feat(swift-ios): present the command drawer catalog

[saphid]

Summary

Adds the first production consumer of the command-drawer foundation from #7345.

• Builds a bounded, searchable catalog from existing workspace actions, projects, and recent threads.
• Renders the drawer, search field, scrim, empty state, and accessible result rows.
• Maps selections to existing typed WorkspaceView destinations.
• Wires the presentation over Home and open-thread workspace roots.

The parent PR owns geometry, gesture recognition, settling, keyboard bounds, and prior-responder restoration. This PR consumes that foundation without changing its lifecycle. Web, desktop, React Native mobile, server, contracts, providers, and persistence are unchanged.

Stack

GitHub cannot target this fork branch at an unmerged upstream PR, so the live upstream diff temporarily contains both layers. The presentation-only comparison is foundation 8b9a28d0a…consumer ac3404a32.

• Foundation head: 8b9a28d0a4f64a07a58e7553d59d444bbfa82841.
• Live consumer head: ac3404a32d20735bc28faab12a61e210b87c49c3.
• Live target: b67837984e5650888b1eed0e1cd7fff83625f696, contained in both heads.

Do not merge this draft before #7345 lands and the upstream file list shrinks to the four presentation files.

Validation

• Exact-head FeatureCommandDrawerTests and FeatureCommandDrawerPresentationTests: 59 passed, 0 failed, 0 skipped with real xcodebuild exit 0.
• Current-head GitHub checks, including contract fixtures and native tests, pass.
• Current review threads are resolved. This stack has no human maintainer approval.
• PR-only media is absent from the product diff. Earlier combined-implementation media has been removed because it did not prove this live diff.

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Implemented by GPT-5.6 Sol via the Codex harness.

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[saphid]

Closing this duplicate stack now that the complete drawer is consolidated and freshly proved in #7345. The #8350 head (ac3404a32) is an ancestor of #7345 head c1eef5a07; #7345 contains the full catalog/presentation diff plus the Home/thread entry, gesture lifecycle, exact responder restoration, scene-local review fix, 61 focused passing tests, and current-head media. No #8350-only file remains.