Add static checks for editor endpoint clients

[nonprofittechy]

Summary

• add reproducible Prettier, ESLint/SonarJS, and JavaScript checkJs tooling for the maintained editor endpoint clients
• add a tracked local pre-commit hook that formats staged JavaScript and runs the complete npm run check suite
• add GitHub Actions coverage for the same checks on pushes and pull requests
• fix the existing formatting, lint, SonarJS, and type-check findings without converting the browser code to TypeScript

Verification

• npm ci && npm run check
• commit hook completed successfully during commit
• Node syntax and JavaScript tests passed
• frontend regression tests: 46 passed, 29 subtests passed
• GitHub Actions workflow: .github/workflows/static_checks.yml

[Copilot]

Pull request overview

This PR introduces reproducible static-check tooling (Prettier, ESLint + SonarJS, and TypeScript checkJs) for the maintained browser “editor endpoint client” JavaScript modules, and wires those checks into both local development (pre-commit hook) and GitHub Actions.

Changes:

• Added Node-based formatting/linting/typecheck configuration (package.json, package-lock.json, eslint.config.mjs, tsconfig.json, Prettier config).
• Added local pre-commit hook (.githooks/pre-commit) and automated installation via npm prepare.
• Added CI workflow to run the same checks on pushes/PRs, and applied formatting/typecheck-driven fixes across the targeted editor client JS files.

Reviewed changes

Copilot reviewed 12 out of 15 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
tsconfig.json	Enables checkJs typechecking for the maintained editor endpoint client JS files.
package.json	Defines format, lint, typecheck, and check scripts plus hook installation via prepare.
package-lock.json	Locks the dev-tooling dependency graph for reproducible installs in CI and locally.
eslint.config.mjs	Adds ESLint + SonarJS configuration scoped to the maintained endpoint client files.
docassemble/ALWeaver/data/static/editor_validation_source.js	Formatting / checkJs-driven edits (no functional intent).
docassemble/ALWeaver/data/static/editor_runtime_inspector.js	Formatting / checkJs-driven edits (no functional intent).
docassemble/ALWeaver/data/static/editor_module_restart.js	Formatting / checkJs-driven edits (no functional intent).
docassemble/ALWeaver/data/static/editor_dirty_state.js	Formatting / checkJs-driven edits (no functional intent).
docassemble/ALWeaver/data/static/editor_api_client.js	checkJs-driven refactors and error handling adjustments.
docassemble/ALWeaver/data/static/editor_agent_chat.js	Formatting / checkJs-driven edits (no functional intent).
.prettierrc.json	Establishes consistent formatting rules for the JS tooling.
.prettierignore	Excludes node_modules from formatting.
.gitignore	Stops ignoring package*.json and ignores node_modules/ instead.
.github/workflows/static_checks.yml	Adds CI coverage for npm ci + npm run check.
.githooks/pre-commit	Formats staged JS and runs the full check suite before committing.

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[Copilot]

Fixed in ab88180.