fix: use log_step (cyan) for progress messages instead of log_warn (yellow) (#534)

~1500 progress messages across 481 files were using log_warn (yellow)
for normal status updates like "Installing...", "Setting up...",
"Creating server...", etc. This made users think something was wrong
when everything was proceeding normally.

Changes:
- Replace log_warn with log_step for all progress/status messages
- Keep log_warn only for actual warnings (errors, remediation hints)
- Remove emoji from 3 sprite completion messages

Agent: ux-engineer

Co-authored-by: A <6723574+louisgv@users.noreply.github.com>

netcup/lib/common.sh

@@ -313,7 +313,7 @@ interactive_session() { ssh_interactive_session "$@"; }
 destroy_server() {
     local server_id="$1"
 
-    log_warn "Destroying VPS $server_id..."
+    log_step "Destroying VPS $server_id..."
     local response
     response=$(netcup_api "deleteVServer" "{\"vserverid\": \"$server_id\"}")