impr(languages): add Objective-C language (@damilss)

[Damilss]

Description

Add Objective-C language as a new language, which is interesting because there's swift but not objective-C. Went through and added languages

• (frontend/static/languages/code_objective_c.json): Contains around 200 words of objective C semantics and syntax
• (frontend/src/ts/constants/languages.ts) : Add Objective-C to constants
• (packages/schemas/src/languages.ts): add Objective-C to enum/schema.

Checks

• Adding quotes?
• Adding a language?
  • Make sure to follow the languages documentation
  • Add language to packages/schemas/src/languages.ts
  • Add language to exactly one group in frontend/src/ts/constants/languages.ts
  • Add language json file to frontend/static/languages
• Adding a theme?
• Adding a layout?
• Adding a font?
• Check if any open issues are related to this PR; if so, be sure to tag them below.
• Make sure the PR title follows the Conventional Commits standard.
• Make sure to include your GitHub username prefixed with @ inside parentheses at the end of the PR title.

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happy to contribute something small to the best typing game in the world :D

[Copilot]

Pull request overview

Adds Objective-C as a selectable “code” language across the schema + frontend language grouping, backed by a new static wordlist JSON (so it can be used like the existing code_* languages).

Changes:

• Add code_objective_c to the shared LanguageSchema enum.
• Add code_objective_c to the frontend LanguageGroups.code list.
• Add frontend/static/languages/code_objective_c.json wordlist (with noLazyMode: true).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/schemas/src/languages.ts	Extends language enum to include code_objective_c.
frontend/src/ts/constants/languages.ts	Adds code_objective_c to the code language group for UI grouping.
frontend/static/languages/code_objective_c.json	Introduces the Objective-C wordlist consumed by the language loader.