fix(app-shell)!: a modal action is client-side only — drop the server fallthrough (objectstack#3959)

[os-zhuang]

The client half of objectstack-ai/objectstack#3959, resolved by option 2: type: 'modal' is client-side only.

Ships with objectstack-ai/objectstack#3974 (which rewrites app-todo's two mistyped actions). Order does not matter — neither half depends on the other, because the path being removed never worked.

What was removed, and why it was never real

modalActionHandler fell through to serverActionHandler when the action's target resolved to neither a page nor an object:

constdescriptor=schema!=null ? awaitresolveModalTarget(schema) : null;if(descriptor)returnmodalHandler(descriptor);returnserverActionHandler(action,context);// ← removed

Its docblock described that as "how a modal action bound to engine.registerAction(...) (or an inline body) still runs". It never ran. The framework's headlessActionTypeError rejects type: 'modal' over REST with a 400 — a modal action has no server dispatch, by design — so every trip down that branch ended in a confusing round-trip that could only fail.

Worse, it made a broken shape look supported: an app could register a handler for a modal action and see no complaint, shipping business logic that nothing could reach. app-todo's deferTask and setReminder sat dead for exactly this reason and are fixed in the framework PR.

What replaces it

An unresolvable target is reported as what it is — an authoring mistake — naming the action, the dud target, and the way out:

Action "log_call" is type:'modal' but its target "log_call" names no page or
object to open. Point it at a page, or use type:'script' with params to
collect input and run a handler.

type: 'script' with params is the supported way to collect input and then run server-side: the runner collects the same dialog, then the handler runs with those values. The framework docs' action-type table has been corrected to say so (it previously described modal as "collect input, then submit to a handler", contradicting its own REST table).

Superseded test

One case asserted the old fallthrough POSTed to /actions. It now asserts the refusal — including that the message names the action and points at script + params. The describe block's title carried the old contract too and is updated. 35/35 in the file.

🤖 Generated with Claude Code

https://claude.ai/code/session_01DTTKgYriDB6RVrkYjxxnG1

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✅ Console Performance Budget

Metric	Value	Budget
Main entry (gzip)	27.9 KB	350 KB
Entry file	index-CPAl_laG.js	—
Status	PASS	—

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📦 Bundle Size Report

Package	Size	Gzipped
app-shell (index.js)	8.20KB	2.97KB
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)	22.10KB	4.37KB
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)	35.76KB	9.11KB
auth (createAuthenticatedFetch.js)	4.37KB	1.69KB
auth (index.js)	2.25KB	1.01KB
auth (org-roles.js)	6.72KB	2.85KB
auth (phone-identifier.js)	1.11KB	0.66KB
auth (types.js)	0.59KB	0.35KB
auth (useAuth.js)	4.91KB	0.87KB
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
collaboration (useCommentSearch.js)	1.98KB	0.88KB
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core (index.js)	2.16KB	0.78KB
create-plugin (index.js)	9.28KB	2.98KB
data-objectstack (index.js)	129.96KB	32.71KB
fields (index.js)	221.06KB	54.17KB
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i18n (currency.js)	1.22KB	0.64KB
i18n (i18n.js)	4.32KB	1.77KB
i18n (index.js)	2.46KB	0.96KB
i18n (pickLocalized.js)	1.70KB	0.83KB
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i18n (useSafeTranslation.js)	3.26KB	1.44KB
layout (index.js)	38.45KB	10.67KB
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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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sdui-parser (codegen.js)	4.09KB	1.74KB
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types (form.js)	0.20KB	0.18KB
types (index.js)	1.86KB	0.91KB
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types (mobile.js)	0.20KB	0.18KB
types (navigation.js)	0.20KB	0.18KB
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)	5.04KB	1.93KB
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