chore: add support for gemini 3 pro preview

[uinstinct]

Description

https://hub.continue.dev/continuedev/gemini-3-pro-preview

resolves CON-4933

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Checklist

• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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Tests

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Summary by cubic

Adds support for Google Gemini 3 Pro Preview so users can configure and run gemini-3-pro-preview for chat and agent workflows. Addresses Linear CON-4933.

• New Features
  • Registered gemini-3-pro-preview in Gemini and CometAPI providers with context/token limits and chat recommendation.
  • Added Gemini 3 Pro to the Add New Model flow (model card and provider list).
  • Updated agent model recommendations to include Gemini 3 Pro.
  • Updated docs to recommend Gemini 3 Pro with a YAML example.

^{Written for commit e13c68d. Summary will update automatically on new commits.}

[continue]

Added documentation updates to include Gemini 3 Pro in:

• Model recommendations table for agent_plan and chat_edit roles
• Model capabilities reference table

These changes maintain consistency with the new Gemini 3 Pro support added in this PR.

[continue]

Updated seed scripts in remote-config-server to include Gemini 3 Pro Preview for local testing: https://github.com/continuedev/remote-config-server/pull/1811

[cubic-dev-ai]

No issues found across 7 files

[github-actions]

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I have read the CLA Document and I hereby sign the CLA

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2 out of 3 committers have signed the CLA.
✅ (uinstinct)[https://github.com/uinstinct]
✅ (RomneyDa)[https://github.com/RomneyDa]
❌ @continue
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[continue]

Added comprehensive test coverage for the isRecommendedAgentModel function to ensure the Gemini 3 Pro model recognition works correctly.

The tests cover:

• ✅ Gemini 3 Pro models (including the new gemini-3-pro-preview)
• ✅ Existing model families (OpenAI o1/o3/o4, DeepSeek R1, Claude 3.7+, etc.)
• ✅ Case insensitivity handling
• ✅ Edge cases (empty strings, partial matches, invalid models)
• ✅ Verification that only Pro models are recommended (not Flash)

The regex change from /2\.5/ to /2\.5|3/ now correctly matches both Gemini 2.5 and 3.x versions.

[sestinj]

🎉 This PR is included in version 1.7.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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