feat(todo): refactor inline title editing + kanban subtask DnD

- TaskItem: switch title editing to <input>-based pattern (isEditingTitle
  state, single-click to start, blur/Enter saves, Escape cancels)
- KanbanTaskCard: contenteditable span for title editing (blur-to-save),
  add ArrowsOutSimple detail button (hover-only), inline subtask DnD
  with shadow placeholder handling and dropInProgress guard
- SubtaskList: fix DnD reactivity loop — use $state instead of $derived
  for items, add SHADOW_PLACEHOLDER_ITEM_ID filter, dropInProgress flag

fix(guides): remove non-existent allAppsHref prop from PillNavigation
fix(memoro): extend Memory interface with memo_id, timestamps, nullable types

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/guides/apps/web/src/routes/(app)/+layout.svelte

@@ -158,7 +158,6 @@
 			showAppSwitcher={true}
 			{appItems}
 			{userEmail}
-			allAppsHref="/apps"
 		/>
 
 		<main class="relative z-0 pb-24" style="padding-top: 0">