chore(ai): upgrade SDK deps and pin analysis model

[RichardHruby]

Summary

Upgrades AI SDK dependencies and pins the login analysis model to a fixed snapshot for stable behavior.

• Bumped @ai-sdk/anthropic from ^3.0.28 to ^3.0.45
• Bumped ai from ^6.0.57 to ^6.0.92
• Updated lockfile transitive AI SDK packages (@ai-sdk/gateway, @ai-sdk/provider, @ai-sdk/provider-utils)
• Centralized the analysis model ID in agent.ts and pinned it to claude-sonnet-4-5-20250929

Changes

File	What
package.json	Upgraded top-level AI SDK dependencies
package-lock.json	Refreshed lockfile with resolved/transitive AI SDK versions
src/lib/ai-login/agent.ts	Added ANTHROPIC_ANALYSIS_MODEL constant and reused it in both generateText calls

Test plan

• npm run lint passes
• npm run build passes
• Start a login session and verify screen analysis still works for form/choice flows
• Confirm model selection uses pinned snapshot ID consistently in both analysis code paths

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
login-machine	Ready	Preview, Comment	Feb 19, 2026 9:19pm