Add system-following Auto theme mode and bump release to 3.2.2

[Copilot]

This updates theme handling so users can choose Auto mode and have app appearance follow the system light/dark setting on iOS, instead of manually toggling only Light/Dark. It also updates release metadata for 3.2.2.

• Theme mode model + persistence

  • Expanded theme preference from binary to auto | light | dark.
  • Added themeMode + setThemeMode(mode) in ThemeContext.
  • Kept backward compatibility for legacy boolean theme values.

• System appearance integration

  • Wired auto mode to useColorScheme() so effective theme tracks OS changes.
  • Existing isDark consumers continue to work, now derived from selected mode + system scheme.

• Settings UI

  • Replaced the Dark Mode switch in app/settings/theme.tsx with an explicit segmented-style selector:
    • Auto
    • Light
    • Dark

• Localization + release metadata

  • Added English translation keys for the new selector labels.
  • Added a new top changelog entry in constants/changelog.ts for 3.2.2.
  • Bumped package.json (and lockfile) version to 3.2.2.

// Theme selector usage in settings
{(['auto', 'light', 'dark'] as const).map((mode) => (
  <TouchableOpacity key={mode} onPress={() => setThemeMode(mode)}>
    <Text>{t(`screens.settings.themeMode${mode.charAt(0).toUpperCase()}${mode.slice(1)}`)}</Text>
  </TouchableOpacity>
))}

[taylorcox75]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Resolved — I merged origin/main into this branch and fixed the conflicts in package.json, package-lock.json, and constants/changelog.ts in commit c2ae509.