fix: persist manual node sizes and add width/height inputs

Nested vm/lxc/docker leaf nodes lost their size on reload: the
deserialize restore branch excluded those types entirely, so a
resized child snapped back to content-fit. Gate the restore on
container_mode instead of node type.

Also prefer explicit width/height over the DOM-measured value when
serializing, so a manual resize persists its exact target rather than
drifting to the fractional content-fit size.

Add a Size section to the detail panel with W/H number inputs
(setNodeSize store action, clamped to the resizer minimums). Inputs
resync live when the node is resized by corner drag, without
clobbering active keystrokes.

ha-relevant: yes

frontend/src/components/panels/__tests__/DetailPanel.test.tsx

@@ -36,6 +36,7 @@ function setupStore(nodeData: Partial<NodeData> = {}, serviceStatuses: Record<st
     snapshotHistory: vi.fn(),
     createGroup: vi.fn(),
     ungroup: vi.fn(),
+    setNodeSize: vi.fn(),
     serviceStatuses,
   }
   // Support both the bare destructure call and the selector-based call.
@@ -571,4 +572,69 @@ describe('DetailPanel', () => {
       expect(row?.textContent).not.toMatch(/Invalid Date/)
     })
   })
+
+  describe('Size section', () => {
+    function setupSized(node: Partial<Node<NodeData>>, setNodeSize = vi.fn()) {
+      const state = {
+        nodes: [{ ...makeNode({}), ...node }],
+        selectedNodeId: 'n1',
+        selectedNodeIds: [],
+        setSelectedNode: vi.fn(),
+        deleteNode: vi.fn(),
+        updateNode: vi.fn(),
+        snapshotHistory: vi.fn(),
+        createGroup: vi.fn(),
+        ungroup: vi.fn(),
+        setNodeSize,
+        serviceStatuses: {},
+      }
+      vi.mocked(canvasStore.useCanvasStore).mockImplementation(
+        ((sel?: (s: typeof state) => unknown) => (sel ? sel(state) : state)) as unknown as typeof canvasStore.useCanvasStore,
+      )
+      return setNodeSize
+    }
+
+    it('shows the current width/height, preferring explicit over measured', () => {
+      setupSized({ width: 220, height: 130, measured: { width: 999, height: 999 } })
+      render(<DetailPanel onEdit={vi.fn()} />)
+      expect((screen.getByLabelText('Width') as HTMLInputElement).value).toBe('220')
+      expect((screen.getByLabelText('Height') as HTMLInputElement).value).toBe('130')
+    })
+
+    it('falls back to the measured size before a resize', () => {
+      setupSized({ measured: { width: 187, height: 73 } })
+      render(<DetailPanel onEdit={vi.fn()} />)
+      expect((screen.getByLabelText('Width') as HTMLInputElement).value).toBe('187')
+      expect((screen.getByLabelText('Height') as HTMLInputElement).value).toBe('73')
+    })
+
+    it('commits a manual width on blur', () => {
+      const setNodeSize = setupSized({ width: 200, height: 100 })
+      render(<DetailPanel onEdit={vi.fn()} />)
+      const w = screen.getByLabelText('Width')
+      fireEvent.change(w, { target: { value: '260' } })
+      fireEvent.blur(w)
+      expect(setNodeSize).toHaveBeenCalledWith('n1', { width: 260 })
+    })
+
+    it('reverts invalid input without committing', () => {
+      const setNodeSize = setupSized({ width: 200, height: 100 })
+      render(<DetailPanel onEdit={vi.fn()} />)
+      const w = screen.getByLabelText('Width') as HTMLInputElement
+      fireEvent.change(w, { target: { value: 'abc' } })
+      fireEvent.blur(w)
+      expect(setNodeSize).not.toHaveBeenCalled()
+      expect(w.value).toBe('200')
+    })
+
+    it('resyncs the field when the node is resized by corner drag', () => {
+      setupSized({ width: 200, height: 100 })
+      const { rerender } = render(<DetailPanel onEdit={vi.fn()} />)
+      expect((screen.getByLabelText('Width') as HTMLInputElement).value).toBe('200')
+      // Simulate a corner-drag resize updating the store dimension.
+      setupSized({ width: 340, height: 100 })
+      rerender(<DetailPanel onEdit={vi.fn()} />)
+      expect((screen.getByLabelText('Width') as HTMLInputElement).value).toBe('340')
+    })
+  })
 })