Tool node canvas summary shows raw nodeId for file variable and empty for model-selector parameter

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### Dify version

1.16.1

### Cloud or Self Hosted

Self Hosted (Docker)

### Steps to reproduce

1. Create a custom tool plugin with a type: file parameter and a type: model-selector parameter in the tool YAML:
parameters:
- name: input_file
type: file
required: true
form: form
- name: model
type: model-selector
scope: llm
required: true
form: form

2. Add the tool node to a workflow/pipeline.
3. Bind input_file to an upstream File variable, and select a model for model.
4. Observe the node's canvas summary (the preview text at the bottom of the node card).

Root cause:

In web/app/components/workflow/nodes/tool/node.tsx, the generic rendering logic for tool node canvas summary doesn't properly handle:

1. Variable reference values (arrays): input_file's value is [nodeId, varName]. It's rendered via value.join(', '), which shows the raw nodeId. It
should resolve the nodeId to the upstream node's title and render with VariableLabelInNode (like document-extractor/node.tsx does).
2. Model object values: model's value is {provider, model, model_type, mode, completion_params} with type: "constant". None of the typeof checks match,
and the modelSelector type check fails because type is "constant", not FormTypeEnum.modelSelector. It should display value.model (or use ModelSelector
like llm/node.tsx).

Suggested fix:

In tool/node.tsx, add handling for:
- Array values that are variable references → use VariableLabelInNode (or at least show nodeTitle / varName instead of nodeId, varName)
- Object values with a model field → display value.model

Reference: document-extractor/node.tsx uses useNodes() + VariableLabelInNode; llm/node.tsx uses ModelSelector.

---

### ✔️ Expected Behavior

- input_file should display as File / file (upstream node title / variable name), like the built-in Document Extractor node does (using
VariableLabelInNode).
- model should display the model name (e.g. gemma4-31b), like the built-in LLM node does (using ModelSelector).

### ❌ Actual Behavior

- input_file displays as 1785719614025, file — the upstream node's ID (a raw number) is shown via Array.isArray(value) && value.join(', '), instead of
resolving it to the node title.
- model displays empty — the tool_configurations.model.value is an object {provider, model, ...} with type: "constant", which doesn't match any of the
three rendering branches (string / number / array) in tool/node.tsx, nor the modelSelector check (which expects type === FormTypeEnum.modelSelector).

Start in web/app/components/workflow/nodes/tool/node.tsx and trace the canvas-summary rendering for tool_configurations. Compare document-extractor/node.tsx for VariableLabelInNode and llm/node.tsx for model rendering. Done means file variables show the upstream node title and variable name, while model-selector parameters show the selected model name.

Written by the indexing model from the issue text.