feat(firestore-multimodal-genai): Add support for Gemini 2.5 models

[HassanBahati]

Fixes #717

[Copilot]

Pull Request Overview

This PR adds support for Gemini 2.5 models to the firestore-multimodal-genai extension while removing deprecated Gemini models. The implementation updates both GoogleAI and VertexAI providers to include the new Gemini 2.5 model variants.

• Adds support for three new Gemini 2.5 models: FlashPreview0417, ProExp0325, and ProPreview0325
• Removes deprecated Gemini models including older experimental and preview versions
• Updates package dependencies to support the new models and removes outdated test configurations

Reviewed Changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
functions/src/generative-client/genkit.ts	Updates model imports and references to add Gemini 2.5 models and remove deprecated ones
functions/package.json	Upgrades genkit-ai dependencies from v1.3.0/v1.9.0 to v1.14.1
functions/tests/vertex_ai/index.test.ts	Updates test configuration to use gemini-2.5-pro instead of gemini-1.0-pro
functions/tests/vertex_ai/images.test.ts	Updates test configuration to use gemini-2.5-pro instead of gemini-1.0-pro
functions/tests/google_ai/index.test.ts	Updates test configuration to use gemini-2.5-pro instead of gemini-1.0-pro
functions/tests/google_ai/images.test.ts	Updates test configuration to use gemini-2.5-pro instead of gemini-1.0-pro
functions/tests/genkit/client.test.ts	Updates mock configurations to use gemini-2.5-pro instead of gemini-1.0-pro
extension.yaml	Bumps extension version from 1.0.4 to 1.0.5
CHANGELOG.md	Documents the addition of Gemini 2.5 support and removal of deprecated models

Files not reviewed (1)

• firestore-multimodal-genai/functions/package-lock.json: Language not supported

Comments suppressed due to low confidence (2)

firestore-multimodal-genai/functions/tests/genkit/client.test.ts:27

• The test mocks are using 'gemini25Pro' but the actual code imports 'gemini25FlashPreview0417', 'gemini25ProExp0325', and 'gemini25ProPreview0325'. The mock should reflect the actual model variants being used in the implementation.

  gemini25Pro: {name: 'googleai/gemini-2.5-pro', withVersion: jest.fn()},

firestore-multimodal-genai/functions/tests/genkit/client.test.ts:34

• The test mocks are using 'gemini25Pro' but the actual code imports 'gemini25FlashPreview0417', 'gemini25ProExp0325', and 'gemini25ProPreview0325'. The mock should reflect the actual model variants being used in the implementation.

  gemini25Pro: {name: 'vertexai/gemini-2.5-pro', withVersion: jest.fn()},

[cabljac]

• Can we double check the update to README to make sure it's accurate to what we're doing?
• Can we add a note to the model param in the extension.yaml to let people know about deprecation/retiring of models

[CorieW]

The new models don't seem to have been exported correctly in Genkit. Access them by using something like vertexAI.model(model) or googleAI.model(model).

For example: googleAI.model('gemini-2.5-pro'). This works.