refactor(mcp): adopt shared primitives in Add/Edit source forms

[RhysSullivan]

3 of 5 — source-forms refactor stack (graphite copy of #189 by @mrzmyr). Stacks on #217.

Replaces the hand-rolled auth/URL/headers UI in the MCP Add/Edit forms with <AuthenticationSection>, wraps the save/cancel row in <FloatActions>, and uses <IOSSpinner> + <Textarea maxRows> for probe status and previews.

The biggest single form in the source-form suite (~820 LOC touched) — isolated so reviewers can focus on it without context-switching between plugins.

See #189 for full discussion.

Stack

1. feat(react): add UI primitives for source forms #216 feat(react): add UI primitives for source forms
2. feat(react): add <AuthenticationSection> primitive #217 feat(react): add <AuthenticationSection> primitive
3. (this PR) refactor(mcp): adopt shared primitives in Add/Edit source forms
4. refactor(sources): standardize openapi, graphql, google-discovery, onepassword forms
5. refactor(react): restructure sources list and sources-add container

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
🔵 In progress View logs	executor-marketing	56bb182	Commit Preview URL Branch Preview URL	Apr 13 2026, 07:21 AM

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