fix(hatch): render weighted pattern strokes

Show styled boundaries only while selected.\n\nRefs #821

src/scene/pipeline/hatch_gpu/storage.rs

@@ -295,9 +295,7 @@ impl StorageHatchBatch {
                         // along-line phase.
                         let perp_step = fam.dy;
                         let along_step = fam.dx;
-                        // Screen-space derivative drives 1-px line width
-                        // in the shader; this stored field is unused.
-                        let line_width = 0.0_f32;
+                        let line_width = h.line_weight_px.max(1.0);
                         let period: f32 = fam.dashes.iter().map(|d| d.abs()).sum();
                         families.push(LineFamilyGpu {
                             cos_a: fam.angle_deg.to_radians().cos(),

src/scene/pipeline/hatch_gpu/texture.rs

@@ -286,7 +286,12 @@ impl TextureHatch {
                 texels.push([angle_r.cos(), angle_r.sin(), fam.x0, fam.y0]);
                 texels.push([fam.dx, fam.dy, fam.dy, fam.dx]);
                 // Counts as exact f32 (small integers → no denormal/bitcast risk).
-                texels.push([0.0, period, n_dashes as f32, dash_rel as f32]);
+                texels.push([
+                    model.line_weight_px.max(1.0),
+                    period,
+                    n_dashes as f32,
+                    dash_rel as f32,
+                ]);
                 n_families += 1;
             }
         }