fix: keep search dialog above page actions

[Kinfe123]

Summary

• move the command search overlay and dialog onto the framework modal layer
• keep React/Farm, Astro, Nuxt, and Svelte theme styles aligned
• add a cross-adapter regression test for search dialog layering

Verification

• pnpm --filter @farming-labs/theme test -- omni-layering.test.ts (215 tests)
• pnpm --filter @farming-labs/docs build
• pnpm --filter @farming-labs/theme typecheck
• pnpm --filter @farming-labs/theme build
• browser verification with the command palette open; overlay 9998, dialog 9999, no console errors

---

Summary by cubic

Raises the command search dialog's z-index so it no longer renders below elevated page actions across all framework adapters.

• Updates the overlay and dialog z-index from 50/51 to 9998/9999 in the Astro, Nuxt, Svelte, and React/Farm theme styles.
• Adds a cross-adapter regression test that verifies the omni.css files keep these z-index values aligned.

^{Written for commit 1cc7186. Summary will update on new commits.}

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commit: 1cc7186