feat: add comprehensive test coverage for various components and utilities

[Crauzer]

• Introduced unit tests for the library filter, notifications, and patcher session stores.
• Added tests for error handling utilities and query functions.
• Implemented mock setups for Tauri API interactions.
• Created fixtures for settings and installed mods to streamline testing.
• Configured Vitest for testing environment with coverage reporting.

[Copilot]

Pull request overview

This PR introduces a frontend Vitest testing setup (with mocks/fixtures) and adds a broad set of unit tests across both the TypeScript frontend utilities/stores and the Rust Tauri backend modules, along with CI updates to run the new test suite.

Changes:

• Added Vitest configuration (jsdom + globals) plus test setup, fixtures, and Tauri API mocks for frontend tests.
• Implemented new TypeScript unit tests for result/query/error helpers, stores, and the Tauri api wrapper.
• Added Rust unit tests across workshop/mods/overlay/patcher/error/state modules and introduced Rust dev-dependencies to support them; updated CI to run frontend tests.

Reviewed changes

Copilot reviewed 27 out of 30 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
vitest.config.ts	Adds Vitest config (aliasing, jsdom env, setup file, and coverage settings).
src/utils/result.test.ts	Unit tests for Result helpers (unwrap/map/match, etc.).
src/utils/query.test.ts	Unit tests for TanStack Query wrappers (queryFn, mutationFn, etc.).
src/utils/errors.test.ts	Unit tests for error-code helpers and context parsing.
src/test/utils.tsx	Adds a React Query + Testing Library render helper for component tests.
src/test/setup.ts	Registers Testing Library jest-dom matchers for Vitest.
src/test/mocks/tauri.ts	Adds Vitest mocks for Tauri core/event and common plugins.
src/test/globals.d.ts	Enables Vitest globals typings for the TS test environment.
src/test/fixtures.ts	Adds frontend fixtures for settings/mods/profiles to simplify tests.
src/stores/patcherSession.test.ts	Adds tests for the patcher session store behavior.
src/stores/notifications.test.ts	Adds tests for notifications store behavior (unread count, cap, dismiss).
src/stores/libraryFilter.test.ts	Adds tests for library filter store toggles and reset behavior.
src/lib/tauri.test.ts	Adds tests ensuring IPC wrappers call the expected Tauri commands + args.
src-tauri/src/workshop/projects.rs	Adds Rust unit tests for GitHub URL parsing and WAD filename detection.
src-tauri/src/workshop/packing.rs	Adds Rust unit tests around project validation and pack format parsing.
src-tauri/src/workshop/mod.rs	Adds Rust unit tests for project name validation and config-file discovery.
src-tauri/src/workshop/layers.rs	Adds Rust unit tests around layer config persistence scenarios.
src-tauri/src/state.rs	Adds Rust unit tests for Settings defaults and (de)serialization.
src-tauri/src/patcher/mod.rs	Adds Rust unit tests for patcher state defaults and phase serialization.
src-tauri/src/overlay/mod.rs	Adds Rust unit tests for game-dir resolution and overlay progress serialization.
src-tauri/src/overlay/fantome_content.rs	Adds Rust unit tests for Fantome ZIP parsing and WAD listing/overrides behavior.
src-tauri/src/mods/mod.rs	Adds Rust unit tests for profile slugging, index helpers, and path resolution.
src-tauri/src/mods/migration.rs	Adds Rust unit tests for CSLOL migration scanning + zip creation helpers.
src-tauri/src/mods/library.rs	Adds Rust unit tests for installed mod reading and Fantome metadata/thumbnail extraction.
src-tauri/src/error.rs	Adds Rust unit tests for error-code serialization and IPC result wrappers.
src-tauri/Cargo.toml	Adds Rust dev-dependencies (tempfile, assert_matches) for tests.
Cargo.lock	Locks new Rust dev-dependencies.
package.json	Adds Vitest scripts and dependencies; includes tests in check.
pnpm-lock.yaml	Locks new JS testing dependencies (vitest, jsdom, testing-library, coverage provider).
.github/workflows/ci.yml	Adds a separate frontend test job to run pnpm test.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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[Copilot]

Pull request overview

Copilot reviewed 26 out of 29 changed files in this pull request and generated 2 comments.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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