Document BIM Wall unsupported base handling

[slendertaker]

Summary

• add a BIM release note for unsupported BIM Wall base-object handling
• document that unsupported base edge types are filtered and warn instead of producing tracebacks when no supported edges are available
• update both root and English release-note pages

Verification

• git diff --check upstream/main..HEAD

Source: FreeCAD/FreeCAD#29810

AI-assisted with OpenAI Codex; I reviewed the final diff before submitting.

[Reqrefusion]

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