chore: update dependencies (#84)

Patch-level updates only (no breaking API changes):
- @e4a/pg-js: 0.7.0 → 0.7.2
- country-flag-icons: 1.6.15 → 1.6.16
- prettier: 3.8.2 → 3.8.3
- rollup: 4.60.1 → 4.60.2
- svelte: 5.55.2 → 5.55.4

npm audit: 0 vulnerabilities. Build: clean. svelte-check: 0 errors.

Co-authored-by: dobby-yivi-agent[bot] <275734547+dobby-yivi-agent[bot]@users.noreply.github.com>

Author: dobby-coder[bot]