fix(xref): carry stable row identity in row messages

XrefManagerSelect/RightClick/RowOp/PathPick/FindReplace carried positional display indices that rescans could retarget. New XrefRowId{key,saved_path} (the identity refresh uses) in all 5 variants, resolved via row_index at dispatch with graceful no-op; panel selection stays index-based. display.index remains for view-time styling/lookup only. Tests: xref_rowop_unknown_id_is_noop (RED first); existing dialog/simulator/click tests migrated to ids. Full suite: 2044 passed / 0 failed / 25 ignored.

src/app/mod.rs

@@ -2671,11 +2671,11 @@ pub enum Message {
     ToggleXrefManager,
     /// Rescan the active drawing's references into the palette.
     XrefManagerRefresh,
-    /// Toggle one palette row (entry index) in the multi-selection set.
-    XrefManagerSelect(usize),
+    /// Toggle one palette row (stable row id) in the multi-selection set.
+    XrefManagerSelect(crate::ui::window::xref_manager::XrefRowId),
     /// Right-click on a palette row: single-select it when outside the
     /// selection (the context menu then acts on the selection).
-    XrefRowRightClick(usize),
+    XrefRowRightClick(crate::ui::window::xref_manager::XrefRowId),
     /// Flip the palette's list/tree presentation.
     XrefManagerToggleTree,
     /// Start a reference-table column divider drag (column index).
@@ -2712,16 +2712,19 @@ pub enum Message {
     XrefManagerToggleExpand(u64),
     /// Selection-scoped palette operation (detach/unload/reload/overlay/pathtype).
     XrefManagerOp(crate::ui::window::xref_manager::XrefPaletteOp),
-    /// Row-scoped palette operation: selects row `index`, then applies the
-    /// operation to it.
-    XrefRowOp(usize, crate::ui::window::xref_manager::XrefPaletteOp),
+    /// Row-scoped palette operation: selects the row by stable id, then
+    /// applies the operation to it.
+    XrefRowOp(
+        crate::ui::window::xref_manager::XrefRowId,
+        crate::ui::window::xref_manager::XrefPaletteOp,
+    ),
     /// Prefill the command line for Find & Replace across references
     /// (`XREF Path Find <old> <new>`); the CLI parses and runs it.
     XrefFindReplacePrompt,
-    /// Pick a new path for a specific row index.
-    XrefRowPathPick(usize),
-    /// Prefill the command line for Find & Replace for a specific row index.
-    XrefRowFindReplacePrompt(usize),
+    /// Pick a new path for a specific row (stable id).
+    XrefRowPathPick(crate::ui::window::xref_manager::XrefRowId),
+    /// Prefill the command line for Find & Replace for a specific row id.
+    XrefRowFindReplacePrompt(crate::ui::window::xref_manager::XrefRowId),
     XrefRowChangePathEnter,
     XrefRowChangePathLeave,
     LayerToggleVisible(String),