Dock: flush title bars and a vertical title bar for floating panels

Every docked panel now shows its title bar flush along the top, like the
Properties panel: dock::frame takes the title bar separately and pads
only the content below it.

A floating panel drops its horizontal title bar for a vertical one on
the side facing the nearer workspace edge. Close and the auto-hide pin
sit at the top; the panel's icon sits at the bottom with the title
reading upward above it. The free part of the bar drags the panel. With
auto-hide on, a floating panel shrinks to its title bar until hovered.

Panel views take a dock::Chrome (auto-collapse plus floating) in place
of the bare auto-collapse flag, so the shared title bar knows when to
step aside.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013RyGiMXcsf9HTKfqDxaQGt

src/ui/window/block_palette.rs

@@ -659,8 +659,8 @@ fn options_card<'a>(palette: &'a BlockPalette) -> Element<'a, Message> {
 }
 
 /// Build the docked panel element from the palette state.
-pub fn view(palette: &BlockPalette, width: f32, auto_collapse: bool) -> Element<'_, Message> {
-    let title_bar = crate::ui::dock::title_bar(PanelId::BlockPalette, crate::t!("Blocks").into_owned(), auto_collapse);
+pub fn view(palette: &BlockPalette, width: f32, chrome: crate::ui::dock::Chrome) -> Element<'_, Message> {
+    let title_bar = crate::ui::dock::title_bar(PanelId::BlockPalette, crate::t!("Blocks").into_owned(), chrome);
 
     let tabs = {
         let buttons = [Tab::Current, Tab::Recent, Tab::Favorites, Tab::Libraries].map(|t| {
@@ -801,7 +801,7 @@ pub fn view(palette: &BlockPalette, width: f32, auto_collapse: bool) -> Element<
             .into()
     };
 
-    crate::ui::dock::frame(column![title_bar, top, body, options_card(palette)].spacing(6), width)
+    crate::ui::dock::frame(title_bar, column![top, body, options_card(palette)].spacing(6), width)
 }
 
 /// Width of the ribbon's block gallery.

src/ui/window/browser.rs

@@ -97,10 +97,10 @@ pub fn view<'a>(
     document: &'a CadDocument,
     open_sketch: Option<&'a str>,
     width: f32,
-    auto_collapse: bool,
+    chrome: crate::ui::dock::Chrome,
 ) -> Element<'a, Message> {
     let title_bar =
-        crate::ui::dock::title_bar(PanelId::Browser, crate::t!("Browser").into_owned(), auto_collapse);
+        crate::ui::dock::title_bar(PanelId::Browser, crate::t!("Browser").into_owned(), chrome);
 
     let mut tree = column![].spacing(1);
 
@@ -143,5 +143,5 @@ pub fn view<'a>(
     .width(Fill)
     .height(Fill);
 
-    crate::ui::dock::frame(column![title_bar, body].spacing(6), width)
+    crate::ui::dock::frame(title_bar, column![body].spacing(6), width)
 }

src/ui/window/count_palette.rs

@@ -530,9 +530,9 @@ pub fn view<'a>(
     doc_id: u64,
     epoch: u64,
     width: f32,
-    auto_collapse: bool,
+    chrome: crate::ui::dock::Chrome,
 ) -> Element<'a, Message> {
-    let title_bar = crate::ui::dock::title_bar(PanelId::Count, crate::t!("Count").into_owned(), auto_collapse);
+    let title_bar = crate::ui::dock::title_bar(PanelId::Count, crate::t!("Count").into_owned(), chrome);
     let body = match mode {
         Some(mode) if mode.target.is_some() => mode_view(palette, mode, doc),
         _ => {
@@ -550,7 +550,7 @@ pub fn view<'a>(
             list_view(palette, &instances)
         }
     };
-    crate::ui::dock::frame(column![title_bar, body].spacing(6), width)
+    crate::ui::dock::frame(title_bar, column![body].spacing(6), width)
 }
 
 fn bar_button<'a>(icon: Element<'a, Message>, tip: String, m: Option<CountMsg>) -> Element<'a, Message> {

src/ui/window/pc_manager.rs

@@ -235,10 +235,10 @@ pub fn view<'a>(
     document: &'a CadDocument,
     selected: &[Handle],
     width: f32,
-    auto_collapse: bool,
+    chrome: crate::ui::dock::Chrome,
 ) -> Element<'a, Message> {
     let title_bar =
-        crate::ui::dock::title_bar(PanelId::PointCloudManager, crate::t!("Point Cloud Manager").into_owned(), auto_collapse);
+        crate::ui::dock::title_bar(PanelId::PointCloudManager, crate::t!("Point Cloud Manager").into_owned(), chrome);
     let query = state.search.trim().to_lowercase();
     let matches = |label: &str| query.is_empty() || label.to_lowercase().contains(&query);
     // Searching opens every node so the matches show.
@@ -354,5 +354,5 @@ pub fn view<'a>(
         .padding([4, 8])
         .size(12);
 
-    crate::ui::dock::frame(column![title_bar, card, search].spacing(6), width)
+    crate::ui::dock::frame(title_bar, column![card, search].spacing(6), width)
 }

src/ui/window/sheet_set.rs

@@ -936,9 +936,9 @@ fn heading(label: &str) -> Element<'static, Message> {
         .into()
 }
 
-pub fn view<'a>(state: &'a SheetSetManager, width: f32, auto_collapse: bool) -> Element<'a, Message> {
+pub fn view<'a>(state: &'a SheetSetManager, width: f32, chrome: crate::ui::dock::Chrome) -> Element<'a, Message> {
     let title_bar =
-        crate::ui::dock::title_bar(PanelId::SheetSetManager, t!("Sheet Set Manager").into_owned(), auto_collapse);
+        crate::ui::dock::title_bar(PanelId::SheetSetManager, t!("Sheet Set Manager").into_owned(), chrome);
     let mut picks: Vec<Pick> =
         state.sets.iter().enumerate().map(|(i, db)| Pick(Some(i), db.name().to_string())).collect();
     picks.push(Pick(None, t!("Open...").into_owned()));
@@ -1040,7 +1040,7 @@ pub fn view<'a>(state: &'a SheetSetManager, width: f32, auto_collapse: bool) ->
     let hint = text(t!("Double-click opens a sheet. Right-click for more commands.").into_owned())
         .size(10)
         .style(muted_style);
-    crate::ui::dock::frame(column![title_bar, combo, tabs, card, hint].spacing(6), width)
+    crate::ui::dock::frame(title_bar, column![combo, tabs, card, hint].spacing(6), width)
 }
 
 // ── dialogs ──────────────────────────────────────────────────────────────────

src/ui/window/xref_manager.rs

@@ -542,7 +542,7 @@ impl XrefManagerPanel {
     pub fn view<'a>(
         &'a self,
         width: f32,
-        auto_collapse: bool,
+        chrome: crate::ui::dock::Chrome,
         missing: usize,
         doc: &'a CadDocument,
     ) -> Element<'a, Message> {
@@ -550,7 +550,7 @@ impl XrefManagerPanel {
         let title_bar = crate::ui::dock::title_bar(
             PanelId::ExternalReferences,
             format!("{} ({})", crate::t!("External References").as_ref(), self.entries.len()),
-            auto_collapse,
+            chrome,
         );
         // Table content width: column widths plus gutters, stretched to the
         // dock when wider so rows fill the panel; narrower docks sidescroll.