build(deps): Bump @angular/common from 17.3.12 to 21.0.0 in /frontend

[dependabot]

Bumps @angular/common from 17.3.12 to 21.0.0.

Release notes

Sourced from @​angular/common's releases.

VSCode Extension: 21.0.0

• fix(language-service): address potential memory leak during project creation (89095946cf)
• fix(language-server): fix directory renaming on Windows (3f7111a9c3)

21.0.0

common

Commit	Description
	Add experimental support for the Navigation API (#63406)
	Support of optional keys for the KeyValue pipe (#48814)
	update to cldr 47 (#64032)
	properly type ngComponentOutlet (#64561)
	improve typing of ngComponentOutletContent (#63674)
	removengModuleFactory input of NgComponentOutlet (#62838)

compiler

Commit	Description
	don't choke on unbalanced parens in declaration block
	support arbitrary nesting in :host-context()
	support commas in :host() argument
	support complex selectors in :nth-child()
	support one additional level of nesting in :host()

compiler-cli

Commit	Description
	Adds diagnostic for misconfigured @defer triggers (#64069)
	enable type checking of host bindings by default (#63654)
	allow value to be set on radio fields
	capture metadata for undecorated fields (#63957)
	disallow compiling with the emitDeclarationOnly TS compiler option enabled (#61609)
	do not flag custom control required inputs as missing when field is present
	infer type of custom field controls
	infer types of signal forms set on native inputs
	make field detection logic more robust
	missingStructuralDirective diagnostic produces false negatives (#64579)
	remove internal syntax-related flags (#63787)
	report invalid bindings on form controls
	use any when checking field interface conformance

core

Commit	Description
	Add migration for zoneless by default. (#63042)
	Allow passing application providers in bootstrapModule options (#64354)
	introduce BootstrapContext for improved server bootstrapping (#63562)
	make SimpleChanges generic (#64535)
	support IntersectionObserver options in viewport triggers (#64130)
	support regular expressions in templates (#63887)
	control not recognized when input has directive injecting ViewContainerRef (#64368)

... (truncated)

Changelog

Sourced from @​angular/common's changelog.

21.0.0 (2025-11-19)

Blog post "Announcing Angular v21".

Breaking Changes

common

• (test only) - TestBed now provides a fake PlatformLocation implementation that supports the Navigation API. This may break some tests, though we have not observed any failures internally. You can revert to the old default for TestBed by providing the MockPlatformLocation from @angular/common/testing in your providers: {provide: PlatformLocation, useClass: MockPlatformLocation}
• ngComponentOutletContent is now of type Node[][] | undefined instead of any[][] | undefined.
• NgModuleFactory has been removed, use NgModule instead.

compiler-cli

• • Previously hidden type issues in host bindings may show up in your builds. Either resolve the type issues or set "typeCheckHostBindings": false in the angularCompilerOptions section of your tsconfig.
• The Angular compiler now produces an error when the the emitDeclarationOnly TS compiler option is enabled as this mode is not supported.

core

• The server-side bootstrapping process has been changed to eliminate the reliance on a global platform injector.

  Before:

  const bootstrap = () => bootstrapApplication(AppComponent, config);

  After:

  const bootstrap = (context: BootstrapContext) =>
    bootstrapApplication(AppComponent, config, context);

  A schematic is provided to automatically update main.server.ts files to pass the BootstrapContext to the bootstrapApplication call.

  In addition, getPlatform() and destroyPlatform() will now return null and be a no-op respectively when running in a server environment.

• Using a combination of provideZoneChangeDetection while also removing ZoneJS polyfills will no longer result in the internal scheduler being disabled. All Angular applications now consistenly use the same scheduler, and those with the Zone change detection provider include additional automatic scheduling behaviors based on

... (truncated)

Commits

• 00ffe91 refactor(common): removes unused NgModuleFactory config in NgComponentOutlet
• 8765b66 docs: add reference to Built-in Pipes in multiple pipe files
• ab98e71 fix(common): remove placeholder image listeners once view is removed
• 8ab0847 refactor(core): mark VERSION as @__PURE__ for better tree-shaking
• 650af71 refactor(http): migrate XSRF classes to use inject() function
• 3bed9f0 build: format md files
• a3c2fe8 Revert "refactor(common): Removes unused imports to clean up dependencies"
• 6d3e0f1 refactor(common): Removes unused imports to clean up dependencies
• 47578e0 refactor(common): remove redundant providedIn: 'root' from injection tokens
• 6de14b1 refactor(http): simplifies destruction tracking using destroyed property
• Additional commits viewable in compare view

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