…ncies (#760)

* fix(langs): declare all language packages as explicit dependencies

The generated src/index.ts imports from 20+ @codemirror/lang-* and
@codemirror/legacy-modes packages that were never declared in
package.json. They only worked as phantom dependencies hoisted from
@codemirror/language-data, which breaks under pnpm strict mode.

- Enhance gen-langs-map.cjs to auto-sync package.json dependencies
  after generating the TypeScript file
- Move @codemirror/language-data to devDependencies (only needed
  as input for the gen script, not at runtime)
- Remove @codemirror/language-data from peerDependencies

Fixes #759

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* chore(langs): pin @codemirror/language-data to 6.5.2

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com> dddf539

#760

#760 b39c29e

### What this PR does

Before this PR:
`@uiw/codemirror-extensions-langs`, `@uiw/codemirror-themes-all`, and
`@uiw/react-codemirror` were pinned at version 4.25.1 to work around a
phantom dependency issue.

After this PR:
- All three `@uiw/codemirror-*` packages are upgraded to 4.25.7 with
exact version pinning (no `^` prefix). The phantom dependency issue has
been resolved upstream, making this upgrade safe.
- Added `@codemirror/state` to `pnpm.overrides` to resolve version
duplication, and updated the overrides for `@codemirror/view`,
`@codemirror/language`, and `@codemirror/lint` to their latest versions.

Fixes #12829

### Why we need it and why it was done in this way

The following tradeoffs were made:
- Exact version pinning (removing `^`) is used to prevent unexpected
automatic upgrades that could reintroduce dependency issues.
- `pnpm.overrides` is used to enforce a single version of each
`@codemirror/*` core package across the entire dependency tree. Without
this, multiple versions coexist due to different sub-dependencies
resolving independently, which causes TypeScript errors because
CodeMirror uses private class properties for nominal typing.
- After the update, `@codemirror/state` has multiple dependency versions
(6.5.3 and 6.5.4 coexisting), which declare different types for the same
type name, causing TypeScript errors. Therefore, an override was added
for this dependency.

The following alternatives were considered:
- Using `^4.25.7` (range specifier) was considered but rejected in favor
of exact pinning for more predictable dependency resolution.
- Considered removing the override, but dependency analysis is difficult
to handle because the previous override has already left a fixed version
in the lock file. Deleting the lock file and regenerating it would cause
extensive changes.

Links to places where the discussion took place:
- #12829 — original issue that pinned versions to 4.25.1
- #13133 — also referenced the phantom dependency problem
- uiwjs/react-codemirror#760

### Breaking changes

None.

### Special notes for your reviewer

The `@codemirror/*` override versions are updated as follows:

| Package | Old | New |
|---|---|---|
| `@codemirror/state` | _(none)_ | 6.5.4 |
| `@codemirror/view` | 6.38.1 | 6.39.16 |
| `@codemirror/language` | 6.11.3 | 6.12.2 |
| `@codemirror/lint` | 6.8.5 | 6.9.5 |

### Checklist

- [x] PR: The PR description is expressive enough and will help future
contributors
- [x] Code: [Write code that humans can
understand](https://en.wikiquote.org/wiki/Martin_Fowler#code-for-humans)
and [Keep it simple](https://en.wikipedia.org/wiki/KISS_principle)
- [x] Refactor: You have [left the code cleaner than you found it (Boy
Scout
Rule)](https://learning.oreilly.com/library/view/97-things-every/9780596809515/ch08.html)
- [x] Upgrade: Impact of this change on upgrade flows was considered and
addressed if required
- [ ] Documentation: A [user-guide update](https://docs.cherry-ai.com)
was considered and is present (link) or not required. Check this only
when the PR introduces or changes a user-facing feature or behavior.
- [ ] Self-review: I have reviewed my own code (e.g., via
[`/gh-pr-review`](/.claude/skills/gh-pr-review/SKILL.md), `gh pr diff`,
or GitHub UI) before requesting review from others

### Release note

```release-note
NONE
```