feat: Update Vertex AI Claude Sonnet models to 1M context window#8685

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feat/vertex-1m-context-sonnet

Commits on Oct 16, 2025

feat: enable 1M context window for Claude Sonnet 4 and 4.5 on Vertex AI
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Commits on Oct 28, 2025

feat(vertex): add [1m] variants for Claude Sonnet models and send anthropic-beta header on Vertex; restore base to 200k and add tests
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fix(types): remove supportsComputerUse from Vertex [1m] variants to satisfy ModelInfo DTS build
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feat(vertex): region-aware pricing for Vertex Claude Sonnet 4/4.5 with [1m] tiered pricing by region; add tests in useSelectedModel
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feat(vertex): set [1m] Sonnet pricing to >200k tier and constrain VERTEX_REGIONS to documented set
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test(webview): restore full VERTEX_REGIONS to satisfy unit tests
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fix(vertex-pricing): default to under-200k; [1m] variants map to >200k tier; re-enable computer use on 1M variants; align UI logic with Bedrock 1M handling; tests pass
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fix(vertex): default to under-200k pricing; gate 1M beta header by [1m] or setting; keep Computer Use enabled on [1m]; normalize [1m] suffix for SDK
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chore(vertex): remove supportsComputerUse from [1m] variants to align with ModelInfo type
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