Add git hooks for lockfile sync and pre-push typecheck, migrate lint-staged to dedicated config

[httphypixelnet]

Description

This PR adds additional git hooks and improves the lint-staged configuration to run linters/formatters only on staged files, rather than the entire codebase.

What changed

• New git hooks:

  • .husky/pre-push — runs pnpm typecheck --minimumFailingSeverity warning before pushes
  • .husky/post-checkout — runs scripts/post-checkout.mjs to auto-detect lockfile changes and re-run pnpm install

• New scripts:

  • scripts/stamp.mjs — utility to hash the lockfile and write/read a checksum stamp in node_modules
  • scripts/post-checkout.mjs — compares lockfile hash to the stamp; if changed, runs pnpm install automatically
  • scripts/postinstall.ts — writes the lockfile hash stamp after pnpm install
  • scripts/syncLockfile.lint.ts — validates that pnpm-lock.yaml is in sync with package.json, fixing the increasingly common issue of people switching branches without updating their lockfile.

• New lint-staged.config.mjs — replaces the inline lint-staged config in package.json with a proper config file. Each file pattern now passes only the matched files to its respective tool (prettier, eslint, remark, spotless, glossary generation, lockfile sync), instead of running global pnpm format/pnpm lint on every staged file. This should hopefully reduce time it takes for commits to be generated.

• ESLint config updates (eslint.config.mjs):

  • Uses defineConfig from eslint/config, enabling type hints for the config file in editors
  • no-undef is now 'error' locally but 'off' in CI (since astro check covers type-checking there)
  • Added globals.node for scripts/* and src/plugins/*
  • Added Astro virtual file globals to **/*.astro/**/*.ts files
  • Removed scripts/ from the ignores list (now linted)

Meta

Merge checklist:

• Pull Request title is short, imperative summary of proposed changes
• The description documents the what and why, including events that led to this PR
• Pull Request has been linted and formatted and follows the styleguide

This PR body has been generated by an LLM for readability, but I've reviewed and corrected it.

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