docs: record list folders in the Data and Ui CLAUDE.md

src/ClaudeDo.Ui/CLAUDE.md

@@ -41,6 +41,7 @@ Design/         — Tokens.axaml (design tokens; merged before styles)
 
 - **IslandsShellViewModel** — root coordinator. Owns the three island VMs and the `WorkerClient`, wires cross-island events (selection, notes/prep mode, conflict resolution), connection state, the update banner, the inline worker-log strip (clickable → Log Visualizer overlay; `FlashFooterError` surfaces UI-action failures + the worker's Warn/Error there), responsive-layout flags (`ShowLists`/`ShowDetails` by window width), `PrimeStatus` flash, the modal openers, and `RestartWorkerAsync`/`CheckForUpdatesAsync`. Hosts `UpdateCheckService`.
 - **ListsIslandViewModel** — smart lists (My Day, Important, Planned, virtual queued/running/review), user lists, selection, list CRUD, drag-reorder, badge counts, opens list settings / repo import / worktrees overview, `OpenInExplorer`/`OpenInTerminal`.
+  - **Folders:** `Folders` (`ListFolderNavItemViewModel`, each with its own `Lists`) + `RootLists` are what the sidebar binds to; `UserLists` stays the **flat superset** every count refresh, row refresh and the no-repo banner work over — a row lives in both. `ContainerOf(row)` resolves which collection renders it. A folder is never selectable: tapping the header runs `ToggleFolderCommand` (persisted to `list_folders.is_collapsed`), and its badge is the sum of its children. `ReorderAsync` doubles as the move: a drop position implies a container, so dropping onto a row in another folder (or a top-level row) reassigns `FolderId` — that is the only way to drag a list *out*. `MoveToFolderAsync` is the drop-onto-the-header path (reaches collapsed/empty folders); `RemoveFromFolderCommand` is its context-menu counterpart. Both end in `PersistOrderAsync`, which writes the whole sidebar back as one global `sort_order` sequence (folder contents in folder order, then top level). Folders never nest.
 - **TasksIslandViewModel** — open/overdue/completed groups for the selected list with hierarchy-aware regrouping; task CRUD, drag-reorder, toggle done/star, schedule, enqueue/dequeue, cancel; review actions; planning session lifecycle; `RefineTask`, `OpenConPtySessionRequested`, `ToggleManual`, `SyncInteractiveSessions`; MyDay extras (`IsMyDayList`, `ClearDayCommand`, `ShowPrepLogCommand`) and the pinned Notes pseudo-row. Raises `NotesRequested`/`PrepRequested` for the shell.
 - **DetailsIslandViewModel** — the detail pane for a bound `TaskRowViewModel`. Owns live-log streaming (`Log` via `StreamLineFormatter`), debounced title/description editing, subtasks, the session-outcome/roadblock split, the three-tab work console (`output`/`git`/`session`), child surfacing (`ChildOutcomes` + `ChildrenNeedingAttention` drive an attention band on the Session tab), attachments, and the modes `IsNotesMode`/`IsPrepMode`/computed `IsTaskDetailVisible`. Failures raise `ErrorReported`, wired by the shell into `FlashFooterError`.
   - Three concerns are extracted into section VMs exposed as properties: `AgentSettings` (`AgentConfigEditorViewModel`, scope=Task), `MergeSectionViewModel`, `PrepPanelViewModel`. Helper rows live in the same file.
@@ -55,7 +56,7 @@ Design/         — Tokens.axaml (design tokens; merged before styles)
 | VM | Notes |
 |---|---|
 | `SettingsModalViewModel` | Four tabs: General, Worktrees, Files (prompt paths), Prime Claude. General hosts the per-model preset table (`ModelPresetRowViewModel`: effort + max turns per alias) which **replaced** the single global "Max turns" field. The Prime Claude tab gives each schedule row a three-way action radio group (Ping / Fill My Day / Custom) — `RadioButton.GroupName` is bound to a **per-row** `RadioGroup` string, since a shared group name would make every schedule share one selection. `DailyPrepMaxTasks` is disabled unless some row is `FillMyDay`. |
-| `ListSettingsModalViewModel` | Name, working dir, commit type, "manual list" flag, `VerifyCommand`, delete. Hosts the shared `AgentConfigEditorViewModel` as `Agent` (scope=List) — ⚠️ save delegates to `Agent.SaveAsync(verifyCommand)` because both land in the same `list_config` row via one `UpdateListConfig` call and would otherwise clobber each other. |
+| `ListSettingsModalViewModel` | Name, working dir, commit type, "manual list" flag, `VerifyCommand`, delete. Hosts the shared `AgentConfigEditorViewModel` as `Agent` (scope=List) — ⚠️ save delegates to `Agent.SaveAsync(verifyCommand)` because both land in the same `list_config` row via one `UpdateListConfig` call and would otherwise clobber each other. **Doubles as the folder editor:** `IsFolder` collapses the body to name + icon, and it's reached either via the create-only "create a folder instead" toggle (`CanToggleFolder`, set by `BeginLoad`) or via `BeginLoadFolder` on an existing folder. There is no list↔folder conversion. Creating a folder writes a `list_folders` row and **deletes the list row the create flow pre-created**, reporting it as `Deleted` so the caller does a full reload. |
 | `WeeklyReportModalViewModel` | Range pickers default "since last standup weekday → today", cached per range. |
 | `MergeHelperSelectionModalViewModel` | "Let Claude handle it" picker → [conpty-sessions](../../docs/explore-notes/conpty-sessions.md). |
 | `UsageMonitorModalViewModel` | Opened from the usage pill (shown **before** the data loads via `BeginLoad`); gauges are **dynamic** per `UsageSnapshotDto.Limits` row, and the 5h/7d ones carry three draggable stage markers (soft/hard/gate) via `UsageGaugeBar` + the pure `UsageThresholdDrag`, plus a colour-matched legend with a `NumericUpDown` per stage → [usage-monitoring](../../docs/explore-notes/usage-monitoring.md). The **analytics** part (models/tasks/cost) comes from the external TokenTracker export, not from us: without the CLI the modal shows a hint card with an install button (gated on Node ≥ 20) instead of the totals header. Gauges, gate and throttle are unaffected by it. The modal is **display + threshold drag only** — the PowerUse switch/window/handoff % it used to host moved to Settings → Execution (`GeneralSettingsTabViewModel`), and "Refresh now" is an icon in the titlebar via `ModalShell.HeaderActions` rather than a body row. |