Merge branch 'main' into feature/parametric-constraint-system

Brings in 54 commits from origin/main: a selection-performance overhaul,
surface thickening, GPU-native wide/tapered stroke rendering, continued
ocs_doc_api evolution, and assorted fixes/polish (block double-click
editing, DWG hatch/database repair, clipboard, collapsible Properties
sections).

Six real conflicts, all where this branch had independently re-applied
a fix upstream later revised or already carried natively:

- src/app/automation.rs, src/app/command_driver.rs: combined both
  sides — kept this branch's sketch-constraint/named-parameter loading
  on "new"/"open", adopted main's Scene::clear()/material_base_dir and
  its newer rebuild_derived_caches() over the older bump_geometry().
  Scene::clear() (src/scene/entity.rs) now also resets
  sketch_constraints/named_parameters, so every caller gets this for
  free instead of each call site repeating it.
- src/io/mod.rs, src/scene/render_graph.rs: adopted main's design
  outright (commit 973af87d, authored by Hakan directly) — a large
  MINSERT is no longer purged as "corrupt" at load, only its rendering
  is bounded, preserving the source data. This branch's own earlier
  design (reject at load) predates that revision.
- src/scene/pipeline/mesh_gpu.rs: adopted main's valid_rgba_size()
  guard (a real robustness improvement over this branch's version).
- src/snap.rs: replaced wholesale with main's version — this branch's
  copy was an explicit verbatim snapshot from an earlier upstream PR
  (commit 4c264b8c) with zero constraint-system-specific content, and
  main has since evolved it considerably further.

Also removed two now-dead duplicates the merge surfaced without a
conflict marker (both branches had independently fixed the same
things): the OPTIONS/OP command dispatch/autocomplete entries, and
automation.rs's open_finalizes_and_purges_like_the_ui_open_path test
(kept main's version, which covers strictly more: solid_models/
material_base_dir reset on "new").

Full workspace suite passes (812 lib tests + this branch's own 24
constraint/persistence integration tests) except the one pre-existing,
unrelated font-test failure already present on main. Zero clippy
findings in the hand-written merge resolution itself; the ~1,171
warnings clippy reports are pre-existing in the 54 absorbed commits,
not introduced here.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

src/app/mod.rs

@@ -387,6 +387,10 @@ pub(super) struct OpenCADStudio {
     /// though the three factors are currently equal — the user unchecked the
     /// "Uniform scale" box for them (#427). Keyed by entity handle.
     props_asym_scale: std::collections::HashSet<u64>,
+    /// Collapsed Properties-panel section titles. This belongs to the app,
+    /// rather than an individual document tab, so the same view preference is
+    /// used by every currently open drawing/project.
+    collapsed_property_sections: rustc_hash::FxHashSet<String>,
     /// Which Start-page section is shown when the page is too narrow for all
     /// three side by side and falls back to a tab bar.
     start_section: StartSection,
@@ -496,6 +500,13 @@ pub(super) struct OpenCADStudio {
     cursor_size: i32,
     /// Selection-box size setting (PICKBOX, 0..=50).
     pick_box: i32,
+    /// Use REFEDIT rather than BEDIT when double-clicking an attribute-free block.
+    double_click_block_refedit: bool,
+    /// Open ATTEDIT when double-clicking a block with attributes.
+    double_click_block_attedit: bool,
+    /// Selected-object count past which grips stop being generated
+    /// (GRIPOBJLIMIT, 0..=32767; 0 = no limit).
+    grip_object_limit: i32,
     /// Drawing viewport cursor style (CURSORTYPE).
     cursor_type: settings::CursorType,
     /// Explicit crosshair colour; `None` retains automatic contrast.
@@ -1962,6 +1973,10 @@ pub enum Message {
     CursorSizeChanged(i32),
     /// Set PICKBOX from the Selection-page slider.
     PickBoxChanged(i32),
+    /// Choose whether double-clicking a block starts BEDIT or REFEDIT.
+    DoubleClickBlockRefeditChanged(bool),
+    /// Choose whether double-clicking a block with attributes starts ATTEDIT.
+    DoubleClickBlockAtteditChanged(bool),
     /// Set CURSORTYPE from Options.
     CursorTypeChanged(settings::CursorType),
     /// Set the model-space lineweight preview scale from Options.
@@ -2008,6 +2023,19 @@ pub enum Message {
     GripHotChanged(u8),
     /// Change Hover/Warm Grip color ACI index (0 = Theme Primary Strong, 1..=255 = ACI, GRIPHOVER).
     GripHoverChanged(u8),
+    /// Change the selected-object count past which grips stop being drawn
+    /// (0..=32767, 0 = no limit, GRIPOBJLIMIT).
+    GripObjectLimitChanged(i32),
+    /// Toggle the solid selection highlight (SELECTIONEFFECT).
+    SelectionEffectToggled(bool),
+    /// Toggle rollover preview while no command is running (SELECTIONPREVIEW bit 1).
+    SelectionPreviewIdleToggled(bool),
+    /// Toggle rollover preview during a command (SELECTIONPREVIEW bit 2).
+    SelectionPreviewCommandToggled(bool),
+    /// Toggle "use Shift to add to selection"; this is the inverse of PICKADD.
+    ShiftToAddToggled(bool),
+    /// Toggle press-and-drag drawing a rectangle instead of a lasso (PICKDRAG).
+    PickDragRectToggled(bool),
     /// Restore Model Space display/canvas appearance to defaults.
     RestoreModelSpaceDisplayDefaults,
     /// Restore Selection visual effect settings to defaults.
@@ -2214,6 +2242,8 @@ pub enum Message {
     /// clipboard as plain text — issue #232, so output can be pasted for
     /// debugging instead of screenshotted.
     CommandHistoryCopy,
+    #[cfg(target_arch = "wasm32")]
+    CommandHistoryCopied(bool),
     /// Clear every line from the command-line history.
     CommandHistoryClear,
     /// Copy every line currently retained by the PERF panel.
@@ -2604,6 +2634,8 @@ pub enum Message {
     /// Toggle a collapsed coordinate group ("Position", "Scale", …) open or
     /// closed in the Properties panel, keyed `section:base`.
     PropGroupToggle(String),
+    /// Toggle an entire Properties-panel section, keyed by its title.
+    PropSectionToggle(String),
     /// Toggle the editable-dropdown (block Name) option list open/closed.
     PropEditChoiceToggle,
     /// User is typing in a block-attribute value field (live buffer update),
@@ -3378,6 +3410,7 @@ impl OpenCADStudio {
             discussions: Vec::new(),
             discussions_loading: false,
             props_asym_scale: std::collections::HashSet::new(),
+            collapsed_property_sections: rustc_hash::FxHashSet::default(),
             start_section: StartSection::default(),
             start_action_w: std::sync::Arc::new(std::sync::atomic::AtomicU32::new(0)),
             history_content: iced::widget::text_editor::Content::new(),
@@ -3426,6 +3459,9 @@ impl OpenCADStudio {
             zoom_factor: 60,
             cursor_size: 5,
             pick_box: 3,
+            double_click_block_refedit: false,
+            double_click_block_attedit: true,
+            grip_object_limit: settings::DEFAULT_GRIP_OBJECT_LIMIT,
             cursor_type: settings::CursorType::Crosshair,
             crosshair_color: None,
             crosshair_color_input: String::new(),