feat: add theme.state opacity tokens and split theme types

[adrcotfas]

Motivation

1. theme.state was missing.
Interaction-state opacities (hover, focus, press, drag) lived in the raw token layer but were never on the theme object. Components had to reach into the token layer directly, bypassing theme
overrides. theme.state.opacity fixes that.

2. src/theme/types.ts was getting too big.
All theme types lived in one 179-line file. Split into src/theme/types/ one file per concern so new types (like ThemeState) have a clear place to go.

No behavior changes for existing consumers: Theme gains one new required field (state), all built-in schemes populate it, and the barrel re-exports everything from the same path.

Related issue

See https://www.notion.so/callstack/React-Native-Paper-Foundation-for-MD3-Expressive-34c5d027c0f880edba3df107cd35946f?source=copy_link

#### Merge order:

• refactor: remove MD3 prefix and use deprecated aliases #4910

• refactor: move styles/ into src/theme/ tree #4915

• refactor: add color role table and buildScheme #4916

• feat: add theme.state opacity tokens and split theme types #4917

• feat: add theme.shapes and cornersToStyle #4919

• feat: add emphasized typescale and fix letter-spacing spec bugs #4920

• feat: add motion tokens (spring, easing, duration) #4922

• feat: add elevation tokens and fix Android dp spec bug #4923

  Test plan

  • yarn typescript -- no new type errors
  • yarn test -- all tests pass; updated ListSection snapshot reflects the new state field

[github-actions]

The mobile version of example app from this branch is ready! You can see it here.

[callstack-bot]

Hey @adrcotfas, thank you for your pull request 🤗. The documentation from this branch can be viewed here.