chore(web): upgrade Vercel AI SDK from v5 to v6

[brendan-kellam]

Summary

• Update ai from ^5.0.121 to ^6.0.105
• Update all @ai-sdk/* provider packages to their latest major versions compatible with v6
• Update @openrouter/ai-sdk-provider from ^1.5.4 to ^2.2.3
• Rename LanguageModelV2 → LanguageModelV3 per the v6 API changes
• Fix Google Vertex thinking config provider options key (google → vertex)

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Upgraded to Vercel AI SDK v6 with coordinated major version updates across all AI provider packages—including Amazon Bedrock, Anthropic, Azure, Deepseek, Google, Google Vertex, Mistral, OpenAI, OpenRouter, and XAI—to maintain compatibility and ensure stable performance.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 7ea12a0 and ba75ef9.

⛔ Files ignored due to path filters (1)

• yarn.lock is excluded by !**/yarn.lock, !**/*.lock

📒 Files selected for processing (4)

• CHANGELOG.md
• packages/web/package.json
• packages/web/src/app/api/(server)/chat/route.ts
• packages/web/src/features/chat/actions.ts

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Walkthrough

Upgrades Vercel AI SDK and related provider packages (ai v5→v6, multiple @ai-sdk/* major bumps), updates code types from LanguageModelV2→LanguageModelV3, and renames the google-vertex providerOptions key from "google" to "vertex".

Changes

Cohort / File(s)	Summary
Changelog & Manifest CHANGELOG.md, packages/web/package.json	Added unreleased changelog entry; bumped multiple AI SDK dependencies including ai (v5→v6), @ai-sdk/* provider packages, and @openrouter/ai-sdk-provider.
Server API Route packages/web/src/app/api/(server)/chat/route.ts	Replaced import/type LanguageModelV2 → LanguageModelV3; updated CreateMessageStreamResponseProps.model type accordingly.
Chat Actions packages/web/src/features/chat/actions.ts	Updated _getAISDKLanguageModelAndOptions return types from AISDKLanguageModelV2 → AISDKLanguageModelV3 and renamed providerOptions key google → vertex for the google-vertex path.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• chore(web): Add PostHog LLM analytics #882: Modifies _getAISDKLanguageModelAndOptions in actions.ts, overlapping with type and model-selection changes in this PR.
• fix(ask_sb): Fix long generation times on first message in thread #447: Updates AISDK model types and provider option keys in the same chat model-resolution helper and route.
• feat(ask_sb): OpenAI compatible language models #424: Changes chat language-model handling and provider integrations in the same files (types and provider options).

Suggested reviewers

• msukkari

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch brendan/upgrade-vercel-ai-sdk-v6

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