Upgrade Flake Inputs

Update flake.lock to pull in the latest commits from all flake inputs. This gets you newer package versions without changing NixOS release channels.

What this does

• Updates all inputs to their latest commits (nixpkgs, home-manager, etc.)
• Does NOT change release channels (stays on same NixOS version)
• Safe operation - can always rollback

Process

1. Update the lock file

   just update
   

   This runs nix flake update and updates flake.lock.