Move preferences from the database to a YAML config file

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/app/view.rs

@@ -64,7 +64,7 @@ impl App {
 
     fn main_view(&self) -> Element<'_, Message> {
         let mut body = row![].width(Length::Fill).height(Length::Fill);
-        if !self.preferences.sidebar_collapsed {
+        if !self.config.interface.sidebar_collapsed {
             body = body.push(self.sidebar());
             body = body.push(
                 mouse_area(
@@ -272,7 +272,8 @@ impl App {
             .spacing(10),
         )
         .width(
-            self.preferences
+            self.config
+                .interface
                 .sidebar_width
                 .clamp(MIN_SIDEBAR_WIDTH, MAX_SIDEBAR_WIDTH) as f32,
         )
@@ -327,10 +328,11 @@ impl App {
             .style(button::text);
         // Center the tabs over the detail area, not the whole window, so the
         // sidebar's width (plus its divider) shifts them along.
-        let detail_offset = if self.preferences.sidebar_collapsed {
+        let detail_offset = if self.config.interface.sidebar_collapsed {
             0.0
         } else {
-            self.preferences
+            self.config
+                .interface
                 .sidebar_width
                 .clamp(MIN_SIDEBAR_WIDTH, MAX_SIDEBAR_WIDTH) as f32
                 + 5.0