feat: sourcemap generation support (#18)

## Summary

- Propagate original source spans through HIR to codegen AST nodes,
enabling accurate source position tracking through the compilation
pipeline
- Generate sourcemaps via OXC codegen with post-processing line
adjustment to handle wrapper code (imports, function signatures) that
shifts compiled output
- Add `source_map` option to `PluginOptions`, NAPI bindings, and Vite
plugin
- Position-aware sourcemap adjustment with virtual source routing for
compiler-generated code (e.g. `useMemoCache` import, cache declarations)
- Support `debugId` (UUID v4) and `x_google_ignoreList` in sourcemap
output
- Remove 6 Category C cosmetic post-processing transforms that
interfered with sourcemap accuracy
- Strip comments inside compiled function bodies from codegen output

## Test plan

- [x] Unit tests for `adjust_sourcemap_positional` and
`collect_line_edits`
- [x] End-to-end sourcemap verification with full token dump
- [x] Identity mapping, HOC, monotonicity, and manual token verification
tests
- [x] 15 comprehensive sourcemap verification tests
- [x] Round-trip sourcemap tests for custom and shadcn fixtures
- [x] Sourcemap invariant tests for threshold, identity mapping,
columns, monotonicity
- [x] `cargo test --package oxc_react_compiler` passes
- [x] `cargo clippy` clean
- [x] `cargo fmt` clean

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

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: eve0415

.github/workflows/ci.yaml

@@ -32,6 +32,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          submodules: recursive
 
       - name: Setup Rust toolchain
         uses: actions-rust-lang/setup-rust-toolchain@150fca883cd4034361b621bd4e6a9d34e5143606 # v1.15.4
@@ -49,6 +51,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          submodules: recursive
 
       - name: Setup Rust toolchain
         uses: actions-rust-lang/setup-rust-toolchain@150fca883cd4034361b621bd4e6a9d34e5143606 # v1.15.4
@@ -148,6 +152,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          submodules: recursive
 
       - name: Setup Rust toolchain
         uses: actions-rust-lang/setup-rust-toolchain@150fca883cd4034361b621bd4e6a9d34e5143606 # v1.15.4