bug: IonTabs (standalone) imports the directives/proxies barrel, so every component lands in the initial chunk #31594

Ionic Framework Version

v9.x (9.0.8; also present on main)

Current Behavior

Per-component entry points (#31303, closing #30114) let a standalone app keep Ionic components that only lazy routes use out of the initial chunk. As soon as the app uses IonTabs, that no longer works.

packages/angular/src/standalone/navigation/tabs.ts imports from the barrel:

import { IonTabBar, IonTab } from '../directives/proxies';

directives/proxies re-exports every component proxy. Bundlers assign chunks by reachability, so an eager IonTabs (the usual tabs shell at the root route) pulls every Ionic component the app uses anywhere into the initial chunk. That includes fab, segment-button, datetime-button, reorder, infinite-scroll, card and grid, even when only lazy routes import them.

The code-splitting test app added in #31401 has no tabs (ion-app + ion-router-outlet only), so the test doesn't catch this.

Expected Behavior

Using IonTabs adds only the tabs, tab bar and tab code to the chunk that imports it.

Steps to Reproduce

1. Use a standalone app with an eager tabs shell (IonTabs in the root route's component) and several lazy routes that use other components (e.g. IonFab, IonSegmentButton, IonInfiniteScroll).
2. Import every component from its per-component entry (@ionic/angular/ion-fab, ...).
3. Run ng build --stats-json and inspect the initial chunk: the lazy-only components are in it, reached through navigation/tabs.js → directives/proxies.js.

Proposed fix

Import the two proxies from their own files, as the per-component entries already do:

import { IonTabBar } from '../directives/ion-tab-bar';
import { IonTab } from '../directives/ion-tab';

Measured on a real app (Angular 22, esbuild, ~100 routes) by applying this to the built dist/standalone/navigation/tabs.js:

Adding a tabs route to the code-split test app would cover this case.

Additional Information

provideIonicAngular also makes the modal and popover controllers eager (~84 kB raw in the same app), but that is a separate question.