feat(handles): allow 1-48 bottom connection points via slider

Replaces the 4-option dropdown with a 1..48 slider. Existing handle IDs
('bottom', 'bottom-2'..'bottom-4') are preserved and the hand-tuned pixel
positions for counts 1..4 are locked in (regression-tested) so saved
canvases render identically. Counts >=5 use uniform spacing; node card
auto-grows in width so handles stay clickable. Existing edge-remap on
shrink scales unchanged thanks to its index-based loop.

ha-relevant: yes

frontend/src/components/canvas/__tests__/BaseNode.test.tsx

@@ -56,8 +56,9 @@ vi.mock('@/utils/propertyIcons', () => ({
 }))
 
 vi.mock('@/utils/handleUtils', () => ({
-  BOTTOM_HANDLE_IDS: ['bottom'],
-  BOTTOM_HANDLE_POSITIONS: { 1: [50] },
+  bottomHandleId: (idx: number) => idx === 0 ? 'bottom' : `bottom-${idx + 1}`,
+  bottomHandlePositions: () => [50],
+  clampBottomHandles: (n: unknown) => typeof n === 'number' ? n : 1,
 }))
 
 beforeEach(() => { mockZoom = 1 })

frontend/src/components/canvas/nodes/BaseNode.tsx

@@ -9,7 +9,7 @@ import { useThemeStore } from '@/stores/themeStore'
 import { THEMES } from '@/utils/themes'
 import { useCanvasStore } from '@/stores/canvasStore'
 import { maskIp, splitIps } from '@/utils/maskIp'
-import { BOTTOM_HANDLE_IDS, BOTTOM_HANDLE_POSITIONS } from '@/utils/handleUtils'
+import { bottomHandleId, bottomHandlePositions, clampBottomHandles } from '@/utils/handleUtils'
 
 interface BaseNodeProps extends NodeProps<Node<NodeData>> {
   icon: LucideIcon
@@ -56,7 +56,8 @@ export function BaseNode({ id, data, selected, icon: typeIcon, width, height }:
           ? `0 0 0 ${borderWidth}px ${colors.border}, 0 0 8px ${colors.border}44`
           : 'none',
         opacity: data.status === 'offline' ? 0.55 : 1,
-        minWidth: 140,
+        // Grow node width when many bottom handles so each stays clickable (~14px slot).
+        minWidth: Math.max(140, clampBottomHandles(data.bottom_handles ?? 1) * 14),
         width: width ? '100%' : undefined,
         height: height ? '100%' : undefined,
       }}
@@ -173,9 +174,9 @@ export function BaseNode({ id, data, selected, icon: typeIcon, width, height }:
         </>
       )}
 
-      {(BOTTOM_HANDLE_POSITIONS[data.bottom_handles ?? 1] ?? BOTTOM_HANDLE_POSITIONS[1]).map((leftPct, idx) => {
-        const sourceId = BOTTOM_HANDLE_IDS[idx]
-        const targetId = idx === 0 ? 'bottom-t' : `bottom-${idx + 1}-t`
+      {bottomHandlePositions(data.bottom_handles ?? 1).map((leftPct, idx) => {
+        const sourceId = bottomHandleId(idx)
+        const targetId = `${sourceId}-t`
         return (
           <span key={sourceId}>
             <Handle

frontend/src/components/modals/NodeModal.tsx

@@ -9,6 +9,7 @@ import { Select, SelectContent, SelectGroup, SelectItem, SelectLabel, SelectSepa
 import { NODE_TYPE_LABELS, type NodeData, type NodeType, type CheckMethod } from '@/types'
 import { resolveNodeColors } from '@/utils/nodeColors'
 import { ICON_REGISTRY, ICON_CATEGORIES, NODE_TYPE_DEFAULT_ICONS } from '@/utils/nodeIcons'
+import { MIN_BOTTOM_HANDLES, MAX_BOTTOM_HANDLES, clampBottomHandles } from '@/utils/handleUtils'
 
