fix: use PlotSettings paper dimensions for correct paper-space rendering

paper_limits() now reads paper_width/paper_height/plot_rotation from the
Layout object (populated by a patched acadrust from the embedded DWG
PlotSettings). This fixes layouts where min/max_limits do not match the
physical paper size (e.g. A4 portrait content inside A3 landscape limits).

DXF files use codes 44/45/73 from raw_plot_settings_codes; DWG files use
the PlotSettings block embedded in the LAYOUT object. Both fall back to
min/max_limits when paper_width is zero.

Depends on HakanSeven12/acadrust feat/layout-paper-dimensions (PR #21 on
hakanaktt/acadrust); using that fork until the PR is merged.

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

Cargo.toml

@@ -21,3 +21,6 @@ rayon = "1"
 
 [target.'cfg(target_os = "windows")'.dependencies]
 windows-sys = { version = "0.59", features = ["Win32_UI_Shell", "Win32_UI_WindowsAndMessaging"] }
+
+[patch.crates-io]
+acadrust = { git = "https://github.com/HakanSeven12/acadrust.git", branch = "feat/layout-paper-dimensions" }