Selection: report what each pick found while a command gathers objects

Every pick during object selection prints the reference's count line:
"N found" for the first pick or a pick that adds nothing, "N found,
M total" after it, "N found, N removed, M total" when objects leave the
set. It is printed before a command's own filtering, so "N were filtered
out" follows it. COUNT reports through it and the ad hoc
"object(s) found." / "object(s) added to selection." lines are gone.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/app/mod.rs

@@ -796,6 +796,9 @@ pub(super) struct OpenCADStudio {
     block_freq: std::collections::HashMap<String, u32>,
     /// BLOCKMRULIST: how many recent blocks the palette keeps (0–100).
     pub(crate) block_mru_list: u8,
+    /// The selection the gathering command had after the last pick (keyed by
+    /// the command), for the `N found, M total` line.
+    pub(crate) selection_report: Option<(usize, Vec<codec::Handle>)>,
     /// The Edit Reference dialog's remembered settings.
     pub(crate) refedit_options: crate::app::settings::RefEditOptions,
     /// BLOCKREDEFINEMODE (0–2).
@@ -4682,6 +4685,7 @@ impl OpenCADStudio {
             block_mru: Vec::new(),
             block_freq: std::collections::HashMap::new(),
             block_mru_list: 50,
+            selection_report: None,
             refedit_options: Default::default(),
             block_redefine_mode: 1,
             block_navigate: ".".to_string(),