fix(ui): refine command line and clipboard

- preserve command history colors after reopening
- remove collapsed command bar residue and split the unsaved prompt
- read system text when the drawing clipboard is empty

Refs #467
Refs #468
Refs #470

src/app/commands/blocks.rs

@@ -193,7 +193,7 @@ impl OpenCADStudio {
 
             "PASTECLIP" => {
                 if self.clipboard.is_empty() {
-                    self.command_line.push_error(crate::t!("Clipboard is empty.").as_ref());
+                    return Some(self.read_system_clipboard_for_paste());
                 } else {
                     let wires = self.tabs[i].scene.wires_for_entities(&self.clipboard);
                     let base = self.clipboard_base;

src/app/mod.rs

@@ -1586,10 +1586,11 @@ pub enum Message {
         crate::scene::text::web_font::Script,
         Result<(), String>,
     ),
-    /// Ctrl+V. Routed by `update`: into the open text/MText editor (via an async
-    /// system-clipboard read, which is the only paste path that works on the
-    /// web) or, with no editor open, the entity paste command.
+    /// Ctrl+V. Routed by `update` into an open text editor, the drawing-object
+    /// clipboard, or the system text clipboard.
     PasteShortcut,
+    /// Completion of a system text clipboard read requested by PASTECLIP.
+    SystemClipboardPaste(SystemClipboardText),
     /// Ctrl/Cmd+A — select all layer rows when the Layer Manager is open, or all
     /// drawing objects otherwise (#236).
     SelectAllShortcut,
@@ -2791,6 +2792,15 @@ pub enum Message {
     ),
 }
 
+#[derive(Debug, Clone)]
+pub enum SystemClipboardText {
+    Text(String),
+    EmptyOrUnsupported,
+    Unavailable,
+    Occupied,
+    ConversionFailed,
+}
+
 impl OpenCADStudio {
     /// Install the Start-page video list, decoding each thumbnail's JPEG into
     /// an image Handle exactly once (a fresh Handle per view frame would

src/app/update/command.rs

@@ -1259,7 +1259,44 @@ pub(super) fn on_tab_close(&mut self, idx: usize) -> Task<Message> {
                     #[cfg(not(target_arch = "wasm32"))]
                     return Task::none();
                 }
-                Task::done(Message::Command("PASTECLIP".to_string()))
+                if self.clipboard.is_empty() {
+                    self.read_system_clipboard_for_paste()
+                } else {
+                    Task::done(Message::Command("PASTECLIP".to_string()))
+                }
+    }
+
+    pub(in crate::app) fn read_system_clipboard_for_paste(&self) -> Task<Message> {
+        #[cfg(target_arch = "wasm32")]
+        {
+            Task::perform(crate::sys::read_clipboard_text(), |text| {
+                Message::SystemClipboardPaste(match text {
+                    Some(text) if !text.is_empty() => {
+                        crate::app::SystemClipboardText::Text(text)
+                    }
+                    _ => crate::app::SystemClipboardText::EmptyOrUnsupported,
+                })
+            })
+        }
+
+        #[cfg(not(target_arch = "wasm32"))]
+        {
+            iced::clipboard::read_text().map(|result| {
+                use crate::app::SystemClipboardText as Text;
+                use iced::clipboard::Error;
+
+                let result = match result {
+                    Ok(text) if !text.is_empty() => Text::Text((*text).clone()),
+                    Ok(_) | Err(Error::ContentNotAvailable) => Text::EmptyOrUnsupported,
+                    Err(Error::ClipboardUnavailable) | Err(Error::Unknown { .. }) => {
+                        Text::Unavailable
+                    }
+                    Err(Error::ClipboardOccupied) => Text::Occupied,
+                    Err(Error::ConversionFailure) => Text::ConversionFailed,
+                };
+                Message::SystemClipboardPaste(result)
+            })
+        }
     }
 
     pub(super) fn on_qselect_open(&mut self) -> Task<Message> {

src/app/update/mod.rs

@@ -3585,10 +3585,44 @@ impl OpenCADStudio {
             // Ctrl+V. The MText editor and (on the web) the TEXT editor read the
             // system clipboard asynchronously — the only paste path that works
             // in the browser, where the synchronous clipboard the iced
-            // text_input expects is empty. With no editor open it falls through
-            // to the entity paste command.
+            // text_input expects is empty. With no editor open, drawing objects
+            // take priority and system text is used when that clipboard is empty.
             Message::PasteShortcut => self.on_paste_shortcut(),
 
