feat(workflow): browse database steps by model (catalog drill-down)

[simlarsen]

Tames the catalog for good — a model → operation drill-down for database steps. The verifiable, zero-morph version of the "block collapse". Stacked on #2615.

What

Every database model that enables workflows adds ~11 near-identical components (Find/Create/Update/Delete + On-Create/Update/Delete). With hundreds of models the picker is an enormous flat list. This adds a "Work with database records" mode: pick a model, then pick the operation.

• Pure groupComponentsByModel(components, type) groups the real catalog components by their tableName (sorted by model name); filterModelGroups searches them.
• DatabaseStepPicker is the model → operation drill-down (searchable model grid, back nav, operation cards).
• ComponentsModal gets a "Work with database records" toggle (shown only when model-backed components exist for the current type); selecting an operation flows into the existing "Add to Workflow" selection — nothing else in the picker changes.

Why this is safe (vs the block-morph collapse)

No id is reconstructed or morphed. The picker hands back the exact component object the engine already knows (grouped by the real tableName those components carry). So there's zero fidelity risk — the failure mode the full block-collapse carried (a morphed id that doesn't resolve → a broken step) simply can't happen here.

Verification

• DatabaseStepUtils.test.ts: grouping by model, sort by name, static-component exclusion, trigger-vs-component separation, case-insensitive search.
• DatabaseStepPicker.test.tsx (RTL): lists models, drills into a model, selects an operation (returns the real component), back navigation.
• 114 workflow tests pass; tsc ✓, eslint ✓.
• Worth a 30-sec manual smoke-test: the toggle lives inside the existing ComponentsModal (a SideOver), which isn't exercised end-to-end in jsdom; the drill-down + grouping are unit/RTL-tested in isolation.

🤖 Generated with Claude Code

[simlarsen]

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