Refactor HTTP credential UI composition

[RhysSullivan]

Summary

• Standardizes HTTP credential UI around HttpCredentials: headers and query parameters now share the same value-source select, scope picker, and serialization path across GraphQL, MCP, and OpenAPI.
• Removes MCP's separate plaintext header editor; plaintext headers are now Plain value rows in the shared request credentials UI, while secret-backed values use Saved secret.
• Adds a shared OAuth connection/status control used by MCP and OpenAPI for the saved-to scope row plus idle/busy/connected/blocked status rendering. Provider-specific OAuth setup stays outside the shared control.
• Splits reusable secret creation into creatable-secret-picker and removes the old secret-header-auth / headers-list surfaces.

Tests

• bun run format:check
• bun run lint
• bun run typecheck
• git diff --check
• cd packages/react && bun run typecheck
• cd packages/react && bun run test -- src/plugins/http-credentials.test.ts src/plugins/credential-bindings.test.ts src/plugins/secret-helpers.test.ts
• cd packages/plugins/mcp && bun run test -- src/sdk/plugin.test.ts src/sdk/per-user-auth-isolation.test.ts src/sdk/connection-pool.test.ts src/react/defaults.test.ts
• cd packages/plugins/openapi && bun run test -- src/sdk/plugin.test.ts src/sdk/multi-scope-bearer.test.ts src/sdk/multi-scope-oauth.test.ts src/sdk/client-credentials-oauth.test.ts src/sdk/oauth-refresh.test.ts

Stack

1. Standardize source credential binding API #810
2. Share HTTP credential handling for source plugins #813
3. Refactor HTTP credential UI composition #815 👈 current
4. Share HTTP source credential editor #816

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