feat(ai): add responses api format support for custom chat models

[SwamiKedar]

Description

This PR adds support for the OpenAI/Azure Responses API format for custom AI chat models.

Previously, Bruno AI Chat only supported the Chat Completions API (POST /chat/completions) for custom models. However, newer Azure OpenAI models such as GPT-5-Codex only support the Responses API (POST /responses) and cannot be used with the existing implementation.

This change introduces support for both request formats by allowing the custom chat model configuration to specify the API format. The existing Chat Completions API remains the default to ensure full backward compatibility, while models that require the Responses API can now be configured accordingly.

This enables Bruno AI Chat to work seamlessly with newer Azure OpenAI deployments and other providers that expose the Responses API.

Related Issue: Closes #8773

Contribution Checklist:

• I've used AI significantly to create this pull request
• The pull request only addresses one issue or adds one feature.
• The pull request does not introduce any breaking changes
• I have added screenshots or gifs to help explain the change if applicable.
• I have read the contribution guidelines.
• Create an issue and link to the pull request.

Note: Keeping the PR small and focused helps make it easier to review and merge. If you have multiple changes you want to make, please consider submitting them as separate pull requests.

Publishing to New Package Managers

Summary by CodeRabbit

• New Features
  • Added per-model API format selection for OpenAI-compatible endpoints: Chat Completions or Responses.
  • Model selectors and the AI chat sidebar now indicate when the Responses API is active.
  • AI chat requests now use each model’s selected API format.
• Bug Fixes
  • Existing model configurations default to Chat Completions when no format is specified.
  • Added validation to prevent unsupported API format selections.

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• packages/bruno-electron/src/store/preferences.js

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Walkthrough

Adds selectable chat-completions and responses formats for AI models. Preferences, model metadata, chat submission, Electron IPC, and SDK dispatch now carry and apply the selected format. Existing models default to Chat Completions.

Changes

AI API format support

Layer / File(s)	Summary
API format configuration packages/bruno-app/src/components/Preferences/AI/*, packages/bruno-app/src/components/AiChatSidebar/index.js, packages/bruno-electron/src/store/preferences.js	Preferences validate and migrate apiFormat. Model settings select the format, and model labels identify Responses API entries.
Model metadata and dispatch packages/bruno-electron/src/ipc/ai/providers.js	Built-in and custom models expose API formats. getModel selects the Responses or Chat Completions SDK method.
Chat request propagation packages/bruno-app/src/providers/ReduxStore/slices/chat.js, packages/bruno-electron/src/ipc/ai/*	The selected format passes through Redux, IPC, resolveModel, and getModel during chat submission.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature · Severity of issue fixed: Medium

Sequence Diagram(s)

sequenceDiagram
  participant AiChatSidebar
  participant ReduxChat
  participant ElectronIPC
  participant ModelResolver
  participant VercelAISDK
  AiChatSidebar->>ReduxChat: submit selected model API format
  ReduxChat->>ElectronIPC: send renderer:ai-chat-stream payload
  ElectronIPC->>ModelResolver: resolve model with apiFormatOverride
  ModelResolver->>VercelAISDK: call responses or chat API

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Merge Risk: ⚪ Minimal · up to bc12d

No actionable merge-blocking risk is established by the available review evidence.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding Responses API support for custom AI chat models.
Linked Issues check	✅ Passed	The changes satisfy #8773. The configuration stores and validates apiFormat values chat-completions and responses. New and migrated models default to chat-completions. The UI provides the form…
Out of Scope Changes check	✅ Passed	The reported changes remain within #8773 scope. They update model configuration, validation, persistence, UI selection, IPC propagation, model resolution, and API dispatch for the requested Chat Compl…
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…

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_{Models choose their pathway bright
Chat or Responses, set just right
Preferences keep the format known
IPC carries what was shown
SDK calls follow the selected tone
Existing models keep their home}

_{Comment @coderabbitai help to get the list of available commands.}

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Actionable comments posted: 2

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@packages/bruno-app/src/components/Preferences/AI/CompatEndpointCard.js`:
- Around line 406-414: Add an accessible name to the API format select in the
model row by associating it with a visually hidden label or supplying a
descriptive aria-label that identifies the model’s API format; preserve the
existing value, change handler, options, and disabled behavior.

In `@packages/bruno-electron/src/ipc/ai/providers.js`:
- Around line 231-243: Validate apiFormatOverride/format in the provider
dispatch logic before selecting an API, allowing only 'chat-completions' and
'responses'. Throw a clear unsupported-format error for any other non-empty
value, while preserving the existing Responses API and Chat Completions dispatch
behavior for valid formats.

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Fix all unresolved CodeRabbit comments on this PR:

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• Create a new PR with the fixes

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📥 Commits

Reviewing files that changed from the base of the PR and between c70c5fe and f7f78bd.

📒 Files selected for processing (8)

• packages/bruno-app/src/components/AiChatSidebar/index.js
• packages/bruno-app/src/components/Preferences/AI/CompatEndpointCard.js
• packages/bruno-app/src/components/Preferences/AI/index.js
• packages/bruno-app/src/providers/ReduxStore/slices/chat.js
• packages/bruno-electron/src/ipc/ai/chat.js
• packages/bruno-electron/src/ipc/ai/index.js
• packages/bruno-electron/src/ipc/ai/providers.js
• packages/bruno-electron/src/store/preferences.js

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