fix: fillet fit review follow-ups (#404)

* fix: fillet fit review follow-ups

From the review of #388 (merged before these landed):
- The Fillet dialog's Applied Radius showed nothing when editing a fillet
  that was already reduced: the preview found the radius by diffing the
  states before and after. The engine's preview now keeps the command
  replies, and the dialog reads the radius of the feature they name.
- Pattern copies of a reduced fillet try the radius the original was
  reduced to first, instead of each searching again (up to 16 fillets).
- fit: reduce with a chord or variable radius is refused instead of being
  silently ignored.
- One helper appends a note to a feature's warning; too_large is imported
  like unsupported in the loop and curve blends.

Refs #293

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TWc1smHYwTSVrVc8SNvS44

* Use the solidcraft_doc crate name after the rename

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HWLPLy7ug7URSK5WybjRNa

---------

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: bherbruck <brennen.herbruck@gmail.com>

crates/kernel/src/loopblend.rs

@@ -10,6 +10,7 @@ use std::collections::HashMap;
 use solidcraft_geom::Vec3;
 use truck_modeling::{self as mt, builder};
 
+use crate::blend::too_large;
 use crate::body::{Solid, from_p3, p3, v3};
 use crate::record::Rebuild;
 use crate::{KernelError, Result};
@@ -356,7 +357,7 @@ fn build(
         }
         let p = joint_point(i).ok_or_else(|| unsupported("degenerate loop joint"))?;
         if !crate::blend::extension_fits(f, p, *q, size * 1e-7) {
-            return Err(crate::blend::too_large("the blend is larger than the neighbouring faces"));
+            return Err(too_large("the blend is larger than the neighbouring faces"));
         }
     }
     // The offset arcs must not turn inside out; an arc of exactly the blend's radius shrinks
@@ -371,12 +372,12 @@ fn build(
                     *x = true;
                 }
             } else if toward && a.dist(c) <= r + tol {
-                return Err(crate::blend::too_large("the blend is larger than a corner radius"));
+                return Err(too_large("the blend is larger than a corner radius"));
             }
         }
     }
     if collapsed.iter().all(|x| *x) {
-        return Err(crate::blend::too_large("the blend is larger than a corner radius"));
+        return Err(too_large("the blend is larger than a corner radius"));
     }
     let mut va: Vec<mt::Vertex> = pa.iter().map(|p| builder::vertex(p3(*p))).collect();
     // A collapsed piece starts and ends at one vertex.
@@ -546,11 +547,7 @@ fn build(
                 let along = (from_p3(other.point()) - from_p3(v.point())).dot(target - from_p3(v.point()));
                 let reach = (target - from_p3(v.point())).len2();
                 if along <= reach + tol {
-                    return Err(crate::blend::too_large(if face_side {
-                        "the blend is longer than the next edge"
-                    } else {
-                        "the blend is taller than the walls"
-                    }));
+                    return Err(too_large(if face_side { "the blend is longer than the next edge" } else { "the blend is taller than the walls" }));
                 }
                 let nb = if face_side { va.get(i) } else { vb.get(i) }.ok_or_else(|| KernelError::Failed("joint".into()))?;
                 let slot = seam_ends.entry(e.id()).or_insert_with(|| (e.absolute_clone(), None, None));
@@ -566,7 +563,7 @@ fn build(
         let a = a.unwrap_or_else(|| e.absolute_front().clone());
         let b = b.unwrap_or_else(|| e.absolute_back().clone());
         if from_p3(a.point()).dist(from_p3(b.point())) < tol * 10.0 {
-            return Err(crate::blend::too_large("the blend is longer than the next edge"));
+            return Err(too_large("the blend is longer than the next edge"));
         }
         seam_subst.insert(id, builder::line(&a, &b));
     }