feat: add EXE projects with versioned install configuration

- EXE project kind next to MSIX: formats.exe, new EXE projects, EXE app
  info (architecture, UpgradeCode), per-kind workspace; EXE builds and
  signing are still refused explicitly (#9).
- Install configuration tabs: registry grid, shortcuts and installer
  properties with formatted-text checks (#10).
- Per-version .isver files: version list, add dialog, lock/unlock,
  delete with .isver.bak backups, description (#11).
- Major/patch versions with cumulative patch checks and automatic kind
  selection (#12).
- 설치화면 tab: setup steps, theme and scripts per version (#13).
- Preferences: theme and display language (#14).
- 설치파일 tab as an Explorer-style tree: per-row add/remove, Windows
  folder install locations (FileRule.targetRoot), picked files placed
  with FileRule.sourceFolder, unsaved-rule file preview (#17).

Checks: cargo fmt/clippy/test, 82 frontend tests, Vite build and the
msix-studio build pass. npm ci, GUI click tests and real EXE builds were
not run.

Refs #9 #10 #11 #12 #13 #14 #17

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitignore

@@ -9,6 +9,7 @@
 *.isproj.local.json
 *.isproj.bak
 *.isproj.local.json.bak
+*.isver.bak
 
 # Build dependencies and temporary files
 node_modules/