fix: allow custom Azure OpenAI model names

[wanxiankai]

Summary

• Preserve freeSolo string values from MUI Autocomplete in shared dropdown components.
• Keep custom async dropdown values visible when they do not match a predefined option.
• Allow the deprecated Azure OpenAI LLM node model selector to accept custom deployment/model names.

Validation

• corepack pnpm exec eslint packages/ui/src/ui-component/dropdown/AsyncDropdown.jsx packages/ui/src/ui-component/dropdown/Dropdown.jsx "packages/components/nodes/llms/Azure OpenAI/AzureOpenAI.ts"
• corepack pnpm --filter flowise-ui build
• corepack pnpm --filter flowise-components build

Closes #6590

[gemini-code-assist]

Code Review

This pull request enables free-text input (freeSolo mode) for the Azure OpenAI model name selection and updates the AsyncDropdown and Dropdown components to support custom string values. However, in both dropdown components, the underlying TextField has its value prop explicitly bound to internalValue, which locks the input and prevents users from typing custom values freely. The feedback suggests removing this binding and using a placeholder to let the Autocomplete component manage its typing state internally.

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[gemini-code-assist]

While enabling freeSolo is intended to allow custom text input, the underlying TextField (line 235) has value={internalValue} explicitly set. Because internalValue is only updated on onChange (when a selection is committed), this binding locks the input field and prevents users from typing custom values freely.

To fix this, the value={internalValue} prop should be removed from the TextField inside renderInput, allowing Autocomplete to manage the input's temporary typing state internally. You can use placeholder to show the default helper text instead:

placeholder={internalValue === 'choose an option' ? 'choose an option' : ''}

[gemini-code-assist]

While enabling freeSolo is intended to allow custom text input, the underlying TextField (line 58) has value={internalValue} explicitly set. Because internalValue is only updated on onChange (when a selection is committed), this binding locks the input field and prevents users from typing custom values freely.

To fix this, the value={internalValue} prop should be removed from the TextField inside renderInput, allowing Autocomplete to manage the input's temporary typing state internally. You can use placeholder to show the default helper text instead:

placeholder={internalValue === 'choose an option' ? 'choose an option' : ''}