improvement: FDI chart tool selection modes updated. shift+ and crtl+ both are assigned with a selection mode.

.cursor/skills/treatment-workspace/SKILL.md

@@ -40,7 +40,7 @@ Right-column entry uses `WizardStepper` (`components/ui/shared/WizardStepper.tsx
 
 | Step | UI | Notes |
 |------|-----|--------|
-| **Teeth** | `FdiToothChart` | Shift+click range; connected dots |
+| **Teeth** | `FdiToothChart` | Shift+click connected range; Ctrl/⌘+click single range; linked dots |
 | **Content** | `TreatmentDetailsEditor` fields only (`showChrome={false}`) | Type / notes / attachments — **no delete button** |
 | **Lab** | `LabCasesDispatchPanel` | Shown in stepper **only** when active detail type is lab-dependent (`labDependentCodes`) |
 
@@ -56,7 +56,9 @@ Right-column entry uses `WizardStepper` (`components/ui/shared/WizardStepper.tsx
 Helpers: `frontend/src/components/treatment/toothSelectionGroups.ts`. Persisted as `toothSelectionGroups` on the detail; lab tasks group by `selectionGroupId`.
 
 - **Plain click:** add/remove single; if tooth is in a **connected** group → drop the whole span and keep **only** that tooth as a single (no peel / no connected+single pair for the same span).
-- **Shift+click:** inclusive same-arch range between prior anchor and target; replaces overlapping groups. Prevent browser selection artifacts (`select-none`, Shift `preventDefault` on mousedown).
+- **Shift+click:** inclusive same-arch range → one **connected** group (linked dots above/below). Shift wins if Ctrl also held.
+- **Ctrl/⌘+click:** same range, but each tooth as its own **single** (one lab-dispatch row per tooth).
+- Prevent browser selection artifacts (`select-none`, modifier `preventDefault` on mousedown).
 - On group change, prune/remap `labCase.toothProsthesis` via `pruneToothProsthesisForGroups`.
 - Connected UI label: `ConnectedSelectionBadge` (shared `Badge` + primary tint) in dispatch + lab case lists.