Add radar scope, splash screen, Star Wars easter egg, and harden TUI

New features:
- P1 green phosphor radar scope widget on Track screen with LUT-optimized rendering
- Splash screen with pre-baked ANSI half-block art from 16colo.rs/Mistigris
- Star Wars ASCII animation via telnet (ctrl+w) with IPv6 happy eyeballs and offline fallback
- Dark Side / New Hope toast notifications on theme toggle
- Kitty terminal detection with cat emoji on splash

Robustness (from Apollo code review):
- Circuit breaker in track loop after 10 consecutive errors
- Input validation for frequency, symbol rate, step size across scan/spectrum/track
- Consolidated sys.path manipulation into __init__.py
- Radar scope pre-computes dist/angle LUT per pixel on resize

Cleanup:
- Removed unused imports across lband, monitor, scan, signal_gauge
- Moved Pillow/textual-image to optional dev deps (splash uses pre-baked ANSI)
- Added 41-test pytest suite covering telnet IAC parsing, radar geometry, splash assets

tui/pyproject.toml

@@ -18,6 +18,20 @@ skywalker-tui = "skywalker_tui.app:main"
 
 [tool.hatch.build.targets.wheel]
 packages = ["src/skywalker_tui"]
+artifacts = ["src/skywalker_tui/assets/**"]
+
+[project.optional-dependencies]
+dev = [
+    "Pillow>=10.0",
+]
+test = [
+    "pytest>=8.0",
+    "pytest-asyncio>=0.24",
+]
+
+[tool.pytest.ini_options]
+testpaths = ["tests"]
+asyncio_mode = "auto"
 
 [tool.ruff]
 target-version = "py311"