fix: Anthropic Sonnet 4.5 model id + Bedrock 1M context checkbox

[daniel-lxs]

Summary:

• Correct Anthropic model id to official claude-sonnet-4-5 (resolves 404)
• Add single shared list for Bedrock models supporting 1M context (includes Sonnet 4 and 4.5)
• Show 1M context checkbox for Sonnet 4.5 in Bedrock settings

Key changes:

• packages/types/src/providers/anthropic.ts
• src/api/providers/anthropic.ts
• packages/types/src/providers/claude-code.ts
• packages/types/src/providers/bedrock.ts
• webview-ui/src/components/settings/providers/Anthropic.tsx
• webview-ui/src/components/settings/providers/Bedrock.tsx
• webview-ui/src/components/ui/hooks/useSelectedModel.ts
• src/api/providers/tests/anthropic.spec.ts

Validation:

• cd src && npx vitest run api/providers/tests/anthropic.spec.ts → passing
• cd src && npx vitest run api/providers/tests/bedrock.spec.ts → passing
• cd packages/types && npx tsc --noEmit → OK
• cd webview-ui && npx tsc --noEmit → OK

Notes:

• Vertex mapping remains unchanged (different id scheme).

---

Important

Fix Anthropic model ID to claude-sonnet-4-5 and add 1M context support for Bedrock models.

• Behavior:
  • Correct Anthropic model ID to claude-sonnet-4-5 in anthropic.ts, claude-code.ts, and anthropic.spec.ts.
  • Add BEDROCK_1M_CONTEXT_MODEL_IDS list in bedrock.ts for models supporting 1M context.
  • Show 1M context checkbox for Sonnet 4.5 in Anthropic.tsx and Bedrock.tsx.
• Validation:
  • Tests in anthropic.spec.ts updated to use claude-sonnet-4-5 and validate 1M context behavior.
  • TypeScript checks in packages/types and webview-ui pass without errors.
• Misc:
  • No changes to Vertex mapping as it uses a different ID scheme.

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[mrubens]

Do we still need this?

[daniel-lxs]

Nope

[roomote]

.