fix: add visible brief window controls

src/App.tsx

@@ -720,9 +720,10 @@ function ThreadEditor({ connection, sourceName, targetName, isNew, onClose, onSa
 }
 
 function BriefPanel({ brief, parties, recentlyCreatedExhibitId, canEdit, onClose, onEdit, onClassify, onNewParty, onLocate, onEditParty }: { brief: LevelBrief; parties: Evidence[]; recentlyCreatedExhibitId: string | null; canEdit: boolean; onClose: () => void; onEdit: () => void; onClassify: (id: string, kind: PartyKind) => void; onNewParty: () => void; onLocate: (id: string) => void; onEditParty: (id: string) => void }) {
+  const [minimized, setMinimized] = useState(false)
   const partyById = new Map(parties.map(party => [party.id, party]))
   const unresolved = brief.concepts.filter(concept => !concept.resolvedPartyExhibitId).length
-  return <aside className="brief-panel"><header><div><small>LEVEL BRIEF · {unresolved} UNRESOLVED</small><b>CONCEPT CLASSIFICATION</b></div><button aria-label="Close brief" onClick={onClose}><X size={14}/></button></header>
+  return <aside className={`brief-panel ${minimized ? 'minimized' : ''}`}><header onDoubleClick={() => setMinimized(value => !value)}><div><small>LEVEL BRIEF · {unresolved} UNRESOLVED</small><b>CONCEPT CLASSIFICATION</b></div><span/><button type="button" aria-label={minimized ? 'Restore brief' : 'Minimize brief'} title={minimized ? 'Restore' : 'Minimize'} onDoubleClick={event => event.stopPropagation()} onClick={() => setMinimized(value => !value)}>{minimized ? <Plus size={14}/> : <Minus size={14}/>}</button><button type="button" aria-label="Close brief" title="Close" onDoubleClick={event => event.stopPropagation()} onClick={onClose}><X size={14}/></button></header>
     <p>{brief.body || 'No brief has been authored yet.'}</p>
     <div className="brief-concepts">{brief.concepts.map(concept => { const resolved = concept.resolvedPartyExhibitId ? partyById.get(concept.resolvedPartyExhibitId) : undefined; return <section className={`${resolved ? 'resolved' : ''} ${resolved?.id === recentlyCreatedExhibitId ? 'just-resolved' : ''}`} key={concept.id}><div><b>{concept.label}</b><span>{concept.context}</span></div>{resolved ? <div className="resolved-actions"><span>{resolved.partyKind === 'person' ? <UserRound size={14}/> : <Building2 size={14}/>} {resolved.partyKind?.toUpperCase()}</span><button onClick={() => onLocate(resolved.id)}>LOCATE</button><button onClick={() => onEditParty(resolved.id)}>EDIT DOSSIER</button></div> : <div className="classify-actions"><button onClick={() => onClassify(concept.id, 'person')}><UserRound size={14}/> PERSON</button><button onClick={() => onClassify(concept.id, 'organization')}><Building2 size={14}/> ORGANIZATION</button></div>}</section> })}</div>
     <button className="new-party-from-brief" onClick={onNewParty}><Plus size={13}/> CREATE PARTY NOT LISTED ABOVE</button>