Rename the Demolish* terminology to Deconstruct* across the simulation, events, UI, tests, and docs (DemolishCommand and the DemolishMode* events become their Deconstruct* equivalents), aligning with the deconstruction queue at HEAD. Add per-building SVG icons for the build button grid (REQ-UI-BUILD-GRID): one color-chip icon per placeable building under data/icons/buildings, loaded from disk at runtime and rendered with QtSvg onto each build button. An unaffordable building's button shows a grey-recolored variant via a QIcon Disabled-mode pixmap (REQ-UI-BUILD-DISABLED). Adds the Qt5::Svg dependency and deploys Qt5Svg.dll. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Y7N59FsLA5e2kuVdqe4Uhc
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