Add split typecheck scripts for build and tests

[benceruleanlu]

yarn typescript did not check the tests folder before. This PR aims to resolve that.

Summary

• add typecheck, typecheck:build, and typecheck:tests scripts
• keep build-only typechecks for Vite compile/type flows
• add tsconfig.tests.json and update docs

┆Issue is synchronized with this Notion page by Unito

[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request refactors TypeScript type-checking configuration into three separate scripts (typecheck, typecheck:build, typecheck:tests) targeting different contexts, along with a new test-specific TypeScript configuration file. Documentation and build orchestration are updated to reference the new setup.

Changes

Cohort / File(s)	Summary
Documentation Updates AGENTS.md	Updated development workflow documentation to reflect renamed TypeScript type-check command from yarn typescript to yarn typecheck, with clarification for "TypeScript type checking (all)". Updated "Before Committing" step to use new lint/typecheck command.
Build Script Reorganization package.json	Replaced single typescript script with three specialized type-check scripts: typecheck (all files), typecheck:build (build files), and typecheck:tests (test files). Updated vite:compile and vite:types to use typecheck:build instead of typescript.
TypeScript Configuration tsconfig.tests.json	Added new configuration file extending base tsconfig.json with explicit test file inclusions (tests/**/\*, playwright.config.ts, playwright.setup.ts) to isolate test compilation settings.

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[Copilot]

Pull request overview

This PR adds separate TypeScript typecheck scripts to provide more granular control over type checking for different parts of the codebase. It introduces three new npm scripts (typecheck, typecheck:build, typecheck:tests) to replace the single typescript script, and creates a new tsconfig.tests.json configuration for testing-related files.

Changes:

• Adds three typecheck scripts: typecheck (all), typecheck:build (build only), typecheck:tests (tests only)
• Creates tsconfig.tests.json extending the base config to specifically include test files
• Updates AGENTS.md documentation to reflect the new command name

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
tsconfig.tests.json	New TypeScript config for test files, including tests directory and Playwright config files
package.json	Replaces typescript script with three granular typecheck scripts; updates build scripts to use typecheck:build
AGENTS.md	Updates documentation references from yarn typescript to yarn typecheck

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[Copilot]

The tsconfig.tests.json includes test files that are already covered by the base tsconfig.json's include patterns (which includes 'tests/**/*'). This creates redundancy since running 'tsc -p tsconfig.json' will already typecheck these files. Consider whether tsconfig.tests.json should exclude non-test files to provide true isolation, or clarify the intended purpose of having separate test typechecking if it's meant to run with different compiler options in the future.