feat: configure sidebar min/max width via [ui] (#135)

* feat: configure sidebar min/max width via [ui]

Expose the previously hardcoded MIN_SIDEBAR_WIDTH / MAX_SIDEBAR_WIDTH
clamps as [ui] sidebar_min_width / sidebar_max_width. Defaults remain
18 / 36 so existing configs are unchanged. Hot-reload is wired through
the existing [ui] block; reload re-clamps the live width to the new
bounds so tightening takes effect immediately.

Reject inverted bounds (min > max) at every entry point so a bad config
can never reach u16::clamp(min, max), which panics: App::new falls back
to defaults, and apply_live_config treats the whole [ui] section as
invalid and returns a partial reload report.

refs #132

* test: keep sidebar reload width within bounds

refs #132

---------

Co-authored-by: Ogulcan Celik <ogulcancelik@gmail.com>

1 files changed, 23 insertions, 2 deletions

diff --git a/src/app/input/sidebar.rs b/src/app/input/sidebar.rs
index e8e1e094..94feaf93 100644
--- a/src/app/input/sidebar.rs
+++ b/src/app/input/sidebar.rs
@@ -244,8 +244,7 @@ impl AppState {
     pub(super) fn set_manual_sidebar_width(&mut self, divider_col: u16) {
         let sidebar = self.view.sidebar_rect;
         let width = divider_col.saturating_sub(sidebar.x).saturating_add(1);
-        self.sidebar_width =
-            width.clamp(crate::ui::MIN_SIDEBAR_WIDTH, crate::ui::MAX_SIDEBAR_WIDTH);
+        self.sidebar_width = width.clamp(self.sidebar_min_width, self.sidebar_max_width);
         self.sidebar_width_source = crate::app::state::SidebarWidthSource::Manual;
         self.mark_session_dirty();
     }
@@ -1240,6 +1239,28 @@ mod tests {
     }
 
     #[test]
+    fn dragging_past_max_clamps_to_configured_max() {
+        let mut app = app_for_mouse_test();
+        app.state.sidebar_max_width = 30;
+
+        app.handle_mouse(mouse(MouseEventKind::Down(MouseButton::Left), 25, 5));
+        app.handle_mouse(mouse(MouseEventKind::Drag(MouseButton::Left), 50, 5));
+
+        assert_eq!(app.state.sidebar_width, 30);
+    }
+
+    #[test]
+    fn dragging_below_min_clamps_to_configured_min() {
+        let mut app = app_for_mouse_test();
+        app.state.sidebar_min_width = 22;
+
+        app.handle_mouse(mouse(MouseEventKind::Down(MouseButton::Left), 25, 5));
+        app.handle_mouse(mouse(MouseEventKind::Drag(MouseButton::Left), 5, 5));
+
+        assert_eq!(app.state.sidebar_width, 22);
+    }
+
+    #[test]
     fn dragging_sidebar_section_divider_sets_split_ratio() {
         let mut app = app_for_mouse_test();
         let divider = crate::ui::sidebar_section_divider_rect(