refactor: split NoteList.tsx god component into focused modules

Extract 7 sub-modules under components/note-list/:
- PinnedCard.tsx, RelationshipGroupSection.tsx, TrashWarningBanner.tsx
- NoteListHeader.tsx, NoteListViews.tsx
- noteListHooks.ts, noteListUtils.ts

NoteList.tsx reduced from 579 → 95 lines. No behavior changes.
All 2152 unit tests pass, 80%+ coverage, lint + typecheck clean.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/components/note-list/NoteListViews.tsx

@@ -0,0 +1,76 @@
+import { Virtuoso, type VirtuosoHandle } from 'react-virtuoso'
+import type { VaultEntry } from '../../types'
+import type { SortOption, SortDirection, SortConfig, RelationshipGroup } from '../../utils/noteListHelpers'
+import { PinnedCard } from './PinnedCard'
+import { RelationshipGroupSection } from './RelationshipGroupSection'
+import { TrashWarningBanner, EmptyMessage } from './TrashWarningBanner'
+
+function ListViewHeader({ isTrashView, expiredTrashCount }: {
+  isTrashView: boolean; expiredTrashCount: number
+}) {
+  return <TrashWarningBanner expiredCount={isTrashView ? expiredTrashCount : 0} />
+}
+
+function resolveEmptyText(isChangesView: boolean, changesError: string | null | undefined, isTrashView: boolean, query: string): string {
+  if (isChangesView && changesError) return `Failed to load changes: ${changesError}`
+  if (isChangesView) return 'No pending changes'
+  if (isTrashView) return 'Trash is empty'
+  return query ? 'No matching notes' : 'No notes found'
+}
+
+export function EntityView({ entity, groups, query, collapsedGroups, sortPrefs, onToggleGroup, onSortChange, renderItem, typeEntryMap, onClickNote }: {
+  entity: VaultEntry; groups: RelationshipGroup[]; query: string
+  collapsedGroups: Set<string>; sortPrefs: Record<string, SortConfig>
+  onToggleGroup: (label: string) => void; onSortChange: (label: string, opt: SortOption, dir: SortDirection) => void
+  renderItem: (entry: VaultEntry) => React.ReactNode
+  typeEntryMap: Record<string, VaultEntry>; onClickNote: (entry: VaultEntry, e: React.MouseEvent) => void
+}) {
+  return (
+    <div className="h-full overflow-y-auto">
+      <PinnedCard entry={entity} typeEntryMap={typeEntryMap} onClickNote={onClickNote} showDate />
+      {groups.length === 0
+        ? <EmptyMessage text={query ? 'No matching items' : 'No related items'} />
+        : groups.map((group) => (
+          <RelationshipGroupSection key={group.label} group={group} isCollapsed={collapsedGroups.has(group.label)} sortPrefs={sortPrefs} onToggle={() => onToggleGroup(group.label)} handleSortChange={onSortChange} renderItem={renderItem} />
+        ))
+      }
+    </div>
+  )
+}
+
+export function ListView({ isTrashView, isChangesView, changesError, expiredTrashCount, deletedCount = 0, searched, query, renderItem, virtuosoRef }: {
+  isTrashView: boolean; isChangesView?: boolean; changesError?: string | null; expiredTrashCount: number
+  deletedCount?: number; searched: VaultEntry[]; query: string
+  renderItem: (entry: VaultEntry) => React.ReactNode
+  virtuosoRef?: React.RefObject<VirtuosoHandle | null>
+}) {
+  const emptyText = resolveEmptyText(!!isChangesView, changesError ?? null, isTrashView, query)
+  const hasHeader = isTrashView && expiredTrashCount > 0
+  const hasDeletedOnly = !!isChangesView && deletedCount > 0 && searched.length === 0
+
+  if (searched.length === 0 && !hasDeletedOnly) {
+    return (
+      <div className="h-full overflow-y-auto">
+        {hasHeader && <ListViewHeader isTrashView={isTrashView} expiredTrashCount={expiredTrashCount} />}
+        <EmptyMessage text={emptyText} />
+      </div>
+    )
+  }
+
+  if (hasDeletedOnly) {
+    return <div className="h-full" />
+  }
+
+  return (
+    <Virtuoso
+      ref={virtuosoRef}
+      style={{ height: '100%' }}
+      data={searched}
+      overscan={200}
+      components={{
+        Header: hasHeader ? () => <ListViewHeader isTrashView={isTrashView} expiredTrashCount={expiredTrashCount} /> : undefined,
+      }}
+      itemContent={(_index, entry) => renderItem(entry)}
+    />
+  )
+}