fix(compiler): downlevel jit:true on anonymous classes too

[Brooooooklyn]

Summary

jit: true on an anonymous class fell through to AOT: the jit-forced dispatch was gated on class.id.is_some(), and whole-file JIT mode skipped nameless classes entirely.

Upstream nuance verified against vendored ngtsc sources: TypeScriptReflectionHost.isClass requires node.name, so anonymous decorated classes are never visited by the TraitCompiler — jitDeclarations.add is unreachable for them and no ɵfac/ɵcmp is emitted. Their decorators still downlevel through TypeScript's own decorator emit, which produces exactly the shape this change emits (let default_1 = class ...; default_1 = __decorate([...], default_1); export default default_1;), so routing anonymous jit classes through the existing jit-forced downlevel pipeline restores the net ngtsc output — no Ivy definition, __decorate for Angular + foreign decorators — with the added benefit of ctorParameters/propDecorators statics.

This change:

• Drops the class.id gates in both paths and synthesizes a name (default_N, TypeScript's own convention for anonymous default exports) when class.id is absent.
• Synthesized names avoid collisions via top_level_binding_names, which collects the file's imports (import x = require(), export * as X included) and top-level declaration bindings incl. destructured patterns and vars hoisted out of nested blocks/loops.
• jit_class_edits no longer searches for the class/abstract keywords inside decorator spans — class.span.start includes leading decorators, so a raw find("class") could land inside decorator text (e.g. @my.class(...)). For abstract classes only the abstract token after the last decorator is removed, since class expressions can't be abstract.
• Non-jit anonymous classes keep their previous behavior.
• A co-located @Injectable on an anonymous jit class still skips ɵfac/ɵprov — matching upstream, whose extractInjectableMetadata reads clazz.name.text and is unreachable for anonymous classes (they never reach the handler).

Test plan

• cargo test -p oxc_angular_compiler — 41 binaries green; cargo check --workspace clean.
• pnpm --filter @oxc-angular/compare compare --fixtures — 100% pass across all 23 categories.
• New tests: test_jit_true_anonymous_default_export (AOT jit:true), test_jit_mode_anonymous_default_export (options.jit), test_jit_true_anonymous_name_collision (default_1 taken → default_2), test_jit_true_abstract_class (named + anonymous abstract jit:true).

Fixes #549

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