fix(prefix): restructure full_setup — purge first, then Proton, then pre-build prefix for winetricks

Bug: full_setup installed Proton THEN called purge(), which now removes Proton; all six launcher installs failed with 'Proton not found'.

New order: stash data → purge (prefix + Proton) → install latest Proton → pre-build pfx with 'proton run cmd.exe /c exit' → init (winetricks now runs — prefix exists) → backup → install launchers → restore stash.

The no-op cmd.exe run creates $WINEPREFIX/pfx/drive_c/windows/system32 so _install_winetricks_verbs is no longer skipped during init. This means vcrun/d3dx/cacerts/etc are installed before any launcher, giving every installer a properly prepared prefix.

Author: xaoscience

lib/prefix.sh

@@ -323,25 +323,32 @@ _install_with_fallback() {
     fi
 }
 
-# Full setup: purge → init → install all launchers.
+# Full setup: purge → fresh Proton → pre-build prefix → init (verbs) → install all launchers.
 full_setup() {
     print_info "Running full setup..."
 
-    # One-click: install GE-Proton automatically if not present.
-    if [ ! -x "$PROTON_DIR/proton" ]; then
-        print_info "GE-Proton not found — installing latest automatically..."
-        install_proton latest || { print_error "GE-Proton install failed; cannot continue."; return 1; }
-    fi
-
-    # If a prefix already exists, back up launcher sessions before wiping.
+    # Stash launcher data before purge removes the prefix.
     local _had_data=0
     if [ -d "$WINEPREFIX/pfx/drive_c" ]; then
         print_info "Preserving launcher data before purge (instant move — no compression)..."
         _stash_launcher_data && _had_data=1 || true
     fi
 
-    purge
-    WIG_BULK=1 init "$@"
+    purge   # removes prefix AND existing GE-Proton installation
+
+    # Always install latest GE-Proton after a full purge.
+    install_proton latest || { print_error "GE-Proton install failed; cannot continue."; return 1; }
+
+    # Pre-build the Proton prefix ($WINEPREFIX/pfx) with a no-op so that
+    # winetricks can install verbs before any real launcher installer runs.
+    print_warning "Building Proton prefix (no op command)..."
+    mkdir -p "$WINE_DIR/steam-root" "$WINEPREFIX"
+    STEAM_COMPAT_DATA_PATH="$WINEPREFIX" \
+    STEAM_COMPAT_CLIENT_INSTALL_PATH="$WINE_DIR/steam-root" \
+    PROTON_LOG=0 \
+        "$PROTON_DIR/proton" run cmd.exe /c exit >/dev/null 2>&1 || true
+
+    WIG_BULK=1 init "$@"    # winetricks verbs run here — prefix now exists
     backup
 
     print_info "Installing all registered launchers..."
@@ -369,12 +376,6 @@ full_setup() {
         _unstash_launcher_data || true
     fi
 
-    # Prefix was built by the first launcher install above — now verbs can run.
-    if [ -d "$WINEPREFIX/pfx/drive_c/windows/system32" ]; then
-        print_info "Installing winetricks verbs..."
-        _install_winetricks_verbs
-    fi
-
     print_success "Full setup complete"
 }