Add unit tests for components, routes, and app config

[devin-ai-integration]

Summary

Adds 8 new Vitest unit test files covering the previously identified coverage gaps: components, route definitions, app config/initializer, and profile routes. Also adds zone.js as a dev dependency for the test infrastructure.

New test files (101 new tests):

• app.config.spec.ts — Tests initAuth() factory and window.__conduit_debug__ debug interface
• app.routes.spec.ts — Tests route definitions, guard configuration, and route count
• header.component.spec.ts — Tests auth-state-based navigation (loading, unauthenticated, authenticated, unavailable)
• auth.component.spec.ts — Tests login/register form, auth service integration, error handling, and navigation
• home.component.spec.ts — Tests feed toggling, tag filtering, page navigation, and auth redirect
• article.component.spec.ts — Tests article/comments loading, CRUD operations, favorite/follow toggling
• editor.component.spec.ts — Tests create/edit article modes, tag management, authorization redirect
• profile.routes.spec.ts — Smoke tests for profile child routes structure

Other changes:

• Added zone.js@0.16.1 as a dev dependency (required by Angular TestBed infrastructure)
• Updated test-setup.ts with improved error handling in try/catch

All 281 tests pass locally (14 test files, 180 existing + 101 new).

Review & Testing Checklist for Human

• Run bun run test to verify all 281 tests pass
• Spot-check that new test files follow the existing TestBed + vi.fn() pattern
• Verify no source code was modified (only test files, package.json, bun.lock, test-setup.ts)

Notes

• Uses provideRouter([]) instead of deprecated RouterTestingModule for Angular 21 compatibility
• Component tests use mock child components via overrideComponent to isolate the unit under test
• The IfAuthenticatedDirective requires isAuthenticated observable on UserService mocks

Link to Devin session: https://app.devin.ai/sessions/da36386cf4eb4b16b729e7e2656f6a79
Requested by: @WesternConcrete

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[devin-ai-integration]

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[devin-ai-integration]

Devin Review found 2 potential issues.

View 4 additional findings in Devin Review.

[devin-ai-integration]

🔴 @angular/core version mismatch with all other Angular packages causes peer dependency violations

@angular/core is bumped to 21.2.4 while every other @angular/* package remains at 21.1.1. The lockfile confirms exact peer dependency requirements: @angular/common@21.1.1, @angular/forms@21.1.1, @angular/animations@21.1.1, @angular/platform-browser@21.1.1, @angular/platform-browser-dynamic@21.1.1, and @angular/router@21.1.1 all require exactly @angular/core: "21.1.1". Additionally, @angular/core@21.2.4 has a peer dependency on @angular/compiler: "21.2.4" but only @angular/compiler@21.1.1 is installed. Angular requires all @angular/* packages to be at the same version; mixing versions can cause cryptic runtime errors (DI failures, change detection issues, template compilation problems).

(Refers to line 32)

Prompt for agents

The @angular/core package was bumped to 21.2.4 (likely by Dependabot) without updating the other Angular packages. All @angular/* packages must be kept at the same version. Either revert @angular/core back to 21.1.1 to match the other packages, or update ALL Angular packages (@angular/animations, @angular/common, @angular/compiler, @angular/forms, @angular/platform-browser, @angular/platform-browser-dynamic, @angular/router, @angular/build, @angular/cli, @angular/compiler-cli) to 21.2.4 simultaneously. The relevant files are package.json and bun.lock.

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[devin-ai-integration]

The @angular/core@21.2.4 version was already on the branch before this PR's changes (from the user's provided diff). This PR only added zone.js as a devDependency to package.json. The Angular version alignment is outside the scope of this test-only PR.