[feat] Node replacement UI (#8604)

## Summary
Add node replacement UI to the missing nodes dialog. Users can select
and replace deprecated/missing nodes with compatible alternatives
directly from the dialog.

## Changes
- Classify missing nodes into **Replaceable** (quick fix) and **Install
Required** sections
- Add select-all checkbox + per-node checkboxes for batch replacement
- `useNodeReplacement` composable handles in-place node replacement on
the graph:
  - Simple replacement (configure+copy) for nodes without mapping
  - Input/output connection remapping for nodes with mapping
  - Widget value transfer via `old_widget_ids`
  - Dot-notation input handling for Autogrow/DynamicCombo
  - Undo/redo support via `changeTracker` (try/finally)
  - Title and properties preservation
- Footer UX: "Skip for Now" button when all nodes are replaceable (cloud
+ OSS)
- Auto-close dialog when all replaceable nodes are replaced and no
non-replaceable remain
- Settings navigation link from "Don't show again" checkbox
- 505-line unit test suite for `useNodeReplacement`

## Review Focus
- `useNodeReplacement.ts` — core graph manipulation logic
- `MissingNodesContent.vue` — checkbox selection state management
- `MissingNodesFooter.vue` — conditional button rendering (cloud vs OSS
vs all-replaceable)


[screen-capture.webm](https://github.com/user-attachments/assets/7dae891c-926c-4f26-987f-9637c4a2ca16)

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8604-feat-Node-replacement-UI-2fd6d73d36508148a371dabb8f4115af)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>

browser_tests/assets/missing/deprecated_nodes_complex.json

@@ -0,0 +1,205 @@
+{
+  "last_node_id": 7,
+  "last_link_id": 5,
+  "nodes": [
+    {
+      "id": 1,
+      "type": "T2IAdapterLoader",
+      "pos": [100, 100],
+      "size": [300, 80],
+      "flags": {},
+      "order": 0,
+      "mode": 0,
+      "inputs": [],
+      "outputs": [
+        {
+          "name": "CONTROL_NET",
+          "type": "CONTROL_NET",
+          "links": [],
+          "slot_index": 0
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "T2IAdapterLoader"
+      },
+      "widgets_values": ["t2iadapter_model.safetensors"]
+    },
+    {
+      "id": 2,
+      "type": "CheckpointLoaderSimple",
+      "pos": [100, 300],
+      "size": [315, 98],
+      "flags": {},
+      "order": 1,
+      "mode": 0,
+      "outputs": [
+        {
+          "name": "MODEL",
+          "type": "MODEL",
+          "links": [],
+          "slot_index": 0
+        },
+        {
+          "name": "CLIP",
+          "type": "CLIP",
+          "links": [],
+          "slot_index": 1
+        },
+        {
+          "name": "VAE",
+          "type": "VAE",
+          "links": [],
+          "slot_index": 2
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "CheckpointLoaderSimple"
+      },
+      "widgets_values": ["v1-5-pruned-emaonly-fp16.safetensors"]
+    },
+    {
+      "id": 3,
+      "type": "ResizeImagesByLongerEdge",
+      "pos": [500, 100],
+      "size": [300, 80],
+      "flags": {},
+      "order": 2,
+      "mode": 0,
+      "inputs": [
+        {
+          "name": "images",
+          "type": "IMAGE",
+          "link": null
+        }
+      ],
+      "outputs": [
+        {
+          "name": "IMAGE",
+          "type": "IMAGE",
+          "links": [1],
+          "slot_index": 0
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "ResizeImagesByLongerEdge"
+      },
+      "widgets_values": [1024]
+    },
+    {
+      "id": 4,
+      "type": "ImageScaleBy",
+      "pos": [500, 280],
+      "size": [300, 80],
+      "flags": {},
+      "order": 3,
+      "mode": 0,
+      "inputs": [
+        {
+          "name": "image",
+          "type": "IMAGE",
+          "link": 1
+        }
+      ],
+      "outputs": [
+        {
+          "name": "IMAGE",
+          "type": "IMAGE",
+          "links": [2, 3],
+          "slot_index": 0
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "ImageScaleBy"
+      },
+      "widgets_values": ["lanczos", 1.5]
+    },
+    {
+      "id": 5,
+      "type": "ImageBatch",
+      "pos": [900, 100],
+      "size": [300, 80],
+      "flags": {},
+      "order": 4,
+      "mode": 0,
+      "inputs": [
+        {
+          "name": "image1",
+          "type": "IMAGE",
+          "link": 2
+        },
+        {
+          "name": "image2",
+          "type": "IMAGE",
+          "link": null
+        }
+      ],
+      "outputs": [
+        {
+          "name": "IMAGE",
+          "type": "IMAGE",
+          "links": [4],
+          "slot_index": 0
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "ImageBatch"
+      },
+      "widgets_values": []
+    },
+    {
+      "id": 6,
+      "type": "SaveImage",
+      "pos": [900, 300],
+      "size": [300, 80],
+      "flags": {},
+      "order": 5,
+      "mode": 0,
+      "inputs": [
+        {
+          "name": "images",
+          "type": "IMAGE",
+          "link": 3
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "SaveImage"
+      },
+      "widgets_values": ["ComfyUI"]
+    },
+    {
+      "id": 7,
+      "type": "PreviewImage",
+      "pos": [1250, 100],
+      "size": [300, 250],
+      "flags": {},
+      "order": 6,
+      "mode": 0,
+      "inputs": [
+        {
+          "name": "images",
+          "type": "IMAGE",
+          "link": 4
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "PreviewImage"
+      },
+      "widgets_values": []
+    }
+  ],
+  "links": [
+    [1, 3, 0, 4, 0, "IMAGE"],
+    [2, 4, 0, 5, 0, "IMAGE"],
+    [3, 4, 0, 6, 0, "IMAGE"],
+    [4, 5, 0, 7, 0, "IMAGE"]
+  ],
+  "groups": [],
+  "config": {},
+  "extra": {
+    "ds": {
+      "scale": 1,
+      "offset": [0, 0]
+    }
+  },
+  "version": 0.4
+}

