Feat/0 2 pwa installability

[gcharest]

This pull request introduces Progressive Web App (PWA) support, automated Lighthouse performance and accessibility checks, and expands both UI requirements and test coverage. The most important changes include adding a PWA manifest and meta tags, implementing end-to-end tests for PWA features, setting up a Lighthouse CI workflow with performance budgets, and enhancing the UI polish checklist and unit tests for meal management.

PWA Support and Metadata

• Added a comprehensive PWA manifest (public/manifest.json) with app details, icons (including maskable), theme and background colors, and offline-first configuration.
• Updated index.html to reference the manifest, set the theme color, and provide a descriptive meta tag for the app.

Automated Testing and Quality Assurance

• Replaced the basic Playwright test with a full suite in e2e/installation.spec.ts to verify PWA manifest, meta tags, icon accessibility, service worker registration, offline support, installability, and mobile viewport friendliness.
• Added a detailed unit test file for the meal store (src/stores/__tests__/meal.spec.ts), covering session, nutrient, carb calculation, and error handling logic.

Performance and Accessibility Monitoring

• Introduced a GitHub Actions workflow (.github/workflows/lighthouse.yml) to run Lighthouse CI on pushes and pull requests, uploading results as artifacts.
• Added a Lighthouse budget file (lighthouse-budget.json) to enforce limits on resource sizes and key performance metrics like FCP, LCP, CLS, and TBT.

UI Requirements and Versioning

• Expanded the UI polish checklist in the release notes to include new history view features (full nutrient breakdown, edit/delete/duplicate meals, filtering/search), supporting a more robust user experience.
• Updated the app version in package.json to 0.2.0 reflecting these major improvements.

[Copilot]

Pull request overview

This pull request introduces comprehensive PWA (Progressive Web App) capabilities, automated performance monitoring, and significantly expands test coverage for the Gluko carb calculator application. The changes transform the app into a fully installable, offline-capable PWA with enforced performance budgets.

Key changes:

• Complete PWA manifest and service worker configuration with offline-first caching strategies
• Automated Lighthouse CI workflow with performance/accessibility budgets
• Comprehensive test suites for nutrient file and meal stores (339 and 288 test cases respectively)

Reviewed changes

Copilot reviewed 13 out of 27 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
public/manifest.json	PWA manifest defining app metadata, icons, theme colors, and display mode for installation
index.html	Added manifest link, theme color meta tag, and app description for PWA support
vite.config.ts	Enhanced service worker config with runtime caching strategies for API, images, and fonts
vitest.config.ts	Enabled code coverage with 80% thresholds and targeted inclusion of stores/composables
e2e/installation.spec.ts	E2E tests verifying PWA manifest, service worker, offline support, and installability
src/stores/__tests__/nutrientsFile.spec.ts	Complete unit test suite for nutrient file store with 339 lines of test coverage
src/stores/__tests__/meal.spec.ts	Complete unit test suite for meal store covering session management and carb calculations
.github/workflows/lighthouse.yml	CI workflow running Lighthouse audits with budget enforcement on every push/PR
lighthouse-budget.json	Performance budgets for resource sizes and core web vitals metrics
docs/releases/v0.5-ui-polish.md	Expanded history view requirements with edit/delete/filter capabilities
docs/releases/v0.x-complete-redesign-proposal.md	Comprehensive redesign proposal document exploring future UI/UX overhaul options
package.json	Version bump to 0.2.0 reflecting PWA feature addition
public/icons/site.webmanifest	Additional manifest file for icon metadata

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