fix(scene): rescale dash pattern when projecting wires to paper space

`viewport_content_wires` cloned model-space tessellations and overwrote
`points` with paper-space projections (× scale) but left `pattern_length`
and `pattern` at their model-coord values (pre-multiplied by PSLTSCALE's
1/vp_scale). The GPU then compared a paper-coord distance against a
model-coord pattern, so dashed linetypes in viewport content collapsed to
solid (a typical 9 mm paper line fell inside the first 180 mm dash).

Multiply the projected wire's pattern by the same vp scale used for the
points. Works for both PSLTSCALE on (paper-uniform dashes) and off
(dashes shrink with viewport scale).

Adds two diagnostic examples used to track this down:
  - inspect_lt: which layers/entities carry dashed linetypes
  - inspect_block: enumerate entities + linetypes inside a named block

src/scene/mod.rs

@@ -1987,6 +1987,12 @@ impl Scene {
                 out.points = clipped;
                 out.color = [r * 0.80, g * 0.80, b * 0.80, a * 0.85];
                 out.line_weight_px = wire.line_weight_px;
+                // Wire's pattern was sized for model-space coords during
+                // tessellation; we just projected points into paper coords
+                // (× scale), so rescale the dash pattern by the same factor
+                // to keep dimensional consistency in the GPU shader.
+                out.pattern_length = wire.pattern_length * scale;
+                out.pattern = wire.pattern.map(|v| v * scale);
                 out.vp_scissor = Some([vp_x0, vp_y0, vp_x1, vp_y1]);
                 projected.push(out);
             }