feat(web): collapsible hideable left+right debug panes
Each debug pane (#rail-left, #affect-console) gains an independent collapse control: a chevron button in the pane header folds it to a 22px re-open strip, and #center (flex:1) reflows to fill. State persists per-pane in localStorage (ratatoskr-left-collapsed / -right-collapsed), matching the theme/cot-toggle idiom; the right-side drag-resizer hides with its pane. Collapsing both yields a clean chat-only surface. Playwright-verified end-to-end (default-open, collapse-to-strip, center reflow, independent left/right, reload persistence, re-open).
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