6a317a52b195dac0596c81c7b1dc17357a868a81
Implements REQ-UI-ITEM-ICON and REQ-UI-RECIPE-ICON. Adds an optional recipes.toml `icon` field (an item id; defaults to the recipe's first output). New ItemIconCache loads per-item SVGs from icons/items and caches pixmaps per target pixel size, shared by: - the Miner/Assembler recipe-selection dialog, which now shows icon-only option buttons (name-caption fallback when no icon file exists), and - GameWorldView belt/port item rendering via a shared drawWorldItem helper (colored-square fallback preserved). Shipyard schematic dialog is unchanged. No icon art is shipped; every path falls back cleanly when an item has no SVG. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Y7N59FsLA5e2kuVdqe4Uhc
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