Rail gets a drag handle on its edge (240-640px, width persisted like
the rest of the panel state). Escape now closes the panel as the last
step of its chain (dialog > inline > selection > panel). The dev panel
remembers its tab across reloads. Panel toggle button title notes the
Esc shortcut. Harness covers resize/persist, Esc-close and dev tab.
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Co-Authored-By: Codebuff <noreply@codebuff.com>
Rail sections (Outline/Blocks/Nodes) collapse via their headers like
Experiments already did, so long pages stay navigable. Rail open state
and section toggles persist in localStorage across reloads (the QA
preview flow reloads constantly). The assistant panel shifts left while
the dev panel is open instead of stacking exactly underneath it, and
the rail/dev/assistant widths cap at the viewport on small screens.
Tests: rail-sections harness (collapse, reload persistence, shifted
assistant); harness boots with a fresh profile unless keepStorage is
passed; in-memory localStorage shim for the origin-less jsdom.
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Co-Authored-By: Codebuff <noreply@codebuff.com>
mats