Rename "Structure" object type to "Solid"

[Copilot]

Global rename of the "Structure" object type to "Solid" across the entire codebase.

Types & Enums

• ObjectType_Structure → ObjectType_Solid
• struct Structure → struct Solid, StructureTO → SolidTO, StructureDesc → SolidDesc
• DetectStructure* → DetectSolid*, ReconnectStructure* → ReconnectSolid* (all TO/Desc/Genome/GenomeTO/GenomeDesc variants)
• SensorMode_DetectStructure → SensorMode_DetectSolid
• ReconnectorMode_Structure → ReconnectorMode_Solid

Members & Methods

• ObjectTypeData::structure → ObjectTypeData::solid
• getStructureRef() → getSolidRef()
• Local variables: structureDesc → solidDesc, detectStructure → detectSolid, reconnectStructure → reconnectSolid

UI Labels

• "Structure" → "Solid", "Detect structure" → "Detect solid" in ObjectTypeStrings, SensorModeStrings, ReconnectorModeStrings, tab items, tooltips

// Before
union ObjectTypeData {
    Structure structure;
    Fluid fluid;
    ...
};

// After
union ObjectTypeData {
    Solid solid;
    Fluid fluid;
    ...
};

Generic English uses of "structure" (e.g. "genome structure", "spatial structure size") are intentionally unchanged. 45 files, 330 symmetric insertions/deletions.

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