feat: update AI model options to support new Gemini versions

[skshmgpt]

This pull request updates the AI model options across the codebase to replace the older gemini-1.5 models with the new gemini-2.5 models.

Changes

Updated the model versions from gemini-1.5 to gemini-2.5

Benefits

New models have improved accuracy, so will provide better responses

Screenshots of changes

Before

After

• Have you followed the guidelines stated in README.md file?
• Have you checked to ensure there aren't any other open Pull Requests for the desired changed?

Summary by CodeRabbit

• New Features
  • Updated Google AI model options to include the latest Gemini 2.5 models for selection and use.
• Style
  • Refreshed labels for Google AI models in the configuration interface for improved clarity.
• Chores
  • Set the new Gemini 2.5 model as the default AI model.

[changeset-bot]

🦋 Changeset detected

Latest commit: 67c0493

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
syllabusx-client	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[coderabbitai]

Walkthrough

The changes update the supported Google Generative AI model versions throughout the codebase. All instances of the older "gemini-1.5-pro" and "gemini-1.5-flash" model identifiers are replaced with the newer "gemini-2.5-pro-exp-03-25" and "gemini-2.5-flash-preview-04-17" identifiers. This includes updates to model selection options in the UI, the default model in the application state, the schema enum definitions, and the backend logic that selects the AI provider. No other logic, control flow, or error handling has been altered.

Changes

File(s)	Change Summary
src/app/api/ai/route.ts	Updated Google AI model identifiers from "gemini-1.5-pro" and "gemini-1.5-flash" to "gemini-2.5-pro-exp-03-25" and "gemini-2.5-flash-preview-04-17". No logic changes.
src/components/ai/ConfigureAI.tsx	Updated Google model selection options and labels to use the new "gemini-2.5" versions.
src/hooks/use-ai.ts	Changed the default model in the store from "gemini-1.5-flash" to "gemini-2.5-flash-preview-04-17".
src/lib/schemas.ts	Replaced old model strings in the aiModels enum with the new "gemini-2.5" model strings.
.changeset/ninety-pants-yell.md	Added changeset file documenting the patch update for new Gemini AI model versions.

Poem

In fields of code where models grow,
The Gemini seeds we now outgrow—
2.5 blooms in lines anew,
Flash and Pro, with numbers true.
Rabbits hop, the future’s bright,
New models in our code take flight!
🐇✨

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📥 Commits

Reviewing files that changed from the base of the PR and between 550e154 and 67c0493.

📒 Files selected for processing (1)

• .changeset/ninety-pants-yell.md (1 hunks)

✅ Files skipped from review due to trivial changes (1)

• .changeset/ninety-pants-yell.md

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[ShouryaPal]

Hey @sakshamg567 ,
Thank you for your contribution. However, it looks like you haven't committed a changeset for the updates in your PR .Kindly follow the steps below:

• Run the command: npm changeset / pnpm changeset (depending on your package manager).
• Select the "patch" option.
• Use your previous commit message (the one associated with this PR) when prompted.
• After that, commit the changeset file with the message:
  chore: update changeset