cleanup: replace console.log/warn with $console, remove commented-out code

Removed various commented-out code and replaced direct `console.log` and `console.warn` usage across the codebase with `$console` from "core" for standardized logging. Also adjusted linting rules in biome.json to enable warnings for `console.log` usage.

app/src/core/utils/dates.ts

@@ -4,7 +4,6 @@ import weekOfYear from "dayjs/plugin/weekOfYear.js";
 declare module "dayjs" {
    interface Dayjs {
       week(): number;
-
       week(value: number): dayjs.Dayjs;
    }
 }