refactor(webview): migrate provider identifiers in UI hooks

[WebMad]

Summary

Extracts the webview-ui/src/components/ui/hooks portion of #1141 into a focused pull request:

• canonicalizes provider checks and router-model keys in useSelectedModel
• canonicalizes Zoo Gateway router-model synchronization
• adds focused useSelectedModel coverage for dynamic, retired, local, and router-backed providers

These changes have been removed from #1141.

Related to #944.

Validation

• repository pre-commit lint passed
• repository pre-push type checks passed

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📥 Commits

Reviewing files that changed from the base of the PR and between 0ae9217 and 9be79da.

📒 Files selected for processing (3)

• webview-ui/src/components/ui/hooks/__tests__/useSelectedModel.spec.ts
• webview-ui/src/components/ui/hooks/useSelectedModel.ts
• webview-ui/src/components/ui/hooks/useZooGatewayRouterModelsSync.ts

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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