chore: configure repository editor settings (#7411)

## Description

Moves the repository-wide VS Code settings out of PR #7386 into a
dedicated pull request.

## Changes

- Configure Ruff for Python files and point it at the engine project
configuration.
- Add repository-root paths for stylelint and CSS/SCSS/Less at-rule
handling.
- Enable Oxc safe fixes on save for JavaScript and TypeScript files.
- Add Even Better TOML formatter settings for the repository's TOML
files.

This keeps PR #7386 focused on the Python tooling migration while
preserving the editor configuration as a separately reviewable change.

## Validation

- Exact file diff matches the settings change from PR #7386.
- `task pre-commit:whitespace` was attempted; it is currently blocked by
pre-existing whitespace issues in
`engine/src/stirling/models/tool_io.py` and
`engine/src/stirling/models/tool_models.py`.

.vscode/settings.json

@@ -135,13 +135,57 @@
   "html.format.indentHandlebars": true,
   "html.format.preserveNewLines": true,
   "html.format.maxPreserveNewLines": 2,
-  "stylelint.configFile": "devTools/.stylelintrc.json",
+  "stylelint.configFile": "${workspaceFolder}/devTools/.stylelintrc.json",
+  "css.lint.unknownAtRules": "ignore",
+  "scss.lint.unknownAtRules": "ignore",
+  "less.lint.unknownAtRules": "ignore",
   "java.project.sourcePaths": [
     "app/core/src/main/java",
     "app/common/src/main/java",
     "app/proprietary/src/main/java"
   ],
+  "[javascript]": {
+    "editor.codeActionsOnSave": {
+      "source.fixAll.oxc": "explicit"
+    }
+  },
+  "[javascriptreact]": {
+    "editor.codeActionsOnSave": {
+      "source.fixAll.oxc": "explicit"
+    }
+  },
   "[typescript]": {
-    "editor.defaultFormatter": "vscode.typescript-language-features"
+    "editor.defaultFormatter": "vscode.typescript-language-features",
+    "editor.codeActionsOnSave": {
+      "source.fixAll.oxc": "explicit"
+    }
+  },
+  "[typescriptreact]": {
+    "editor.codeActionsOnSave": {
+      "source.fixAll.oxc": "explicit"
+    }
+  },
+  "oxc.enable.oxlint": true,
+  "oxc.enable.oxfmt": false,
+  "oxc.configPath": "frontend/oxlint.config.ts",
+  "oxc.requireConfig": true,
+  "oxc.lint.run": "onType",
+  "oxc.fixKind": "safe_fix",
+  "[toml]": {
+    "editor.defaultFormatter": "tamasfe.even-better-toml",
+    // Keep TOML formatting compatible with .editorconfig and the pre-commit
+    // locale sorter. Key ordering itself is handled by task pre-commit:toml-sort.
+    "editor.insertSpaces": true,
+    "editor.tabSize": 4,
+    "editor.rulers": [127],
+    "evenBetterToml.formatter.alignEntries": false,
+    "evenBetterToml.formatter.alignComments": false,
+    "evenBetterToml.formatter.indentString": "    ",
+    "evenBetterToml.formatter.columnWidth": 127,
+    "evenBetterToml.formatter.reorderKeys": false,
+    "evenBetterToml.formatter.reorderArrays": false,
+    "evenBetterToml.formatter.reorderInlineTables": false,
+    "evenBetterToml.formatter.trailingNewline": true,
+    "evenBetterToml.formatter.crlf": false
   }
 }