+            Message::SystemClipboardPaste(result) => {
+                use super::SystemClipboardText as Text;
+
+                match result {
+                    Text::Text(text) => {
+                        let flat = text.replace(['\r', '\n'], " ").to_uppercase();
+                        self.command_line.input.push_str(&flat);
+                        self.command_line.autocomplete_cursor = None;
+                        self.focus_cmd_input()
+                    }
+                    Text::EmptyOrUnsupported => {
+                        self.command_line.push_error(
+                            crate::tr!("clipboard-no-supported-content").as_ref(),
+                        );
+                        Task::none()
+                    }
+                    Text::Unavailable => {
+                        self.command_line
+                            .push_error(crate::tr!("clipboard-unavailable").as_ref());
+                        Task::none()
+                    }
+                    Text::Occupied => {
+                        self.command_line
+                            .push_error(crate::tr!("clipboard-occupied").as_ref());
+                        Task::none()
+                    }
+                    Text::ConversionFailed => {
+                        self.command_line
+                            .push_error(crate::tr!("clipboard-conversion-failed").as_ref());
+                        Task::none()
+                    }
+                }
+            }
+
             Message::SelectAllShortcut => {
                 let i = self.active_tab;
                 if self.mtext_editor.as_ref().is_some_and(|e| e.show_preview) {

src/app/view/modal.rs

@@ -1475,14 +1475,13 @@ fn unsaved_changes_dialog_window(
     name: &str,
     sizing: crate::ui::modal::ModalSizing,
 ) -> Element<'static, Message> {
-    let body_text = t!(
-        "Do you want to save changes to \"%{name}\"?",
-        name = name
-    );
-
     container(
         column![
-            text(body_text).size(13),
+            text(name.to_owned()).size(14),
+            iced::widget::Space::new().height(4),
+            text(crate::tr!("modal-unsaved-save-prompt"))
+                .size(12)
+                .style(dialog_muted_text_style),
             iced::widget::Space::new().height(20),
             row![
                 dialog_button(t!("Save"), Message::UnsavedDialogSave, button::primary),

src/ui/command_line.rs

@@ -10,6 +10,7 @@ use iced::widget::{
     text_input, tooltip, Space,
 };
 use iced::{Background, Border, Color, Element, Length, Padding, Theme};
+use std::ops::Range;
 
 pub const CMD_INPUT_ID: &str = "cmd_input";
 pub const HISTORY_SCROLL_ID: &str = "command_history_scroll";
@@ -127,6 +128,58 @@ pub enum EntryKind {
     Info,
 }
 
+/// Per-logical-line entry kinds for the selectable full-history editor.
+/// Keeping this metadata beside the editor's plain text preserves drag
+/// selection and copy while allowing the renderer to restore each entry's
+/// original color.
+#[derive(Clone, Debug, PartialEq, Eq)]
+struct HistoryHighlightSettings {
+    line_kinds: Vec<EntryKind>,
+}
+
+#[derive(Debug)]
+struct HistoryHighlighter {
+    settings: HistoryHighlightSettings,
+    current_line: usize,
+}
+
+impl iced::advanced::text::Highlighter for HistoryHighlighter {
+    type Settings = HistoryHighlightSettings;
+    type Highlight = EntryKind;
+    type Iterator<'a> = std::option::IntoIter<(Range<usize>, EntryKind)>;
+
+    fn new(settings: &Self::Settings) -> Self {
+        Self {
+            settings: settings.clone(),
+            current_line: 0,
+        }
+    }
+
+    fn update(&mut self, settings: &Self::Settings) {
+        self.settings = settings.clone();
+        self.current_line = 0;
+    }
+
+    fn change_line(&mut self, line: usize) {
+        self.current_line = line;
+    }
+
+    fn highlight_line(&mut self, line: &str) -> Self::Iterator<'_> {
+        let kind = self
+            .settings
+            .line_kinds
+            .get(self.current_line)
+            .cloned()
+            .unwrap_or(EntryKind::Output);
+        self.current_line += 1;
+        Some((0..line.len(), kind)).into_iter()
+    }
+
+    fn current_line(&self) -> usize {
+        self.current_line
+    }
+}
+
 impl CommandLine {
     pub fn new() -> Self {
         let mut cl = Self::default();
@@ -317,6 +370,17 @@ impl CommandLine {
             .join("\n")
     }
 
