fix: show error output when vp env setup --refresh fails

Previously, install.sh piped to /dev/null and install.ps1 piped to
Out-Null, silently swallowing errors. Now output is captured and
only displayed on failure, keeping success output quiet.

Author: fengmk2

packages/cli/install.ps1

@@ -193,13 +193,21 @@ function Setup-NodeManager {
     # Check if Vite+ is already managing Node.js (bin\node.exe exists)
     if (Test-Path "$binPath\node.exe") {
         # Already managing Node.js, just refresh shims
-        & "$BinDir\vp.exe" env setup --refresh | Out-Null
+        $setupOutput = & "$BinDir\vp.exe" env setup --refresh 2>&1
+        if ($LASTEXITCODE -ne 0) {
+            Write-Warn "Failed to refresh shims:"
+            Write-Host "$setupOutput"
+        }
         return "already"
     }
 
     # Auto-enable on CI environment
     if ($env:CI) {
-        & "$BinDir\vp.exe" env setup --refresh | Out-Null
+        $setupOutput = & "$BinDir\vp.exe" env setup --refresh 2>&1
+        if ($LASTEXITCODE -ne 0) {
+            Write-Warn "Failed to refresh shims:"
+            Write-Host "$setupOutput"
+        }
         return "true"
     }
 
@@ -208,7 +216,11 @@ function Setup-NodeManager {
 
     # Auto-enable if no node available on system
     if (-not $nodeAvailable) {
-        & "$BinDir\vp.exe" env setup --refresh | Out-Null
+        $setupOutput = & "$BinDir\vp.exe" env setup --refresh 2>&1
+        if ($LASTEXITCODE -ne 0) {
+            Write-Warn "Failed to refresh shims:"
+            Write-Host "$setupOutput"
+        }
         return "true"
     }
 
@@ -220,7 +232,11 @@ function Setup-NodeManager {
         $response = Read-Host "Press Enter to accept (Y/n)"
 
         if ($response -eq '' -or $response -eq 'y' -or $response -eq 'Y') {
-            & "$BinDir\vp.exe" env setup --refresh | Out-Null
+            $setupOutput = & "$BinDir\vp.exe" env setup --refresh 2>&1
+        if ($LASTEXITCODE -ne 0) {
+            Write-Warn "Failed to refresh shims:"
+            Write-Host "$setupOutput"
+        }
             return "true"
         }
     }

packages/cli/install.sh

@@ -430,14 +430,22 @@ setup_node_manager() {
   # Check if Vite+ is already managing Node.js (bin/node or bin/node.exe exists)
   if [ -e "$bin_path/node" ] || [ -e "$bin_path/node.exe" ]; then
     # Already managing Node.js, just refresh shims
-    "$vp_bin" env setup --refresh > /dev/null
+    local setup_output
+    if ! setup_output=$("$vp_bin" env setup --refresh 2>&1); then
+      warn "Failed to refresh shims:"
+      echo "$setup_output" >&2
+    fi
     NODE_MANAGER_ENABLED="already"
     return 0
   fi
 
   # Auto-enable on CI environment
   if [ -n "$CI" ]; then
-    "$vp_bin" env setup --refresh > /dev/null
+    local setup_output
+    if ! setup_output=$("$vp_bin" env setup --refresh 2>&1); then
+      warn "Failed to refresh shims:"
+      echo "$setup_output" >&2
+    fi
     NODE_MANAGER_ENABLED="true"
     return 0
   fi
@@ -450,7 +458,11 @@ setup_node_manager() {
 
   # Auto-enable if no node available on system
   if [ "$node_available" = "false" ]; then
-    "$vp_bin" env setup --refresh > /dev/null
+    local setup_output
+    if ! setup_output=$("$vp_bin" env setup --refresh 2>&1); then
+      warn "Failed to refresh shims:"
+      echo "$setup_output" >&2
+    fi
     NODE_MANAGER_ENABLED="true"
     return 0
   fi
@@ -463,7 +475,11 @@ setup_node_manager() {
     read -r response < /dev/tty
 
     if [ -z "$response" ] || [ "$response" = "y" ] || [ "$response" = "Y" ]; then
-      "$vp_bin" env setup --refresh > /dev/null
+      local setup_output
+    if ! setup_output=$("$vp_bin" env setup --refresh 2>&1); then
+      warn "Failed to refresh shims:"
+      echo "$setup_output" >&2
+    fi
       NODE_MANAGER_ENABLED="true"
     fi
   fi