M1: Set default properties gives new shapes and text the layer's properties (#2028)

Edit ▸ Set default properties put the selected layer's properties into the Paste properties
clipboard and did nothing else: a rectangle drawn afterwards was still the default grey, and what
Copy properties had copied was replaced.

The defaults are now kept apart (`Session::default_props`: one set for shapes, set from any layer
but text, and one for text). Rectangles, ellipses, polygons and stars drawn or clicked with their
tools take the shape defaults: fills, strokes and their settings, effects, opacity, blend and
corners (only where the shape has corners), through `apply_copied_props`, the rules Paste
properties already used (now shared). New text from the Text tool takes a text layer's fills and
font and is laid out at that size. Frames, sections, slices, lines, arrows, vectors and layers made
by commands keep their own look; the help center is silent on those. `edit.setDefaultProperties`
answers `{for: shapes|text, properties}`.

Tests: `default_props_tests::new_shapes_drawn_with_the_tools_take_the_default_properties`,
`setting_defaults_leaves_the_copied_properties_alone`,
`new_text_takes_a_text_layers_defaults_and_shapes_keep_theirs`. Docs: ui-parity.md, ROADMAP.md.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LvG6E2LxvJ6MuFmiLA6Zqm

crates/engine/src/cmd/edit.rs

@@ -17,6 +17,7 @@ mod clipboard;
 mod props;
 mod select;
 
+pub(crate) use clipboard::apply_copied_props;
 pub use clipboard::{CLIP_CLOSE, CLIP_OPEN, copy_to_clipboard, design_clipboard_buffer, paste_into};
 use clipboard::{copy, copy_props, copy_props_of, cut, paste, paste_design_layers, paste_over, paste_props, paste_replace};
 use props::{
@@ -142,12 +143,26 @@ pub fn specs() -> Vec<CommandSpec> {
             true,
             find_replace
         ),
-        spec!("edit.setDefaultProperties", "Set default properties", "{id?}", false, |s, p| {
-            let id = targets(s, p).first().copied().ok_or_else(|| bad("edit.setDefaultProperties", "select a layer"))?;
-            let v = copy_props_of(s.doc()?, id);
-            s.clipboard.props = Some(v);
-            ok()
-        }),
+        spec!(
+            "edit.setDefaultProperties",
+            "Set default properties",
+            "{id?}  the layer's fills, strokes, effects, opacity and corners (a text layer's: also its font) become what new rectangles, ellipses, polygons and stars (or, from a text layer, new text) drawn with the tools take → {for: shapes|text, properties}",
+            false,
+            |s, p| {
+                let id = targets(s, p).first().copied().ok_or_else(|| bad("edit.setDefaultProperties", "select a layer"))?;
+                let doc = s.doc()?;
+                let text = matches!(doc.get(id)?.kind, NodeKind::Text(_));
+                let v = copy_props_of(doc, id);
+                let kind = if text {
+                    s.default_props.text = Some(v.clone());
+                    "text"
+                } else {
+                    s.default_props.shape = Some(v.clone());
+                    "shapes"
+                };
+                Ok(json!({"for": kind, "properties": v}))
+            }
+        ),
         spec!("select.set", "Select", "{ids: [..]}  (replace the selection)", false, |s, p| {
             let ids = match get(p, "ids") {
                 Some(Value::Array(a)) => a.iter().filter_map(id_of).collect(),

crates/engine/src/cmd/edit/clipboard.rs

@@ -357,21 +357,27 @@ pub(super) fn copy_props(s: &mut Session, p: &Value) -> Result<Value> {
     Ok(v)
 }
 
+/// Give layer `id` the properties [`copy_props_of`] copied (`props`), those it can take: the text
+/// properties only to text, the corners only to a layer with corners.
+pub(crate) fn apply_copied_props(cmd: &str, doc: &mut Document, id: NodeId, props: &Value) -> Result<()> {
+    let mut m = props.as_object().cloned().unwrap_or_default();
+    let is_text = matches!(doc.get(id)?.kind, NodeKind::Text(_));
+    if !is_text {
+        m.retain(|k, _| !k.starts_with("font") && k != "lineHeight" && k != "letterSpacing");
+    }
+    if !doc.get(id)?.kind.has_corner_radius() {
+        m.remove("cornerRadius");
+        m.remove("cornerSmoothing");
+    }
+    crate::cmd::props::apply(cmd, doc, id, &m)
+}
+
 pub(super) fn paste_props(s: &mut Session, p: &Value) -> Result<Value> {
     let props = s.clipboard.props.clone().ok_or_else(|| EngineError::Disabled("edit.pasteProperties".into(), "no copied properties".into()))?;
     let ids = req_targets("edit.pasteProperties", s, p)?;
     let doc = s.doc_mut()?;
     for i in ids {
-        let mut m = props.as_object().cloned().unwrap_or_default();
-        let is_text = matches!(doc.get(i)?.kind, NodeKind::Text(_));
-        if !is_text {
-            m.retain(|k, _| !k.starts_with("font") && k != "lineHeight" && k != "letterSpacing");
-        }
-        if !doc.get(i)?.kind.has_corner_radius() {
-            m.remove("cornerRadius");
-            m.remove("cornerSmoothing");
-        }
-        crate::cmd::props::apply("edit.pasteProperties", doc, i, &m)?;
+        apply_copied_props("edit.pasteProperties", doc, i, &props)?;
     }
     ok()
 }