tgu-editor.css: add .map-pass-selector styles — floating panel with
semi-transparent background, range slider track, fill, tick marks, draggable
thumbs, and per-handle labels showing orbit number + UTC time.
docs: update PCP_ARCHITECTURE.md to reflect pcp-tgu-ops-ui is now a real SPA
(not a placeholder); add PCP_TGU_OPS_UI_CAPABILITY_MAP.md describing feature
areas and data sources for the TGU ops frontend.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>