fix(games): let the GUI Add-game dialog link a launcher & log folder

The "Add game…" button only prompted for a name (single-field QInputDialog), so a
custom game couldn't be given its launch command or log dir from the GUI. Replace it
with a proper dialog: name + an optional launch command/script (with a file browser)
+ an optional log folder (auto-detected from the script's folder when left blank).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/rigdoctor/gui/games_page.py

@@ -430,19 +430,78 @@ class GamesPage(QWidget):
         self._banner.hide()
 
     def _add_custom_game(self) -> None:
-        """Manually add a game no launcher reports (e.g. SPT), then rescan to show it."""
-        from PySide6.QtWidgets import QInputDialog
-
+        """Manually add a game no launcher reports (e.g. SPT): name + an optional launch
+        command/script (so it can be launched under crash-capture) and log folder."""
         from ..core import customgames
 
-        name, ok = QInputDialog.getText(
-            self, "Add game", "Game name (e.g. SPT) — for titles no launcher reports:")
-        if not ok:
+        dlg = QDialog(self)
+        dlg.setWindowTitle("Add game")
+        dlg.setMinimumWidth(560)
+        v = QVBoxLayout(dlg)
+        v.setContentsMargins(20, 18, 20, 16)
+        v.setSpacing(10)
+
+        intro = QLabel(
+            "Add a game no launcher reports — a standalone mod launcher like SPT, an itch.io "
+            "download, or any hand-installed game.")
+        intro.setWordWrap(True)
+        v.addWidget(intro)
+
+        name_edit = QLineEdit()
+        name_edit.setPlaceholderText("SPT")
+        v.addWidget(QLabel("Game name"))
+        v.addWidget(name_edit)
+
+        cmd_edit = QLineEdit()
+        cmd_edit.setPlaceholderText("e.g. /run/media/.../Escape-From-Tarkov/tarkov.sh")
+        cmd_row = QHBoxLayout()
+        cmd_row.addWidget(cmd_edit, 1)
+        cmd_browse = QPushButton("Browse…")
+        cmd_row.addWidget(cmd_browse, 0)
+        v.addWidget(QLabel("Launch command / script (optional — enables launch + auto-capture)"))
+        v.addLayout(cmd_row)
+
+        log_edit = QLineEdit()
+        log_edit.setPlaceholderText("auto-detected from the script's folder (its logs/ subfolder)")
+        log_row = QHBoxLayout()
+        log_row.addWidget(log_edit, 1)
+        log_browse = QPushButton("Browse…")
+        log_row.addWidget(log_browse, 0)
+        v.addWidget(QLabel("Log folder (optional — read into crash diagnostics)"))
+        v.addLayout(log_row)
+
+        def _pick_command() -> None:
+            path, _ = QFileDialog.getOpenFileName(dlg, "Select the launch script/executable")
+            if path:
+                cmd_edit.setText(path)
+
+        def _pick_logdir() -> None:
+            path = QFileDialog.getExistingDirectory(dlg, "Select the game's log folder")
+            if path:
+                log_edit.setText(path)
+
+        cmd_browse.clicked.connect(_pick_command)
+        log_browse.clicked.connect(_pick_logdir)
+
+        buttons = QHBoxLayout()
+        buttons.addStretch(1)
+        cancel = QPushButton("Cancel")
+        cancel.clicked.connect(dlg.reject)
+        buttons.addWidget(cancel)
+        add = QPushButton("Add")
+        add.setObjectName("PrimaryButton")
+        add.setDefault(True)
+        add.clicked.connect(dlg.accept)
+        buttons.addWidget(add)
+        v.addLayout(buttons)
+
+        if dlg.exec() != QDialog.DialogCode.Accepted:
             return
-        name = name.strip()
+        name = name_edit.text().strip()
         if not name:
             return
-        if customgames.add(name):
+        if customgames.add(name, command=cmd_edit.text().strip() or None,
+                           logdir=log_edit.text().strip() or None):
             self.refresh()
         else:
             QMessageBox.information(self, "Add game", f"'{name}' is already in your games.")