Add gba emulator

[nathblade16]

Allows people to play there very legally obtained gba roms on edutools, should also close #316

Summary by CodeRabbit

• New Features

  • Introduced a Game Boy Advance emulator accessible via a new tool in the app.
  • Added a user interface for loading and running GBA ROM files directly in the browser.
  • Included comprehensive English language support and visual styling for the emulator interface.

• Chores

  • Updated environment variable handling for improved configuration flexibility.
  • Simplified the example environment file for easier setup.

• Bug Fixes

  • Improved robustness of environment variable access to prevent issues during development and deployment.

[coderabbitai]

Walkthrough

This change introduces a new Game Boy Advance (GBA) Emulator feature by adding a new game entry and all necessary frontend assets (HTML, CSS, JS, localization, and metadata) to support running a browser-based emulator. It also updates environment variable handling in both configuration and provider logic for improved dynamic loading.

Changes

Cohort / File(s)	Change Summary
GBA Emulator Feature Addition static/_app/tools/gba-emu/index.html, static/_app/tools/gba-emu/data/loader.js, static/_app/tools/gba-emu/data/emulator.min.css, static/_app/tools/gba-emu/data/localization/en-US.json, static/_app/tools/gba-emu/data/cores/reports/mgba.json, static/_app/tools/gba-emu/data/version.json	Adds a complete browser-based GBA emulator UI: HTML loader and UI, dynamic resource loader JS, full emulator CSS, English localization, core report, and version metadata.
Game Entry Update src/lib/gmaes.ts	Adds a new game entry for "GBA Emulator" to the games array, referencing the new emulator UI.
Environment Variable Handling .env.example, vite.config.ts, src/lib/components/providers.svelte	Simplifies .env.example, adds new/updated environment variables, refactors Vite config to inject env variables at build time, and updates Svelte provider logic to use dynamic process.env access with improved error handling and conditional logic.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant Browser
    participant EmulatorLoader (loader.js)
    participant EmulatorJS

    User->>Browser: Open GBA Emulator page (index.html)
    Browser->>User: Display drag-and-drop ROM UI
    User->>Browser: Drop/select ROM file
    Browser->>EmulatorLoader: Determine core, inject loader.js
    EmulatorLoader->>Browser: Dynamically load scripts/styles
    EmulatorLoader->>Browser: Load localization (en-US.json)
    EmulatorLoader->>EmulatorJS: Instantiate emulator with config and ROM
    EmulatorJS-->>User: Render emulator UI and start game

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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~18 minutes

Assessment against linked issues

Objective	Addressed	Explanation
Add a way to play Pokemon Emerald or GBA games via emulator (#316)	✅

Assessment against linked issues: Out-of-scope changes

No out-of-scope changes detected.

Possibly related PRs

• Update gmaes.ts #154: Adds a new game entry "Slope" to the same gmaes.ts array, similar in structure to this PR's addition of "GBA Emulator."
• 222-gmae-request-star-battle #228: Adds a different new game entry to gmaes.ts, modifying the same data structure as this PR.
• add better error handling for importing envs #437: Updates .env.example, src/lib/components/providers.svelte, and vite.config.ts for improved environment variable handling, overlapping with this PR's config/env changes.

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