browser_tests/assets/missing/deprecated_nodes_simple.json

@@ -0,0 +1,186 @@
+{
+  "last_node_id": 5,
+  "last_link_id": 2,
+  "nodes": [
+    {
+      "id": 1,
+      "type": "Load3DAnimation",
+      "pos": [100, 100],
+      "size": [300, 100],
+      "flags": {},
+      "order": 0,
+      "mode": 0,
+      "outputs": [
+        {
+          "name": "MESH",
+          "type": "MESH",
+          "links": [],
+          "slot_index": 0
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "Load3DAnimation"
+      },
+      "widgets_values": ["model.glb"]
+    },
+    {
+      "id": 2,
+      "type": "Preview3DAnimation",
+      "pos": [450, 100],
+      "size": [300, 100],
+      "flags": {},
+      "order": 1,
+      "mode": 0,
+      "inputs": [
+        {
+          "name": "mesh",
+          "type": "MESH",
+          "link": null
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "Preview3DAnimation"
+      },
+      "widgets_values": []
+    },
+    {
+      "id": 3,
+      "type": "ConditioningAverage ",
+      "pos": [100, 300],
+      "size": [300, 100],
+      "flags": {},
+      "order": 2,
+      "mode": 0,
+      "inputs": [
+        {
+          "name": "conditioning_to",
+          "type": "CONDITIONING",
+          "link": null
+        },
+        {
+          "name": "conditioning_from",
+          "type": "CONDITIONING",
+          "link": null
+        }
+      ],
+      "outputs": [
+        {
+          "name": "CONDITIONING",
+          "type": "CONDITIONING",
+          "links": [1],
+          "slot_index": 0
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "ConditioningAverage "
+      },
+      "widgets_values": [1]
+    },
+    {
+      "id": 4,
+      "type": "SDV_img2vid_Conditioning",
+      "pos": [450, 300],
+      "size": [300, 150],
+      "flags": {},
+      "order": 3,
+      "mode": 0,
+      "inputs": [
+        {
+          "name": "clip_vision",
+          "type": "CLIP_VISION",
+          "link": null
+        },
+        {
+          "name": "init_image",
+          "type": "IMAGE",
+          "link": null
+        },
+        {
+          "name": "vae",
+          "type": "VAE",
+          "link": null
+        }
+      ],
+      "outputs": [
+        {
+          "name": "positive",
+          "type": "CONDITIONING",
+          "links": [],
+          "slot_index": 0
+        },
+        {
+          "name": "negative",
+          "type": "CONDITIONING",
+          "links": [],
+          "slot_index": 1
+        },
+        {
+          "name": "latent",
+          "type": "LATENT",
+          "links": [2],
+          "slot_index": 2
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "SDV_img2vid_Conditioning"
+      },
+      "widgets_values": [1024, 576, 14, 127, 25, 0.02]
+    },
+    {
+      "id": 5,
+      "type": "KSampler",
+      "pos": [800, 300],
+      "size": [300, 262],
+      "flags": {},
+      "order": 4,
+      "mode": 0,
+      "inputs": [
+        {
+          "name": "model",
+          "type": "MODEL",
+          "link": null
+        },
+        {
+          "name": "positive",
+          "type": "CONDITIONING",
+          "link": 1
+        },
+        {
+          "name": "negative",
+          "type": "CONDITIONING",
+          "link": null
+        },
+        {
+          "name": "latent_image",
+          "type": "LATENT",
+          "link": 2
+        }
+      ],
+      "outputs": [
+        {
+          "name": "LATENT",
+          "type": "LATENT",
+          "links": [],
+          "slot_index": 0
+        }
+      ],
+      "properties": {
+        "Node name for S&R": "KSampler"
+      },
+      "widgets_values": [42, "fixed", 20, 8, "euler", "normal", 1]
+    }
+  ],
+  "links": [
+    [1, 3, 0, 5, 1, "CONDITIONING"],
+    [2, 4, 2, 5, 3, "LATENT"]
+  ],
+  "groups": [],
+  "config": {},
+  "extra": {
+    "ds": {
+      "scale": 1,
+      "offset": [0, 0]
+    }
+  },
+  "version": 0.4
+}