Adds `ParseOptions::enable_ident_hashes` (default `true`) and `Ident::new_unhashed` in `oxc_str`, and turns it off in the parse-only paths of the `oxc-parser` napi crate and the JS/JSON formatters.

### Why

`Ident`'s precomputed hash (#19143) is a parse-time investment that pays off in semantic analysis — but parse-only consumers (parse + serialize, formatting) pay it for nothing. Profiling against other native parsers showed identifier hashing at 3.5-4.6% of parse time.

Measured on M-series (yuku-style native harness, 50 warmup + 300 runs, median):

| fixture | default | option off |
|---|---|---|
| react.development.js | 0.156 ms | 0.152 ms (−2.3%) |
| binder.ts | 0.383 ms | 0.370 ms (−3.5%) |
| App.tsx | 1.140 ms | 1.111 ms (−2.5%) |
| checker.ts | 7.862 ms | 7.499 ms (−4.6%) |
| typescript.js | 25.07 ms | 24.16 ms (−3.6%) |

### Contract

Unhashed `Ident`s store hash `0`; `Eq`/`Hash`/`ContentEq` include the stored hash, so unhashed and hashed `Ident`s of the same string do not compare equal. Semantic analysis (or anything relying on `Ident` hashing) must not run on an AST parsed with the option disabled. Default behavior is unchanged.

Every `Ident` the parser creates funnels through the `ParserImpl::ident()` helper, so the option applies uniformly. This covers identifiers lexed directly (`parse_identifier_kind`, `parse_private_identifier`) as well as those reconstructed from a `&str`/`Str` — import/export specifier locals, JSX element/member names, and the TS `intrinsic` type name — which would otherwise always be hashed through `Into<Ident>`.

On 64-bit platforms `Ident::new_unhashed` compiles to a no-op: an unhashed `Ident` has the same layout and bit representation as `&str`.

### Opt-outs

- **napi `oxc-parser`** ties `enable_ident_hashes` to whether semantic errors are requested. Both parse entry points run `SemanticBuilder` only when `showSemanticErrors` is set, so the common parse-and-serialize path skips hashing while the semantic-errors path keeps it. Serialized output is unchanged — the hash is internal to `Ident` and never emitted.
- **JS and JSON formatters** turn it off unconditionally: they never run semantic analysis and only read `Ident::as_str` / compare idents against string literals.

### 💥 BREAKING CHANGES

- 54cc121 ast: [**BREAKING**] Split `MetaProperty` into `ImportMeta` and
`NewTarget` (#24557) (camc314)

### 🚀 Features

- 4c71560 parser: More friendly error for spread element in dynamic
imports (#24705) (sapphi-red)
- 7b045cd minfier: Drop last break from last switch case (#24673)
(Armano)
- 7d3c178 minifier: Remove unreachable recursive functions (#24125)
(Dunqing)
- 94f99b3 ast: Allow `NONE` to be passed to AST builder methods where
`Option<ArenaVec>` is expected (#24629) (overlookmotel)
- 77230c5 ast: Accept arrays for `ArenaVec` params of AST builder
methods (#24621) (overlookmotel)
- f08b152 allocator: Implement `FromIn` for array to `Vec` conversion
(#24620) (overlookmotel)
- 2338c13 track-memory-allocations: Track heap deallocs, alloc bytes,
and peak growth (#24619) (Boshen)
- 7aa4739 syntax,transformer: Move JSX entity decoder to `oxc_syntax`
(#24617) (camc314)
- 2b097c4 str: Export `Str` as `ArenaStr` (#24604) (overlookmotel)
- 3acf4c1 minifier: Expand switch optimiation to remove empty cases
(#24520) (Armano)
- 129b759 parser: Improve diagnostics for unparenthesized LHS on
exponential expr (#24569) (camc314)
- 4d0c601 minifier: Fold arithmetic over undefined and null operands
(#24485) (Dunqing)
- 91541dd minifier: Drop empty switch statements  (#24527) (Armano)
- d05224d ast_visit: Generate VisitJs visitor that skips TypeScript
type-space (#24499) (Boshen)
- 3d22307 parser: Add `ParseOptions::enable_ident_hashes` (#24491)
(Boshen)

### 🐛 Bug Fixes

- 64c2241 minifier: Align class heritage removal with assumptions
(#24533) (Dunqing)
- 48b59f4 parser: Span ambient generator diagnostics (#24711) (camc314)
- e750a82 ecmascript: Fix false negative for may_have_side_effects on
dynamic property access (#24709) (sapphi-red)
- f145d73 minifier: Guard reordered identifier reads (#24698) (Dunqing)
- a2ef382 isolated-declarations: Reject `window.Symbol` as global symbol
reference (#24689) (camc314)
- b1bcf72 minifier: Invalidate facts for redeclared bindings (#24658)
(Dunqing)
- 921b834 minifier: Don't treat a conditionally-assigned var as
write-once (#24650) (Dunqing)
- 061af1f minifier: Avoid stale pure function summaries (#24636)
(Dunqing)
- 40c2f43 allocator: `Vec::from_array_in` do not allocate zero-length
array (#24628) (overlookmotel)
- 70994ae codegen: Preserve comments before expression operands (#24510)
(Dunqing)
- 7b4baff parser: Reject new import member access (#23459) (camc314)
- 128b385 minifier: Clippy warning with no-debug-assertions (#24547)
(camc314)
- 8421feb parser: Use first `as` span for imported name (#24537)
(leaysgur)
- c517aa0 parser: Reject invalid accessor assertions (#24504) (camc314)

