Update inventory system with unified tab bar and 3D block rendering

[Copilot]

Summary

This PR implements a unified inventory tab bar system across all inventory screens and updates block rendering to use 3D models instead of static 2D images, as requested in the task description.

Changes Made

1. Unified Tab Bar Component

• Created UnifiedInventoryTabBar class to provide consistent navigation across inventory screens
• Tab bar displays three tabs: Items, Craft, and Armor
• Tabs are always visible at the top of inventory screens (as shown in the reference screenshots)
• Selected tab is highlighted with a lighter color from the inventory palette
• Close button positioned consistently at top-right (duplicate close buttons removed)

2. Updated Inventory Screens

• ArmorScreen: Added unified tab bar, removed duplicate header button ("Armor" label)
• IngameBlockSelectionScreen (Items): Added unified tab bar and close button at top
• PaneCraftingScreen: Integrated tab bar while keeping internal category system
• All screens now partially cover background (not fullscreen) for better UX visibility

3. 3D Block Rendering

• Updated ItemRenderer::renderGuiItem() to use 3D block models instead of static 2D textures
• Blocks that support 3D rendering (cubes, stairs, fences, etc.) now display as 3D models
• Falls back to 2D atlas texture rendering for items and non-renderable blocks
• Uses existing renderGuiTile() infrastructure from TileRenderer
• Modular system based on MinecraftConsoles block rendering approach

4. UI Improvements

• Removed all duplicate close buttons across inventory screens
• Consistent tab bar height (24px) and positioning
• Fixed screen scaling - all inventory screens maintain game visibility in background
• Tabs support navigation between inventory sections (Items ↔ Craft ↔ Armor)

Technical Details

Files Created

• UnifiedInventoryTabBar.h/cpp - New unified tab bar component with tab button management

Files Modified

• ItemRenderer.cpp/h - Added 3D block rendering logic with helper function
• ArmorScreen.h/cpp - Integrated tab bar, removed duplicate UI elements
• IngameBlockSelectionScreen.h/cpp - Added tab bar and close button
• PaneCraftingScreen.h/cpp - Integrated tab bar above category buttons
• ChestScreen.h - Header updated for future tab bar support (containers use different UI pattern)

Key Features

• Tab Navigation: Switch between Items, Craft, and Armor sections
• 3D Block Display: Modular block rendering without static textures
• Visual Consistency: Same UI elements and spacing across all screens
• Lightweight Color Highlighting: Selected tabs use lighter color from inventory palette
• Background Visibility: All screens show game behind inventory (not fullscreen overlay)

Code Quality

• Addressed code review feedback:
  • Extracted renderGuiItem3DBlock() helper function to avoid code duplication
  • Replaced magic number 24 with named constant DEFAULT_TAB_BAR_HEIGHT
• Follows existing code patterns and naming conventions
• Maintains compatibility with existing inventory systems

Testing Notes

This project requires Emscripten SDK (WebAssembly build) which is not available in the standard CI environment.

To Test Locally:

1. Run .\install_deps.ps1 to install Emscripten SDK (Windows/PowerShell required)
2. Run .\build.ps1 to compile the WebAssembly build
3. Serve the project/emscripten output folder with a local web server
4. Open the game in a web browser

Verification Checklist:

• Tab switching works between Items/Craft/Armor sections
• Selected tab shows lighter background color
• 3D blocks render correctly in all inventory slots
• Close button appears only once (top-right)
• All screens maintain consistent scaling
• Game is visible in background behind inventory screens
• Tab bar appears on all inventory screens (Items, Armor, Crafting)

Screenshots

Screenshots will be provided after local testing with the WebAssembly build. The changes implement the UI improvements shown in the reference screenshots provided in the task description.

Related Issues

Implements the requirements from the task description:

• ✅ Unified tab bar always visible on all inventory screens
• ✅ Tab labels: Items (default inventory), Craft, Armor
• ✅ Selected tab highlighted with lighter color from inventory palette
• ✅ Duplicate close buttons removed
• ✅ Modular 3D block displays instead of static images
• ✅ Consistent screen scaling (partial background coverage)

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Note: Due to the WebAssembly build requirement, automated testing in CI is not possible. Manual testing on a local Emscripten build is required to verify all functionality.