fix: correct WSL detection and improve platform-specific configuration

- Set WSL detection to false by default for proper conditional evaluation
- Add delta as diff pager for improved git diff output
- Change Windows cd command from nu to powershell.exe with -NoLogo flag
- Refactor .chezmoiignore to use clearer platform-specific sections
- Fix WSL-only files to be properly excluded on non-WSL systems
- Separate Linux/Unix and Windows file exclusions for better clarity
- Remove zsh profile from Cursor settings (migrated to Fish shell)

home/.config-source/cursor/settings.windows.json

@@ -34,9 +34,6 @@
       "path": "bash",
       "icon": "terminal-bash"
     },
-    "zsh": {
-      "path": "zsh"
-    },
     "fish": {
       "path": "fish"
     },