Upgrade simple-icons

Workflow

1. Record the current simple-icons version from package.json and pnpm-lock.yaml.
2. Install the latest package: pnpm add simple-icons@latest.
3. Reconcile icon imports:
   • Review common/icons/languageMapping.ts for imports from simple-icons.
   • Run pnpm lint or pnpm verify to surface missing icon exports.
4. If any previously used icon is missing after the upgrade:
   • Download the previous simple-icons version (recorded in step 1) to a temporary location or install it briefly.
   • Extract the icon data (title, slug, hex, path). In simple-icons, this is available from the si* export or icons/<slug>.json in the package.
   • Add a custom<IconName> entry to common/icons/customIcons.ts with the extracted data.
   • Update common/icons/languageMapping.ts to import and reference the custom icon.
   • Run pnpm lint:fix to fix import ordering issues if any.
   • Remove any temporary dependency or scratch folder after the data is captured.
5. Update relevant documentation if icon mappings or customization behavior changes.
6. Run pnpm verify before committing, and add a changeset for the upgrade.