+    fn history_highlight_settings(&self) -> HistoryHighlightSettings {
+        let line_kinds = self
+            .history
+            .iter()
+            .flat_map(|entry| {
+                std::iter::repeat(entry.kind.clone()).take(entry.text.split('\n').count())
+            })
+            .collect();
+        HistoryHighlightSettings { line_kinds }
+    }
+
     /// Drop every history line. The step-prompt mirror is reset too so a
     /// later step still repins correctly.
     pub fn clear_history(&mut self) {
@@ -395,6 +459,7 @@ impl CommandLine {
             visible.push(pinned);
         }
         let start = visible.len().saturating_sub(4);
+        let has_recent_history = start < visible.len();
         let history_rows = visible[start..]
             .iter()
             .fold(column![].spacing(0), |col, entry| {
@@ -600,6 +665,10 @@ impl CommandLine {
                 .size(11)
                 .padding([2, 8])
                 .height(Length::Shrink)
+                .highlight_with::<HistoryHighlighter>(
+                    self.history_highlight_settings(),
+                    history_highlight_format,
+                )
                 .style(|theme: &Theme, _status| {
                     let palette = theme.palette();
                     text_editor::Style {
@@ -678,7 +747,7 @@ impl CommandLine {
         // The transient recent lines and the full archive are two views of the
         // same history. Showing both while the archive is open creates a fake
         // second history region and visually disconnects the input row (#555).
-        let recent_history: Element<'a, Message> = if self.history_open {
+        let recent_history: Element<'a, Message> = if self.history_open || !has_recent_history {
             container(column![]).height(0).into()
         } else {
             container(history_rows)
@@ -698,34 +767,40 @@ impl CommandLine {
             container(column![]).height(0).into()
         };
 
-        container(column![
-            autocomplete,
-            dropdown,
-            recent_history,
-            history_divider,
-            container(input_row)
-                .style(|theme: &Theme| {
-                    let palette = theme.palette();
-                    container::Style {
-                    background: Some(Background::Color(palette.background.weakest.color)),
-                    ..Default::default()
-                    }
-                })
-                .width(Length::Fill)
-                // Match the drawing tab bar / status bar height, and vertically
-                // centre the prompt/input/dropdown within it (issue #216).
-                .center_y(Length::Fixed(30.0)),
-        ])
-        .style(|theme: &Theme| {
+        let history_open = self.history_open;
+        container(
+            column![
+                autocomplete,
+                dropdown,
+                recent_history,
+                history_divider,
+                container(input_row)
+                    .style(|theme: &Theme| {
+                        let palette = theme.palette();
+                        container::Style {
+                            background: Some(Background::Color(
+                                palette.background.weakest.color,
+                            )),
+                            ..Default::default()
+                        }
+                    })
+                    .width(Length::Fill)
+                    // Match the drawing tab bar / status bar height, and vertically
+                    // centre the prompt/input/dropdown within it (issue #216).
+                    .center_y(Length::Fixed(30.0)),
+            ]
+            .width(Length::Fill),
+        )
+        .style(move |theme: &Theme| {
             let palette = theme.palette();
             container::Style {
-            background: Some(Background::Color(palette.background.base.color)),
-            border: Border {
-                color: palette.background.neutral.color,
-                width: 1.0,
-                radius: 4.0.into(),
-            },
-            ..Default::default()
+                background: Some(Background::Color(palette.background.base.color)),
+                border: Border {
+                    color: palette.background.neutral.color,
+                    width: if history_open { 1.0 } else { 0.0 },
+                    radius: 4.0.into(),
+                },
+                ..Default::default()
             }
         })
         .width(Length::Fill.max(720.0))
@@ -819,6 +894,16 @@ fn history_color(theme: &Theme, kind: &EntryKind) -> Color {
     }
 }
 
+fn history_highlight_format(
+    kind: &EntryKind,
+    theme: &Theme,
+) -> iced::advanced::text::highlighter::Format<iced::Font> {
+    iced::advanced::text::highlighter::Format {
+        color: Some(history_color(theme, kind)),
+        font: None,
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use super::{ranked_matches, CommandLine};