feat(flow-designer): nested-array columns in the node property form (#2678 P2-5)

[os-zhuang]

Closes the last open acceptance item of #2678 — P2-5: nested-array support in the flow designer. Everything else in the umbrella (OOO/quorum/per_group SDUI paths, decision attachments, the DeclaredActionsBar action-SDUI migration, viewer gating) already merged (#2681, #2692, #2697, #2710, #2719); each of those PRs explicitly deferred this one item.

The gap

The server-driven node property form (configSchema → FlowConfigField via json-schema-to-fields) maps an array-of-objects to an objectListrepeater, but a repeater column could only be a scalar (text/expression/boolean/select/reference). An item property that was itself an array (or object) fell through to a text column — which String()-joined the array (["a","b"] → "a,b") and corrupted it on save. So an engine-published nested-array node config was effectively un-editable in the designer.

What

A repeater column whose item property is an array now becomes a nested repeater (repeater-in-repeater):

• json-schema-to-fields — columnsFor maps an array-typed item property to a stringList / numberList / objectList column. Object-array columns derive their own nested columns recursively, bounded by a nesting cap so a pathological or (via inlined $ref) cyclic schema can't build a non-terminating form. Arrays that still aren't representable fall through to the prior text behavior — no regression.
• flow-node-config — FlowConfigColumn.kind gains stringList / numberList / objectList, plus a recursive columns? for nested objectList.
• FlowObjectListField — renders the nested columns via the shared FlowStringListField (string/number lists, with number[] coercion) and a recursive FlowObjectListField (object lists), round-tripping each cell as an array. numberList/objectList/stringList cells init to [], prune empty on flush, and commit as real arrays.

The one thing I did not change: the component's existing commit idiom (flush inside the setRows updater). Moving it out to fix React's dev-only "update a component while rendering a different component" warning trips the React-Compiler refs advisory (ref access must live inside the updater), which would break the repo's lint-delta-zero rule. The warning is pre-existing to this component — base triggers the identical one for its own objectList checkbox/select/remove controls — so the nested lists just inherit it; a clean fix is a separate, component-wide refactor.

Verification

• Unit — new mapper tests (string/number/object array-in-objectList → nested columns, recursive nested columns, nesting-cap bound) and new FlowObjectListField nested render + round-trip tests (nested stringList edit → string[]; numberList → number[] coercion; nested objectList row). Full inspector suite green (330 tests); typecheck clean; eslint delta zero.
• Browser (real inspector, no backend) — drove the console preview gallery flow designer with Playwright, mocking GET /api/v1/automation/actions to publish a configSchema with an array-in-objectList. Selecting the node rendered the objectList from the schema; adding a rule row rendered the nested Recipients (stringList), Retry offsets (numberList), and Escalations (objectList) editors inline; a nested recipient round-tripped (recipients[0] committed "oncall@example.com") and a nested Escalations row (After hours + Notify) rendered — a repeater-in-repeater, no drop to Advanced JSON.

Docs

content/docs/guide/flow-designer.md and packages/app-shell/README.md updated; changeset added (@object-ui/app-shell minor).

Refs

#2678 (P2-5) · #2681 / #2692 / #2697 / #2710 / #2719 (prior phases)

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✅ Console Performance Budget

Metric	Value	Budget
Main entry (gzip)	28.0 KB	350 KB
Entry file	index-DVS-DLb0.js	—
Status	PASS	—

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📦 Bundle Size Report

Package	Size	Gzipped
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app-shell (runtime-config.js)	7.42KB	2.32KB
app-shell (types.js)	0.01KB	0.04KB
app-shell (urlParams.js)	7.57KB	2.97KB
auth (AuthContext.js)	0.31KB	0.24KB
auth (AuthGuard.js)	1.17KB	0.53KB
auth (AuthProvider.js)	21.70KB	4.21KB
auth (AuthShell.js)	3.49KB	1.40KB
auth (ForgotPasswordForm.js)	12.12KB	3.41KB
auth (LoginForm.js)	17.86KB	5.29KB
auth (PreviewBanner.js)	0.90KB	0.50KB
auth (RegisterForm.js)	6.43KB	2.09KB
auth (SocialSignInButtons.js)	9.60KB	3.89KB
auth (UserMenu.js)	3.40KB	1.22KB
auth (auth-gate-events.js)	1.29KB	0.66KB
auth (authStyles.js)	5.04KB	1.72KB
auth (createAuthClient.js)	33.74KB	8.53KB
auth (createAuthenticatedFetch.js)	4.37KB	1.69KB
auth (index.js)	1.83KB	0.79KB
auth (phone-identifier.js)	1.11KB	0.66KB
auth (types.js)	0.59KB	0.35KB
auth (useAuth.js)	4.86KB	0.85KB
auth (useIsWorkspaceAdmin.js)	1.61KB	0.85KB
collaboration (CommentThread.js)	18.38KB	4.49KB
collaboration (LiveCursors.js)	3.17KB	1.27KB
collaboration (PresenceAvatars.js)	3.65KB	1.42KB
collaboration (PresenceProvider.js)	2.79KB	1.13KB
collaboration (index.js)	1.25KB	0.53KB
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create-plugin (index.js)	9.28KB	2.98KB
data-objectstack (index.js)	121.12KB	30.43KB
fields (index.js)	211.66KB	51.78KB
i18n (LocalizationContext.js)	1.76KB	0.96KB
i18n (currency.js)	1.22KB	0.64KB
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i18n (index.js)	2.46KB	0.96KB
i18n (pickLocalized.js)	1.70KB	0.83KB
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mobile (breakpoints.js)	1.51KB	0.70KB
mobile (createOfflineDataSource.js)	5.61KB	1.74KB
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mobile (offlineQueue.js)	3.91KB	1.35KB
mobile (pwa.js)	0.97KB	0.49KB
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plugin-editor (index.js)	2.46KB	1.10KB
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react (index.js)	1.00KB	0.55KB
sdui-parser (codegen.js)	4.09KB	1.74KB
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sdui-parser (parse.js)	10.04KB	2.82KB
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types (mobile.js)	0.20KB	0.18KB
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types (objectql.js)	0.20KB	0.18KB
types (overlay.js)	0.20KB	0.18KB
types (permissions.js)	0.20KB	0.18KB
types (plugin-scope.js)	0.20KB	0.18KB
types (record-components.js)	0.20KB	0.19KB
types (record-semantics.js)	1.28KB	0.67KB
types (registry.js)	0.20KB	0.18KB
types (reports.js)	0.20KB	0.18KB
types (spec-report.js)	5.26KB	1.96KB
types (system-fields.js)	2.39KB	1.17KB
types (theme.js)	0.20KB	0.18KB
types (ui-action.js)	0.75KB	0.46KB
types (views.js)	0.20KB	0.18KB
types (widget.js)	0.20KB	0.18KB

Size Limits

• ✅ Core packages should be < 50KB gzipped
• ✅ Component packages should be < 100KB gzipped
• ⚠️ Plugin packages should be < 150KB gzipped