perf(@angular/build): unify Oxc linking and optimization AST traversal passes

[alan-agius4]

Unifies Angular partial declaration linking and production AST optimizations into a single Oxc AST traversal pass.

Previously in transformJavaScriptImpl, when both linking (shouldLink) and production optimizations (advancedOptimizations) were active, Oxc parseSync was invoked twice per file, deserializing ASTs across the Rust/NAPI boundary twice and generating intermediate MagicString sourcemaps that required merging via @ampproject/remapping.

Changes

1. Unified AST Traversal (oxc-transform.ts):
   • Integrated Angular partial declaration linking into the oxc-transform visitor traversal.
   • When both linking and optimizations are requested, parseSync is invoked only once per file.
   • In CallExpression(node), the visitor checks for partial declarations (such as ɵɵngDeclareComponent) using the new OxcLinker class and links them in-place in the shared MagicString instance while continuing on to elide metadata and annotate top-level pure functions in the same traversal.
2. Encapsulated Linker (oxc-linker.ts):
   • Refactored oxc-linker.ts to export the OxcLinker class, encapsulating FileLinker, OxcAstHost, and InlineDeclarationScope with a clean linkCallExpression(node) method.
3. Worker Integration (javascript-transformer-worker.ts):
   • Replaced separate linkWithOxc and transformWithOxc calls with a single unified call to transformWithOxc.

[gemini-code-assist]

Code Review

This pull request refactors the Angular partial declaration linking process by integrating it directly into the unified OXC transformation pass, eliminating the need for a separate AST traversal. A new OxcLinker class is introduced to handle individual CallExpression nodes during the main traversal. Feedback focuses on optimizing this integration: first, by checking if a node is already edited before attempting to link it in oxc-transform.ts to prevent redundant operations and potential magic-string conflicts; second, by passing oxcLink instead of shouldLink to transformWithOxc in javascript-transformer-worker.ts to avoid duplicate linking when the Babel linker has already been executed.

[alan-agius4]

Changed Program and BlockStatement to 'Program:exit' and 'BlockStatement:exit' so that child AST nodes (like CallExpression) are visited before statement-level IIFE wrapping occurs.