### ⚡ Performance

- 884d9eb parser: Pre-size cover-grammar assignment target buffers
(#24683) (Boshen)
- d3f07a0 diagnostics: Box OxcDiagnosticInner to reduce binary size
(#24665) (Boshen)
- bcc9de0 parser: Defer diagnostic creation until parse exit (#24663)
(Boshen)
- c35d8ab allocator: Mark `ReplaceWith` panic path cold (#24515)
(camc314)
- ba65790 semantic, allocator: Branchless `clone_in` for semantic IDs
(#24564) (overlookmotel)
- 747feec parser: Build AST nodes with the AST builder instead of
cloning (#24540) (Boshen)
- ba35a0d react_compiler: Use IndexVec for dense id-keyed maps (#24549)
(Boshen)
- b685062 react_compiler: Keep small hot-path collections inline
(#24514) (Marius Schulz)
- a149e95 transformer: Outline rare expression exits (#24512) (camc314)
- 7808a6e react_compiler: Make aliasing effects cheap to intern and
clone (#24506) (Marius Schulz)
- 3a36f2a react_compiler: Store AbstractValue reasons as a u16 bitmask
(#24480) (Boshen)
- 1c96753 react_compiler: Use FxHashMap for the lookup-only aliasing
node map (#24490) (Boshen)

Co-authored-by: Cameron <[email protected]>

# Oxlint
### 💥 BREAKING CHANGES

- 54cc121 ast: [**BREAKING**] Split `MetaProperty` into `ImportMeta` and
`NewTarget` (#24557) (camc314)

### 🚀 Features

- 7b045cd minfier: Drop last break from last switch case (#24673)
(Armano)
- dd18383 linter/node: Implement no-top-level-await rule (#24634)
(Connor Shea)
- 16a65f2 linter/react: Implement function-component-definition rule
(#24471) (Cole Ellison)
- 7f1f585 linter: Reuse `jest/padding-around-test-blocks` for
`vitest/padding-around-test-blocks` (#24519) (Mikhail Baev)
- 99978a8 linter/import/consistent-type-specifier-style: Support
`prefer-top-level-if-only-type-imports` option (#24502) (camc314)

### 🐛 Bug Fixes

- 0184ad6 linter/unicorn/no-useless-undefined: Preserve valid parameter
defaults (#24686) (camc314)
- 8694167 linter/eslint/prefer-destructuring: Handle typed declarations
(#24616) (camc314)
- 477cf0f linter/eslint/no-throw-literal: Handle assigned errors
(#24561) (Cole Ellison)
- ac9200a linter: Detect React components from returned JSX (#24521)
(camc314)
- c0a6522 linter/eslint/no-useless-computed-key: Allow TS syntax in
computed keys (#24524) (Cole Ellison)

### ⚡ Performance

- 346eed1 linter/unicorn/prefer-event-target: Only run on `Class` and
`NewExpression` nodes (#24685) (Mikhail Baev)
- 7be5cf0 oxlint/lsp: Only invoke lint on code actions when document is
not opened (#24676) (Sysix)
- d3f07a0 diagnostics: Box OxcDiagnosticInner to reduce binary size
(#24665) (Boshen)
- 90ae040 linter/reporter/stylish: Compute diagnostic Info once per
diagnostic (#24525) (connorshea)

### 📚 Documentation

- e6f7174 linter/valid-expect: Fix correct example being identical to
incorrect one (#24468) (mkan0141)
# Oxfmt
### 💥 BREAKING CHANGES

- 54cc121 ast: [**BREAKING**] Split `MetaProperty` into `ImportMeta` and
`NewTarget` (#24557) (camc314)

### 🚀 Features

- 3d22307 parser: Add `ParseOptions::enable_ident_hashes` (#24491)
(Boshen)

### 🐛 Bug Fixes

- 6fe866a oxfmt: Keep tailwind classes glued to template expr with
`preserveWhitespace` (#24609) (leaysgur)
- 33e32d8 formatter_css: Use `line_suffix` for EOL line comment (#24580)
(leaysgur)
- 5f76998 formatter_graphql: Keep same line comments pending across
intervening tokens (#24579) (leaysgur)

Co-authored-by: Boshen <[email protected]>
Co-authored-by: Cameron <[email protected]>