 const NODE_TYPE_GROUPS: { label: string; types: NodeType[] }[] = [
   { label: 'Hardware',       types: ['isp', 'router', 'firewall', 'switch', 'server', 'nas', 'ap', 'printer'] },
@@ -366,21 +367,24 @@ export function NodeModal({ open, onClose, onSubmit, initial, title = 'Add Node'
             {/* Bottom connection points (not for group containers) */}
             {form.type !== 'groupRect' && form.type !== 'group' && (
               <div className="flex flex-col gap-1.5 col-span-2">
-                <Label className="text-xs text-muted-foreground">Bottom Connection Points</Label>
-                <Select
-                  value={String(form.bottom_handles ?? 1)}
-                  onValueChange={(v) => set('bottom_handles', parseInt(v ?? '1', 10))}
-                >
-                  <SelectTrigger className={`bg-[#21262d] border-[#30363d] text-sm h-8 cursor-pointer ${modalStyles['modal-interactive']} ${modalStyles['modal-radius']}`} aria-label="Bottom connection points selector">
-                    <SelectValue />
-                  </SelectTrigger>
-                  <SelectContent className="bg-[#21262d] border-[#30363d]">
-                    <SelectItem value="1" className="text-sm">1 - center</SelectItem>
-                    <SelectItem value="2" className="text-sm">2 - left / right</SelectItem>
-                    <SelectItem value="3" className="text-sm">3 - left / center / right</SelectItem>
-                    <SelectItem value="4" className="text-sm">4 - evenly spaced</SelectItem>
-                  </SelectContent>
-                </Select>
+                <div className="flex items-center justify-between">
+                  <Label className="text-xs text-muted-foreground">Bottom Connection Points</Label>
+                  <span className="text-xs font-mono text-foreground">{clampBottomHandles(form.bottom_handles ?? 1)}</span>
+                </div>
+                <input
+                  type="range"
+                  min={MIN_BOTTOM_HANDLES}
+                  max={MAX_BOTTOM_HANDLES}
+                  step={1}
+                  value={clampBottomHandles(form.bottom_handles ?? 1)}
+                  onChange={(e) => set('bottom_handles', clampBottomHandles(Number(e.target.value)))}
+                  aria-label="Bottom connection points slider"
+                  className="w-full accent-[#00d4ff] cursor-pointer"
+                />
+                <div className="flex justify-between text-[10px] text-muted-foreground/60 font-mono">
+                  <span>{MIN_BOTTOM_HANDLES}</span>
+                  <span>{MAX_BOTTOM_HANDLES}</span>
+                </div>
               </div>
             )}
 

frontend/src/components/modals/__tests__/NodeModal.test.tsx

@@ -367,18 +367,37 @@ describe('NodeModal', () => {
 
   it('defaults bottom_handles to 1', () => {
     renderModal({ initial: BASE })
-    expect(selects()[2].value).toBe('1')
+    const slider = screen.getByLabelText('Bottom connection points slider') as HTMLInputElement
+    expect(slider.value).toBe('1')
   })
 
   it('pre-fills bottom_handles from initial', () => {
     renderModal({ initial: { ...BASE, bottom_handles: 3 } })
-    expect(selects()[2].value).toBe('3')
+    const slider = screen.getByLabelText('Bottom connection points slider') as HTMLInputElement
+    expect(slider.value).toBe('3')
   })
 
   it('submits updated bottom_handles', () => {
     const { onSubmit } = renderModal({ initial: BASE })
-    fireEvent.change(selects()[2], { target: { value: '4' } })
+    const slider = screen.getByLabelText('Bottom connection points slider') as HTMLInputElement
+    fireEvent.change(slider, { target: { value: '12' } })
     fireEvent.click(screen.getByRole('button', { name: 'Add' }))
-    expect((onSubmit.mock.calls[0][0] as Partial<NodeData>).bottom_handles).toBe(4)
+    expect((onSubmit.mock.calls[0][0] as Partial<NodeData>).bottom_handles).toBe(12)
+  })
+
+  it('supports the full 1..48 range', () => {
+    const { onSubmit } = renderModal({ initial: BASE })
+    const slider = screen.getByLabelText('Bottom connection points slider') as HTMLInputElement
+    expect(slider.min).toBe('1')
+    expect(slider.max).toBe('48')
+    fireEvent.change(slider, { target: { value: '48' } })
+    fireEvent.click(screen.getByRole('button', { name: 'Add' }))
+    expect((onSubmit.mock.calls[0][0] as Partial<NodeData>).bottom_handles).toBe(48)
+  })
+
+  it('clamps pre-filled out-of-range values into [1,48]', () => {
+    renderModal({ initial: { ...BASE, bottom_handles: 9999 } })
+    const slider = screen.getByLabelText('Bottom connection points slider') as HTMLInputElement
+    expect(slider.value).toBe('48')
   })
 })