chore: refactor GameApp.ts into parts

SESSION.md

@@ -4,6 +4,8 @@
 
 This repository now contains a playable Three.js/Vite prototype for a space RTS / economy sim testbed inspired by EVE Online and X4.
 
+The codebase has been refactored away from a single monolithic `GameApp.ts` toward a more maintainable, data-driven structure. Authored game content now lives in JSON catalogs, while runtime code is split into domain types, world-building helpers, UI presenters, and rendering helpers.
+
 The current prototype includes:
 
 - Two solar systems: `Helios Reach` and `Perseus Gate`
@@ -74,12 +76,14 @@ The current prototype includes:
   - `container`
   - `manufactured`
 - Added module categories and starter module definitions for ships/stations
+- Added explicit recipe data for refinery processing
 - Ships and stations now expose compatible cargo/storage/module metadata
 - Refineries track:
   - ore stored
   - active refining batch
   - refining timer
   - refined output stock
+- Refinery processing now consumes ore inventory and produces manufactured output through a recipe-driven flow
 
 ### Energy / Fuel
 
@@ -144,6 +148,22 @@ The current prototype includes:
   - Vite
   - TypeScript
   - Three.js
+- Authored data now lives in JSON files under `src/game/data/`, including:
+  - `items.json`
+  - `recipes.json`
+  - `systems.json`
+  - `modules.json`
+  - `ships.json`
+  - `constructibles.json`
+  - `scenario.json`
+  - `balance.json`
+- Shared domain and runtime types now live in `src/game/types.ts`
+- World construction is extracted into `src/game/world/worldFactory.ts`
+- HUD creation and presentation logic are extracted into:
+  - `src/game/ui/hud.ts`
+  - `src/game/ui/presenters.ts`
+  - `src/game/ui/strategicRenderer.ts`
+- Inventory helpers now live in `src/game/state/inventory.ts`
 - High-level symbology is rendered through a dedicated 2D HUD overlay canvas layered above the 3D scene
 - Production build is currently passing with `npm run build`
 
@@ -160,6 +180,9 @@ The current prototype includes:
 
 ## Suggested Next Steps
 
+- Continue shrinking `GameApp.ts` by extracting simulation/order logic into dedicated gameplay systems once the current rules stabilize
+- Add JSON schema validation or runtime validation for the authored data catalogs to catch content errors earlier
+- Move constructible placement and future unit spawning onto a shared scenario/entity factory pipeline
 - Introduce explicit orbital anchors for:
   - stars
   - planets