Add Sorting & Launch Flutter App

My cross-platform Flutter app already pulls mixed content—text alongside images—from the backend and shows everything in a single list. What’s still missing is the last layer of polish before release.

Here’s what I need you to jump in and finish:

• List enhancements
 – Add reliable sorting (feel free to suggest the best default)
 – Introduce a Category filter, keeping future filters extensible
 – Wire up keyword search so results respect both the filter and sort order

• Quality sweep
 – Walk through all 6–7 screens, replicating real user flows
 – Tidy up any small bugs you uncover (no major refactors expected)

• Release prep
 – Generate a clean Android build (Play-ready)
 – Configure and test Flutter Web so it runs smoothly in modern browsers

Source code is version-controlled, backend endpoints are stable, and I’m on hand to answer API or UI questions quickly. Once these items are complete I’ll tag the release and push it live, so efficiency and clear commits are appreciated.