Rename SolveCraft to SolidCraft everywhere, with compatibility shims (#389)

* WIP deep rename (not for push)

* WIP2

* WIP3

* WIP4 wxs fix

* rustfmt

* Rename the remaining identifiers in merged crash-report code

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT

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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

packaging/macos/README.txt

@@ -11,4 +11,6 @@ Some earlier releases were installed as SolveCraft.app. Move that one to the Tra
 once SolidCraft.app is in Applications, and replace any Dock shortcut with the
 old name (open SolidCraft.app, then choose Options > Keep in Dock).
 
-Your designs and settings are not affected by the update.
+Designs saved as .solvecraft still open, and SolidCraft copies your settings
+and recovery files from the old SolveCraft folder on its first launch.
+New designs are saved as .solidcraft.