readOpen() (reviewer f9027f5 non-blocking note):
- Previously returned v === '1' which collapsed '0' AND any garbage
value (legacy markers, manual edits) into the same false branch,
contradicting the 'fallback to default' comment. Split into three
explicit cases: '1' → true, '0' → false, anything else →
defaultOpen. Behavior unchanged for the writeOpen-only path; only
garbage input is corrected.
RelatedStocks defaultOpen=false:
- Of the three collapsible sidebar panels (AlertsPanel,
InvestmentNote, RelatedStocks), RelatedStocks has the lowest
information density per row and the weakest direct tie to 'this
symbol' (it's other symbols in the same market). Starting collapsed
cuts initial mobile scroll height for first-time visitors; once the
user toggles, localStorage pins their preference.
d53ff7a745