Enable restrict-template-expressions linting rule (#7181)

* [AI] Promote typescript/restrict-template-expressions to error and fix violations

Convert the oxlint rule from "warn" to "error" and fix all 42 violations
by wrapping non-string template expressions with String(). This ensures
type safety in template literals across the codebase.

https://claude.ai/code/session_01Uk8SwFbD6HuUuo3SSMwU9z

* Add release notes for PR #7181

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

packages/loot-core/src/mocks/util.ts

@@ -76,7 +76,7 @@ export function patchFetchForSqlJS(baseURL: string) {
           },
         });
       }
-      return Promise.reject(new Error(`fetch not mocked for ${url}`));
+      return Promise.reject(new Error(`fetch not mocked for ${String(url)}`));
     },
   );
 }

packages/loot-core/src/server/api.ts

@@ -944,7 +944,7 @@ handlers['api/schedule-update'] = withMutation(async function ({
               break;
             default:
               throw APIError(
-                `Invalid amount operator: ${value}. Expected: is, isapprox, or isbetween`,
+                `Invalid amount operator: ${String(value)}. Expected: is, isapprox, or isbetween`,
               );
           }
           sched._conditions[amountIndex].op = convertedOp;

packages/loot-core/src/server/aql/compiler.ts

@@ -715,7 +715,11 @@ const compileOp = saveStack('op', (state, fieldRef, opData) => {
       // Dedupe the ids
       const ids = [...new Set(right)];
 
-      return `${left} IN (` + ids.map(id => `'${id}'`).join(',') + ')';
+      return (
+        `${String(left)} IN (` +
+        ids.map(id => `'${String(id)}'`).join(',') +
+        ')'
+      );
     }
     case '$like': {
       const [left, right] = valArray(state, [lhs, rhs], ['string', 'string']);

packages/loot-core/src/server/budget/category-template-context.ts

@@ -611,7 +611,7 @@ export class CategoryTemplateContext {
           monthUtils.addMonths(date, numPeriods * 12);
         break;
       default:
-        throw new Error(`Unrecognized periodic period: ${period}`);
+        throw new Error(`Unrecognized periodic period: ${String(period)}`);
     }
 
     //shift the starting date until its in our month or in the future

packages/loot-core/src/server/dashboard/app.ts

@@ -89,7 +89,7 @@ const exportModel = {
 
       if (!isWidgetType(widget.type)) {
         throw new ValidationError(
-          `Invalid widget.${idx}.type value ${widget.type}.`,
+          `Invalid widget.${idx}.type value ${String(widget.type)}.`,
         );
       }
 

packages/loot-core/src/server/util/custom-sync-mapping.ts

@@ -24,7 +24,7 @@ export const mappingsFromString = (str: string): Mappings => {
     );
   } catch (e) {
     const message = e instanceof Error ? e.message : e;
-    throw new Error(`Failed to parse mapping: ${message}`);
+    throw new Error(`Failed to parse mapping: ${String(message)}`);
   }
 };
 

packages/loot-core/src/shared/errors.ts

@@ -79,7 +79,7 @@ export function getDownloadError({
     default:
       const info =
         meta && typeof meta === 'object' && 'fileId' in meta && meta.fileId
-          ? `, fileId: ${meta.fileId}`
+          ? `, fileId: ${String(meta.fileId)}`
           : '';
       return t(
         'Something went wrong trying to download that file, sorry! Visit https://actualbudget.org/contact/ for support. reason: {{reason}}{{info}}',