fix(ui): correct mount point selection pre-fill and simplify partition creation dialog

iridium_installer/ui/pages/partitioning.py

@@ -474,6 +474,13 @@ class PartitioningPage(Adw.Bin):
 
         options = ["/", "/boot/efi", "[SWAP]", "None"]
         dropdown = Gtk.DropDown.new_from_strings(options)
+        
+        current_mp = data.get("mount_point")
+        if current_mp in options:
+            dropdown.set_selected(options.index(current_mp))
+        elif not current_mp:
+            dropdown.set_selected(options.index("None"))
+        
         box.append(Gtk.Label(label=f"Mount point for {data['name']}:"))
         box.append(dropdown)
 
@@ -519,24 +526,6 @@ class PartitioningPage(Adw.Bin):
         box.append(Gtk.Label(label="Partition Type:"))
         box.append(type_dropdown)
 
-        # Filesystem dropdown
-        fs_options = ["ext4", "fat32", "swap"]
-        fs_dropdown = Gtk.DropDown.new_from_strings(fs_options)
-        box.append(Gtk.Label(label="Filesystem:"))
-        box.append(fs_dropdown)
-
-        # Auto-update FS based on Type
-        def on_type_changed(dropdown, pspec):
-            selected_type = type_names[dropdown.get_selected()]
-            if selected_type == "EFI System":
-                fs_dropdown.set_selected(1) # fat32
-            elif selected_type == "Swap":
-                fs_dropdown.set_selected(2) # swap
-            else:
-                fs_dropdown.set_selected(0) # ext4
-
-        type_dropdown.connect("notify::selected", on_type_changed)
-
         error_label = Gtk.Label(label="")
         error_label.add_css_class("error")
         box.append(error_label)
@@ -545,13 +534,16 @@ class PartitioningPage(Adw.Bin):
             from ...backend.disk import create_partition
             selected_type = type_names[type_dropdown.get_selected()]
             
-            # Default name based on type
+            # Default name and fstype based on type
             if selected_type == "EFI System":
                 name = "EFI System"
+                fstype = "fat32"
             elif selected_type == "Swap":
                 name = "Swap"
+                fstype = "swap"
             else:
                 name = "Linux filesystem"
+                fstype = "ext4"
 
             size_text = size_entry.get_text()
             try:
@@ -564,7 +556,6 @@ class PartitioningPage(Adw.Bin):
                 return
 
             type_code = types[selected_type]
-            fstype = fs_options[fs_dropdown.get_selected()]
             
             try:
                 create_partition(self.current_disk_path, size_mb, type_code, name, fstype)