feat(neovim): migrate user plugins from LazyVim to NvChad

When a LazyVim config is detected, user-added plugin files are now
salvaged before the old config is removed. Managed and LazyVim-specific
files are filtered out, and remaining plugins are restored into the new
NvChad config with LazyVim references stripped. Both frameworks use
lazy.nvim, so most plugin specs are directly compatible.

lib/neovim.sh

@@ -25,6 +25,11 @@ step "6/9 — Setting up NvChad"
 
 NVIM_CFG="$HOME/.config/nvim"
 NVCHAD_FRESH=false
+MIGRATED_PLUGINS_DIR="/tmp/archduino-migrated-plugins"
+rm -rf "$MIGRATED_PLUGINS_DIR"
+
+# Files managed by Archduino or LazyVim-specific — skip during migration
+SKIP_PLUGINS="gruvbox.lua|theme.lua|lsp.lua|arduino.lua|lspconfig.lua"
 
 # ── Detect existing config ──────────────────────────────────────
 if [[ -d "$NVIM_CFG/lua" ]]; then
@@ -32,8 +37,34 @@ if [[ -d "$NVIM_CFG/lua" ]]; then
     # NvChad detected — update in place
     info "Existing NvChad config detected, updating..."
   elif grep -rq "LazyVim" "$NVIM_CFG/lua/" 2>/dev/null || [[ -f "$NVIM_CFG/lazyvim.json" ]]; then
-    # LazyVim detected — migrate to NvChad
+    # LazyVim detected — salvage user plugins, then migrate
     warn "LazyVim config detected, migrating to NvChad..."
+
+    # Salvage user plugin files that aren't managed by us or LazyVim-specific
+    if [[ -d "$NVIM_CFG/lua/plugins" ]]; then
+      mkdir -p "$MIGRATED_PLUGINS_DIR"
+      for pfile in "$NVIM_CFG/lua/plugins/"*.lua; do
+        [[ ! -f "$pfile" ]] && continue
+        fname="$(basename "$pfile")"
+
+        # Skip our managed files
+        if [[ "$fname" =~ ^($SKIP_PLUGINS)$ ]]; then
+          continue
+        fi
+
+        # Skip files that are purely LazyVim-specific (extras imports, LazyVim core)
+        if grep -q 'import.*=.*"lazyvim' "$pfile" 2>/dev/null; then
+          continue
+        fi
+        if grep -q '"LazyVim/LazyVim"' "$pfile" 2>/dev/null && [[ $(wc -l < "$pfile") -lt 10 ]]; then
+          continue
+        fi
+
+        cp "$pfile" "$MIGRATED_PLUGINS_DIR/"
+        info "Salvaged plugin: $fname"
+      done
+    fi
+
     for d in "$NVIM_CFG" ~/.local/share/nvim ~/.local/state/nvim ~/.cache/nvim; do
       if [[ -d "$d" ]]; then
         backup_config "$d"
@@ -63,6 +94,21 @@ if $NVCHAD_FRESH; then
   info "NvChad starter cloned"
 fi
 
+# ── Restore migrated plugins ─────────────────────────────────────
+if [[ -d "$MIGRATED_PLUGINS_DIR" ]] && ls "$MIGRATED_PLUGINS_DIR"/*.lua &>/dev/null; then
+  mkdir -p "$NVIM_CFG/lua/plugins"
+  count=0
+  for pfile in "$MIGRATED_PLUGINS_DIR"/*.lua; do
+    # Strip any LazyVim-specific lines from the plugin spec
+    # (e.g. LazyVim opts overrides) but keep the rest intact
+    sed '/LazyVim\/LazyVim/d; /lazyvim\./d' "$pfile" > "$NVIM_CFG/lua/plugins/$(basename "$pfile")"
+    count=$((count + 1))
+  done
+  info "Migrated $count plugin file(s) from LazyVim to NvChad"
+  warn "Review migrated plugins in ~/.config/nvim/lua/plugins/ for compatibility"
+  rm -rf "$MIGRATED_PLUGINS_DIR"
+fi
+
 # ── Clear NvChad theme cache so the new theme takes effect ──────
 rm -rf ~/.local/share/nvim/lazy/base46/lua/base46/themes 2>/dev/null || true
 rm -rf ~/.cache/nvim/base46 2>/dev/null || true