Release v0.3

Features

• UI: Background-threaded mesh processing for snappier load (ccfbf99)
• UI: Pan with middle mouse button (5bf5bfb)
• UI: Zoom to cursor instead of screen midpoint (0b901c6)
• UI: Editable numeric color range inputs (bca1ab3)
• UI: Message box showing warnings produced during solve (f07342a)
• Solver: Compute and return residual norm and ground node current as diagnostics (2ffea33)
• Mesh: De-sparsified *Form classes and embedded indices into mesh components for performance (3004ee2, 2a486be)
• Problem: Project name is now stored inside the Problem dataclass (e8d0f40)

Fixes

• KiCad 10 compatibility (ed2f877), with CI matrix over KiCad 9 and 10 (8d42640)
• Gerber plotting no longer applies the Aux origin (0a0bd98)
• Added a geometry cleanup step for malformed KiCad layers (1054da7)
• CGAL: properly construct Polygon_2 and enable assertions to surface errors cleanly (e0f4ca7, fe7877c)
• Cache layer.shape.geoms to avoid repeated Shapely accessor cost (66e26ce)
• Improved warnings for floating copper and non-zero ground potential (67d72c8, 8a1404d)
• Stop stripping debug info from .so files (c7c3e32)

Refactoring

• Swapped pybind11 for nanobind in the CGAL extension (c41fe06)
• Solver factored into smaller functions for benchmarking (4a8b1c9)
• handle_errors converted from context manager to decorator (b485c6f)

Docs

• Sphinx documentation setup, including sphinx-polyversion for multi-version docs and AutoAPI (54b1ff5, 29dd0ee, e37759b)
• make -C docs devserver for live autobuild (25df8d5)

Testing & Benchmarks

• New test_set_1 KiCad test board (4010eed, 142da3c, 339ed33, cd5ff0a)
• CI now executes the asv benchmark suite (33de2eb)
• Many new benchmarks: spatial indices, prepare_X_form, connectivity, mesh generation, many_meshes/many_meshes_many_vias stress projects (bca56ab, 0d3730a, 6f6edf6, 4f184cc, 9efa2b2, d77a266, 8ed1554)
• New tests for CLI warning collection, UI spatial indices, and Solution pickling (84b8b7e, 7186b00, 64f6afc)

Full Changelog: v0.2...v0.3