fix(linter): mark unused disable directive fix as suggestion (#18703)

## Summary
Changes the auto-fix for "unused disable directives" from a safe fix to a suggestion, preventing unintended removal of directives needed byother linters.

Fixes #17522

## Problem
The auto-fix for unused disable directives would automatically remove `eslint-disable` or `oxlint-disable` comments when running `oxlint --fix`. However, these directives might be:
1. Needed for ESLint when both linters are used
2. For JS plugins not yet supported by oxlint

## Solution
Changed the fix kind from `FixKind::Fix` to `FixKind::Suggestion` in:
- `crates/oxc_linter/src/context/host.rs` (line 323)
- `crates/oxc_linter/src/disable_directives.rs` (lines 118 and 141)

## Behavior Change
- **Before**: `oxlint --fix` automatically removes unused disable
directives
- **After**: The fix is a suggestion (requires `--fix-suggestions` to
apply)

## Test plan
- [x] All 11 tests in the `disable_directives` module pass
- [ ] Verify `--fix` no longer auto-removes disable directives
- [ ] Verify `--fix-suggestions` still applies the fix when desired

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

Co-authored-by: ddmoney420 <ddmoney420@users.noreply.github.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Cameron <cameron.clark@hey.com>

Author: 3 people

crates/oxc_linter/src/context/host.rs

@@ -320,7 +320,9 @@ impl<'a> ContextHost<'a> {
                             .with_label(span)
                             .with_severity(rule_severity),
                         PossibleFixes::Single(
-                            Fix::delete(span).with_kind(FixKind::Fix).with_message(fix_message),
+                            Fix::delete(span)
+                                .with_kind(FixKind::Suggestion)
+                                .with_message(fix_message),
                         ),
                     ));
                 }

crates/oxc_linter/src/disable_directives.rs

@@ -115,7 +115,7 @@ impl RuleCommentRule {
                 self.name_span.start - comma_before_offset,
                 self.name_span.end,
             ))
-            .with_kind(FixKind::Fix);
+            .with_kind(FixKind::Suggestion);
         }
 
         let after_source = &source_text[self.name_span.end as usize..comment_span.end as usize];
@@ -138,7 +138,7 @@ impl RuleCommentRule {
                 self.name_span.start,
                 self.name_span.end + comma_after_offset,
             ))
-            .with_kind(FixKind::Fix);
+            .with_kind(FixKind::Suggestion);
         }
 
         unreachable!(