Validate sourced physical material property cards and elastic stability (#934)

Adds the read-only material.properties.validate command: schema_version 1 engineering material cards in SI units are checked for numerical consistency and elastic stability, with derived isotropic moduli, missing conditions and sources needing review. Nothing is assigned or saved.

Thanks @0xlillith.

assets/locales/en.json

@@ -956,5 +956,6 @@
   "Letter Spacing": "Letter Spacing",
   "Line Spacing": "Line Spacing",
   "Path": "Path",
-  "sketch_text.on_path": "The text follows its path: the curve places it"
+  "sketch_text.on_path": "The text follows its path: the curve places it",
+  "cmd.material_properties_validate":"Validate Physical Material Data"
 }

assets/locales/ja.json

@@ -956,5 +956,6 @@
   "Letter Spacing": "文字間隔",
   "Line Spacing": "行間",
   "Path": "パス",
-  "sketch_text.on_path": "文字はパスに沿います: 位置は曲線で決まります"
+  "sketch_text.on_path": "文字はパスに沿います: 位置は曲線で決まります",
+  "cmd.material_properties_validate":"物理材料データを検証"
 }

assets/locales/zh.json

@@ -956,5 +956,6 @@
   "Path": "路径",
   "sketch_text.on_path": "文字沿路径排列：由曲线放置",
   "ui.analysis": "分析",
-  "ui.edit_section_analysis": "编辑截面分析"
+  "ui.edit_section_analysis": "编辑截面分析",
+  "cmd.material_properties_validate":"验证物理材料数据"
 }