Release under the SolidCraft name: binaries, assets and installers (#383)

* Release under the SolidCraft name: binaries, assets and installers

The desktop binary is now `solidcraft` and the CLI `solidcraft-cli` (the two app packages
are renamed; their folders move with the rest of the rename later). Every release asset is
named solidcraft-<ver>-… / SolidCraft-<ver>-windows-x64.exe, and the installers show the
SolidCraft product name.

Kept so existing installs keep updating (docs/compatibility.md):
- `solvecraft-cli` alias binary in every package, forwarding to solidcraft-cli with a
  deprecation note on stderr (tests/legacy_alias.rs).
- Linux app ID ai.storyteller.solvecraft (Flatpak ID, desktop entry, Wayland app_id).
- MSI UpgradeCode, so the MSI upgrades in place.
- deb Replaces/Conflicts/Provides and rpm Obsoletes/Provides solvecraft.
- An old-named .zsync copy so earlier AppImages find updates; a legacy .flatpakrepo copy.
- .solvecraft file associations; SOLVECRAFT_* fallbacks in the packaging scripts.

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

* MSI: register the legacy .solvecraft extension without a duplicate open verb

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

---------

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

packaging/macos/Info.plist.in

@@ -13,7 +13,7 @@
   <key>CFBundleExecutable</key>
   <string>SolidCraft</string>
   <key>CFBundleIdentifier</key>
-  <string>ai.storyteller.solvecraft</string>
+  <string>ai.storyteller.solidcraft</string>
   <key>CFBundleInfoDictionaryVersion</key>
   <string>6.0</string>
   <key>CFBundlePackageType</key>
@@ -24,7 +24,7 @@
   <string>@SHORT_VERSION@</string>
   <key>CFBundleVersion</key>
   <string>@SHORT_VERSION@</string>
-  <key>SolveCraftVersion</key>
+  <key>SolidCraftVersion</key>
   <string>@VERSION@</string>
   <key>CFBundleIconFile</key>
   <string>SolidCraft</string>
@@ -43,7 +43,8 @@
       <key>CFBundleTypeName</key>
       <string>SolidCraft design</string>
       <key>CFBundleTypeExtensions</key>
-      <array><string>solvecraft</string></array>
+      <!-- solvecraft: designs saved before the rename (compatibility shim, docs/compatibility.md). -->
+      <array><string>solidcraft</string><string>solvecraft</string></array>
       <key>CFBundleTypeRole</key>
       <string>Editor</string>
       <key>LSHandlerRank</key>