feat(tooling): add lint-staged with Prettier + ESLint on pre-commit

- Install prettier, lint-staged, eslint-config-prettier
- Configure lint-staged in package.json: Prettier write on staged files, ESLint check on .ts/.html
- Add eslint-config-prettier to .eslintrc.json extends to disable formatting rules that conflict with Prettier
- Configure no-unused-vars to allow _ prefix (intentional destructuring pattern)
- Replace manual prettier/git update-index lines in pre-commit hook with npx lint-staged
- Fix pre-existing ESLint errors: remove unused imports in herowars-guildraid, fix useless escapes in middleware.ts, fix eslint-disable comment in utilityTypes.ts

.eslintrc.json

@@ -1,19 +1,21 @@
 {
     "root": true,
-    "ignorePatterns": [
-        "projects/**/*"
-    ],
-    "overrides": [{
-            "files": [
-                "*.ts"
-            ],
+    "ignorePatterns": ["projects/**/*"],
+    "overrides": [
+        {
+            "files": ["*.ts"],
             "extends": [
                 "eslint:recommended",
                 "plugin:@typescript-eslint/recommended",
                 "plugin:@angular-eslint/recommended",
-                "plugin:@angular-eslint/template/process-inline-templates"
+                "plugin:@angular-eslint/template/process-inline-templates",
+                "prettier"
             ],
             "rules": {
+                "@typescript-eslint/no-unused-vars": [
+                    "error",
+                    { "argsIgnorePattern": "^_", "varsIgnorePattern": "^_" }
+                ],
                 "@angular-eslint/directive-selector": [
                     "error",
                     {
@@ -33,13 +35,8 @@
             }
         },
         {
-            "files": [
-                "*.html"
-            ],
-            "extends": [
-                "plugin:@angular-eslint/template/recommended",
-                "plugin:@angular-eslint/template/accessibility"
-            ],
+            "files": ["*.html"],
+            "extends": ["plugin:@angular-eslint/template/recommended", "plugin:@angular-eslint/template/accessibility"],
             "rules": {}
         }
     ]