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>

hyperstack/claude.sh

@@ -30,7 +30,7 @@ create_vm "${VM_NAME}" "${ENVIRONMENT}"
 verify_server_connectivity "${HYPERSTACK_VM_IP}"
 
 # 6. Install Claude Code
-log_warn "Installing Claude Code..."
+log_step "Installing Claude Code..."
 run_server "${HYPERSTACK_VM_IP}" "curl -fsSL https://claude.ai/install.sh | bash"
 
 # Verify installation succeeded
@@ -49,7 +49,7 @@ else
     OPENROUTER_API_KEY=$(get_openrouter_api_key_oauth 5180)
 fi
 
-log_warn "Setting up environment variables..."
+log_step "Setting up environment variables..."
 inject_env_vars_ssh "${HYPERSTACK_VM_IP}" upload_file run_server \
     "OPENROUTER_API_KEY=${OPENROUTER_API_KEY}" \
     "ANTHROPIC_BASE_URL=https://openrouter.ai/api" \
@@ -69,7 +69,7 @@ log_info "VM: ${VM_NAME} (ID: ${HYPERSTACK_VM_ID}, IP: ${HYPERSTACK_VM_IP})"
 echo ""
 
 # 9. Start Claude Code interactively
-log_warn "Starting Claude Code..."
+log_step "Starting Claude Code..."
 sleep 1
 clear
 interactive_session "${HYPERSTACK_VM_IP}" "export PATH=\$HOME/.local/bin:\$PATH && source ~/.zshrc && claude"