Angular compiler: 100% fixture alignment (151/151) + test runner improvements

## Compiler Fixes

### Defer Block Alignment (17/17 fixtures)
- Add `ingest_defer_view` helper for defer block content generation
- Generate child template functions (Defer, DeferLoading, DeferPlaceholder, DeferError)
- Fix `ɵɵdefer()` signature to match Angular output
- Add flags calculation for hydrate triggers
- Fix slot propagation to defer ops

### i18n Implementation (16/16 fixtures)
- Fix i18n attribute detection and `I18nMeta::Message` creation
- Fix interpolation expression extraction and slot dependencies
- Add ICU placeholder generation with unique naming (VAR_PLURAL, VAR_PLURAL_1, etc.)
- Fix `i18n-*` attribute metadata propagation
- Add `I18nMeta::BlockPlaceholder` for control flow blocks inside i18n
- Fix nested ICU expression counting

## Compare Test Runner Improvements
- Fix ArrowFunctionExpr body handling (statement vs expression bodies)
- Fix findDeferBlocks to traverse ForLoopBlock.empty
- Fix TaggedTemplateLiteralExpr typo and LocalizedString placeholders
- Make expectedFeatures check stricter (track per-compiler features)
- Wire up skipReason for fixture skipping
- Remove unused expectFail feature

## Results
- Fixtures: 151/151 (100%)
- bitwarden-clients: 651/651 (100%)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: Brooooooklyn

crates/oxc_angular_compiler/src/ast/r3.rs

@@ -21,6 +21,9 @@ pub enum I18nMeta<'a> {
     Message(I18nMessage<'a>),
     /// Part of a containing message.
     Node(I18nNode<'a>),
+    /// Control flow block placeholder (for @if/@else/@for etc. inside i18n blocks).
+    /// Ported from Angular's `i18n.BlockPlaceholder`.
+    BlockPlaceholder(I18nBlockPlaceholder<'a>),
 }
 
 /// An i18n message containing translatable content.
@@ -860,6 +863,20 @@ pub struct R3DeferredBlockTriggers<'a> {
     pub never: Option<R3NeverDeferredTrigger>,
 }
 
+impl R3DeferredBlockTriggers<'_> {
+    /// Returns true if any trigger is set.
+    pub fn has_any(&self) -> bool {
+        self.when.is_some()
+            || self.idle.is_some()
+            || self.immediate.is_some()
+            || self.hover.is_some()
+            || self.timer.is_some()
+            || self.interaction.is_some()
+            || self.viewport.is_some()
+            || self.never.is_some()
+    }
+}
+
 /// A deferred block (`@defer`).
 #[derive(Debug)]
 pub struct R3DeferredBlock<'a> {

crates/oxc_angular_compiler/src/ir/ops.rs

@@ -1028,6 +1028,9 @@ pub struct DeferOp<'a> {
     pub own_resolver_fn: Option<OutputExpression<'a>>,
     /// SSR unique ID.
     pub ssr_unique_id: Option<Atom<'a>>,
+    /// Defer block flags (e.g., HasHydrateTriggers = 1).
+    /// Corresponds to `flags` in Angular TS's DeferOp.
+    pub flags: Option<u32>,
 }
 
 /// Defer trigger.