[eric] tree: group Dashboard geometry helpers into geometry/

frontend/src/app/pages/Dashboard/DashboardCanvas.tsx

@@ -16,7 +16,7 @@ import type {
 import type { Output } from '@/shared/state/outputsSlice';
 import type { CardType, useDashboardSelection } from './useDashboardSelection';
 import type { useCanvasControls } from './useCanvasControls';
-import type { Tether } from './dashboardTethers';
+import type { Tether } from './geometry/dashboardTethers';
 
 type Selection = ReturnType<typeof useDashboardSelection>;
 type Canvas = ReturnType<typeof useCanvasControls>;

frontend/src/app/pages/Dashboard/TetherLayer.tsx

@@ -1,6 +1,6 @@
 import React from 'react';
 import type { ClaudeTokens } from '@/shared/styles/claudeTokens';
-import type { Tether } from './dashboardTethers';
+import type { Tether } from './geometry/dashboardTethers';
 
 const TETHER_FADE_MS = 2500;
 

frontend/src/app/pages/Dashboard/geometry/getCardRect.ts

@@ -1,5 +1,5 @@
 import { store } from '@/shared/state/store';
-import type { CardType } from './useDashboardSelection';
+import type { CardType } from '../useDashboardSelection';
 
 // Reads a card's rect straight from the live Redux store (collapsed height,
 // which is what the zoom math wants). Module-level + store.getState() so the

frontend/src/app/pages/Dashboard/useDashboardController.ts

@@ -4,11 +4,11 @@ import { useElementSelection } from '@/app/components/ElementSelectionContext';
 import { useCanvasControls } from './useCanvasControls';
 import { useDashboardSelection } from './useDashboardSelection';
 import { useDashboardSelectors } from './useDashboardSelectors';
-import { getCardRect } from './getCardRect';
-import { computeContentBounds } from './contentBounds';
+import { getCardRect } from './geometry/getCardRect';
+import { computeContentBounds } from './geometry/contentBounds';
 import { useDashboardUiState } from './useDashboardUiState';
 import { useLayoutSave } from './useLayoutSave';
-import { useTethers } from './dashboardTethers';
+import { useTethers } from './geometry/dashboardTethers';
 import { useArrowNav } from './useArrowNav';
 import { useDashboardShortcuts } from './useDashboardShortcuts';
 import { useDashboardClipboard } from './useDashboardClipboard';

frontend/src/app/pages/Dashboard/useDashboardThumbnail.ts

@@ -1,7 +1,7 @@
 import { useCallback, useEffect, useRef, type RefObject } from 'react';
 import { store } from '@/shared/state/store';
 import { updateDashboardThumbnail } from '@/shared/state/dashboardsSlice';
-import { captureDashboardThumbnail } from './captureDashboardThumbnail';
+import { captureDashboardThumbnail } from './geometry/captureDashboardThumbnail';
 
 interface UseDashboardThumbnailArgs {
   isActive: boolean;