
+    lineHeight: 22,
+    letterSpacing: 0,
+  },
+  metadata: {
+    fontFamily: fontFamily.bodyMedium,
+    fontSize: 13,
+    lineHeight: 18,
+    letterSpacing: 0,
+  },
+  digits: {
+    fontFamily: fontFamily.mono,
+    fontSize: 11,
+    lineHeight: 16,
+    letterSpacing: 0.4,
+  },
+} as const;
+
+export const loadFonts = () =>
+  useFonts({
+    SpaceGrotesk_600SemiBold,
+    SpaceGrotesk_700Bold,
+    Inter_400Regular,
+    Inter_500Medium,
+  });
+
+export default typography;

src/theme/useTheme.ts

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+import { createContext, useContext } from 'react';
+
+import colors from './colors';
+import spacing, { borderRadius } from './spacing';
+import typography from './typography';
+
+export type ThemeContextValue = {
+  colors: typeof colors;
+  typography: typeof typography;
+  spacing: typeof spacing;
+  borderRadius: typeof borderRadius;
+};
+
+export const ThemeContext = createContext<ThemeContextValue | undefined>(undefined);
+
+export const useTheme = () => {
+  const context = useContext(ThemeContext);
+
+  if (!context) {
+    throw new Error('useTheme must be used within a ThemeProvider');
+  }
+
+  return context;
+};