feat: Setup Playwright E2E testing and optimize performance

[NiksheyYadav]

Closes #642. Closes #640.

Adds comprehensive Playwright testing for core user flows (Login, Profile, Roadmap) and fixes performance issues with static exports.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds Playwright end-to-end coverage and CI automation while adjusting app/runtime configuration to be more resilient in E2E runs and reducing client bundle weight.

Changes:

• Introduces Playwright E2E specs (login, profile settings, roadmap navigation) and a GitHub Actions workflow to run them.
• Adjusts Next/Playwright/Firebase-related config for E2E stability (E2E env flags, navigation timeouts, db/auth bypasses).
• Improves performance via deferred/dynamic loading (Three.js hero scene + confetti) and updates Tailwind plugin wiring.

Reviewed changes

Copilot reviewed 15 out of 17 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
tsconfig.json	Excludes Jest config from TS compilation scope.
playwright.config.ts	Makes E2E runs sequential/single-worker with longer timeouts + E2E env injection.
.github/workflows/playwright.yml	Adds CI workflow to run Playwright and upload reports on failure.
next.config.ts	Disables output: 'export' during E2E runs to support middleware/dev server.
src/lib/firebase.ts	Changes prod missing-env behavior from throw to warn.
src/hooks/useMaintenance.ts	Skips maintenance checks during E2E runs.
src/context/AuthContext.tsx	Adds E2E detection and optional mock auth via localStorage flag.
src/components/resources/QuizComponent.tsx	Lazy-loads canvas-confetti to reduce initial bundle.
src/components/home/Hero.tsx	Defers 3D header scene until hero enters viewport.
src/components/NotificationDropdown.tsx	Avoids notification reads/writes when db is unavailable.
tailwind.config.ts	Switches Tailwind animate plugin to ESM import usage.
tests/e2e/*.spec.ts	Adds/updates Playwright tests for key routes and UI states.
package.json	Updates dev dependencies (Jest/Firebase tools/cross-env).

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[Aditya948351]

Great job @NiksheyYadav on your first PR! The E2E test setup with Playwright looks solid and covers all the essential flows perfectly. Approved and merging!

As your changes seems to have solved two issues!
I am giving the quality:exceptional labels for this PR taking into account these parameters.

Welcome to our Repository, Good Luck for future PRs!
Do star the Repository if not already!