fix: emit syntheticHostListener for legacy animation host listeners

[ashley-hunter]

Summary

• Legacy animation host listeners (@HostListener('@trigger.phase') and host: { '(@trigger.phase)': '...' }) were compiled to plain ɵɵlistener, so @trigger events never routed through Angular's animation renderer.
• Classify @-prefixed host event names as ParsedEventType::LegacyAnimation in both component/transform.rs and directive/compiler.rs so the pipeline routes them through the synthetic-host path.
• Order legacy animation host listeners before regular listeners (priority 0 vs 1) to match Angular's CREATE_ORDERING.
• Emit ɵɵsyntheticHostListener("@trigger.phase", fn ComponentName_animation_<trigger>_<phase>_HostBindingHandler) from the reify phase, including correct chaining.
• Replace ListenerOp.animation_phase: Option<AnimationKind> with legacy_animation_phase: Option<Ident<'a>> so the raw phase string round-trips through the IR (matches Angular's parseLegacyAnimationEventName + splitAtPeriod semantics: trim both halves, lowercase the phase, preserve unknown phases verbatim).
• Switch sanitize_identifier to ASCII-only (is_ascii_alphanumeric) to match Angular's sanitizeIdentifier regex (/\W/g is ASCII-only in JavaScript).

Reproduction

@Component({
  selector: 'my-comp',
  template: '',
  host: { '(@animation.done)': 'done()' },
})
export class MyComponent {
  @HostListener('@animation.start')
  start() {}
  done() {}
}

Before: emitted ɵɵlistener(\"@animation.done\", ...).
After: emits the chained ɵɵsyntheticHostListener(\"@animation.done\", fn)(\"@animation.start\", fn) — byte-for-byte match against Angular's chain_synthetic_listeners.js compliance fixture.

Test plan

• Verified output against Angular's chain_synthetic_listeners, chain_synthetic_listeners_mixed, and animation_host_bindings compliance fixtures (all match)
• Added vitest cases covering @HostListener and host: { ... } syntax, ordering, @Directive parity, uppercase phase normalization, whitespace trimming, bogus-phase preservation, no-phase fallback to plain ɵɵlistener, and ASCII sanitize
• Added Rust unit tests for ListenerOp::is_legacy_animation and create_op_priority
• Full cargo test passes
• Full vitest suite passes
• cargo fmt --check, oxfmt --check, oxlint --type-aware --type-check all clean

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