Fix Claude 4 Sonnet context window token count display

[roomote]

Fixes #5726

Problem

Claude 4 Sonnet was showing only 200k tokens instead of its actual 1 million token capacity in the context window display. This affected both the UI display and context condensing functionality.

Solution

Updated Claude 4 model definitions across all providers to reflect the correct 1M token context window:

• Anthropic provider: Updated claude-sonnet-4-20250514 and claude-opus-4-20250514 from 200k to 1M tokens
• Bedrock provider: Updated anthropic.claude-sonnet-4-20250514-v1:0 and anthropic.claude-opus-4-20250514-v1:0 from 200k to 1M tokens
• Vertex AI provider: Updated claude-sonnet-4@20250514 and claude-opus-4@20250514 from 200k to 1M tokens
• OpenRouter provider: Updated default model info from 200k to 1M tokens
• LiteLLM provider: Added logic to detect Claude 4 models and default to 1M tokens instead of 200k
• Tests: Updated test expectations to reflect correct 1M token context window

Files Changed

• packages/types/src/providers/anthropic.ts
• packages/types/src/providers/bedrock.ts
• packages/types/src/providers/vertex.ts
• packages/types/src/providers/openrouter.ts
• src/api/providers/fetchers/litellm.ts
• src/core/webview/__tests__/ClineProvider.spec.ts

Testing

• All existing tests pass
• Updated test expectations to verify 1M token context window
• Linting and type checking pass

---

Important

Update Claude 4 Sonnet models to reflect 1M token context window across multiple providers and update tests accordingly.

• Behavior:
  • Update context window for Claude 4 Sonnet models to 1M tokens in anthropic.ts, bedrock.ts, vertex.ts, openrouter.ts, and litellm.ts.
  • Update test expectations in ClineProvider.spec.ts to reflect 1M token context window.
• Providers:
  • Anthropic: Update claude-sonnet-4-20250514 and claude-opus-4-20250514.
  • Bedrock: Update anthropic.claude-sonnet-4-20250514-v1:0 and anthropic.claude-opus-4-20250514-v1:0.
  • Vertex AI: Update claude-sonnet-4@20250514 and claude-opus-4@20250514.
  • OpenRouter: Update default model info.
  • LiteLLM: Add logic to detect Claude 4 models and set context window to 1M tokens.
• Testing:
  • All existing tests pass.
  • Update test expectations to verify 1M token context window.

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