Add save game editor (#12)

* WIP

* stuff

* WIP: Interactive 3D score cube for save editor

* Conditionally render ScoreCube to properly clean up WebGL canvas

Only mount the ScoreCube component when on the save-editor page.
This ensures onDestroy is called when navigating away, properly
disposing of the WebGL renderer and removing the canvas from DOM.

* Refactor: Consolidate formats and genericize WDB rendering

- Move parsing/serialization code to src/core/formats/:
  - BinaryReader.js, BinaryWriter.js (shared utilities)
  - SaveGameParser.js, SaveGameSerializer.js
  - PlayersParser.js, PlayersSerializer.js
  - Create formats/index.js as barrel export

- Extract generic WdbModelRenderer from ScoreCubeRenderer:
  - WdbModelRenderer handles D3DRM geometry and paletted textures
  - ScoreCubeRenderer extends it with score-specific logic
  - Prepares for rendering other WDB models in the future

- Keep savegame/constants.js for domain-specific constants
- savegame/index.js remains as high-level API facade

* Save editor UI improvements

- Make save slot cards fixed width (85px) to prevent resizing with name length
- Make save slot cards more compact (smaller icons, padding, font)
- Remove Act selection from Character section
- Remove box-shadow from selected character to fix collapsed section bleed

* Improve score cube lighting to match in-game appearance

- Use flat, even lighting (high ambient + soft front light)
- Remove harsh directional shadows from edges
- Adjust camera position slightly for better framing

* Add spacing below score cube canvas

* Add spinning loader while loading score cube

* Update three.js to 0.182.0 and fix npm audit issues

- Update three.js from 0.170.0 to 0.182.0
- Fix npm audit vulnerabilities (devalue, lodash, svelte)
- Remaining vulns are in dev dependencies (vite, workbox-cli)

* Fix score cube overflow on mobile

Add max-width constraints to prevent the score cube from expanding
its container on narrow viewports while preserving its natural
200x200 size on desktop.

* Add save slot carousel and improve empty states

- Add reusable Carousel component with arrow navigation, drag-to-scroll,
  and click-to-scroll-into-view functionality
- Replace static save slot list with horizontal carousel
- Add empty state with image when no save files exist
- Add prompt state when saves exist but none is selected
- Reset selected slot when entering Save Editor page

* Add February 2026 changelog entry for Save Editor

* Add missing January 2026 changelog entries for Safari and mobile fixes

* Remove unused mission images

* Refactor opfs.js to reduce code duplication

- Consolidate getFileHandle to use getOpfsRoot internally
- Add writeTextFile helper that uses writeBinaryFile
- Extract showToast helper for toast notifications
- Simplify saveConfig to use writeTextFile instead of duplicate worker
- Simplify fileExists and readBinaryFile to use getFileHandle

* Remove unused ScoreColorButton component

* Remove unused UI components

Author: foxtacles

package-lock.json

@@ -10,6 +10,9 @@
     "preview": "vite preview",
     "prepare:assets": "node scripts/prepare.js"
   },
+  "dependencies": {
+    "three": "^0.182.0"
+  },
   "devDependencies": {
     "@sveltejs/vite-plugin-svelte": "^4.0.0",
     "svelte": "^5.0.0",