feat(dashboard): add curation automation controls

[ScriptedAlchemy]

Stack

This is PR 4 of 5 replacing #114. It stacks on #129; review this PR against split/self-improving-03-dashboard-apis.

Summary

• Refactors the holographic curation page into focused curation components and hooks.
• Adds UI controls for automation config, scheduler status, run history, managed skills, fact proposals, snapshots, and action review.
• Adds savings diagnostics panel support plus shared dashboard primitive/style updates.
• Expands dashboard frontend tests for curation data, panel behavior, and shell SDK behavior.

Verification

• cargo fmt --all -- --check
• git diff --check
• CI on the original equivalent tip was green before splitting.

Replaces part of #114.

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