refactor(webview): canonicalize provider model config identifiers

[WebMad]

Summary

Extracts the provider model configuration utility changes from #1141 into a focused pull request:

• canonicalizes provider registry keys in the settings model configuration utilities
• canonicalizes provider comparisons, docs slugs, and custom model UI entries
• adds focused coverage for canonical keys, Z.ai defaults, and model-change side effects

This PR is intentionally limited to webview-ui/src/components/settings/utils.

Validation

• npx vitest run src/components/settings/utils/__tests__/providerModelConfig.spec.ts — 29 tests passed
• pnpm check-types in webview-ui
• ESLint with --prune-suppressions --max-warnings=0 for both changed files
• repository pre-commit lint
• repository pre-push type checks
• git diff --check

Related to #944.
Extracted from #1141.

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📥 Commits

Reviewing files that changed from the base of the PR and between 0ae9217 and da51978.

📒 Files selected for processing (2)

• webview-ui/src/components/settings/utils/__tests__/providerModelConfig.spec.ts
• webview-ui/src/components/settings/utils/providerModelConfig.ts

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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