Fix install script web setup to avoid bash compatibility issues

Replace nested if/fi with case statement and inline sed calls
instead of helper function. Add error handling for service install.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/install.sh

@@ -160,30 +160,32 @@ for example in target.conf.example remote.conf.example schedule.conf.example; do
 done
 
 # ── Web dashboard setup ─────────────────────────────────────
-_update_conf_key() {
-    local file="$1" key="$2" val="$3"
-    if grep -q "^${key}=" "$file" 2>/dev/null; then
-        sed -i "s|^${key}=.*|${key}=\"${val}\"|" "$file"
-    else
-        echo "${key}=\"${val}\"" >> "$file"
-    fi
-}
-
 read -rp "Enable web dashboard? (y/n) [n]: " enable_web
-if [[ "${enable_web,,}" == "y" ]]; then
-    _update_conf_key "$CONFIG_DIR/gniza.conf" "WEB_ENABLED" "yes"
+case "${enable_web}" in
+    y|Y)
+        # Update config
+        if grep -q "^WEB_ENABLED=" "$CONFIG_DIR/gniza.conf" 2>/dev/null; then
+            sed -i "s|^WEB_ENABLED=.*|WEB_ENABLED=\"yes\"|" "$CONFIG_DIR/gniza.conf"
+        else
+            echo 'WEB_ENABLED="yes"' >> "$CONFIG_DIR/gniza.conf"
+        fi
         # Generate random API key
         api_key=$(python3 -c "import secrets; print(secrets.token_urlsafe(32))")
-    _update_conf_key "$CONFIG_DIR/gniza.conf" "WEB_API_KEY" "$api_key"
+        if grep -q "^WEB_API_KEY=" "$CONFIG_DIR/gniza.conf" 2>/dev/null; then
+            sed -i "s|^WEB_API_KEY=.*|WEB_API_KEY=\"${api_key}\"|" "$CONFIG_DIR/gniza.conf"
+        else
+            echo "WEB_API_KEY=\"${api_key}\"" >> "$CONFIG_DIR/gniza.conf"
+        fi
         echo "Web API key: $api_key"
         echo "Save this key — you'll need it to log into the dashboard."
-    # Install systemd service
+        # Install systemd service (root only)
         if [[ "$MODE" == "root" ]]; then
-        "$INSTALL_DIR/bin/gniza" web install-service
+            "$INSTALL_DIR/bin/gniza" web install-service || warn "Failed to install web service"
         else
             warn "Systemd service installation requires root. Start manually: gniza web start"
         fi
-fi
+        ;;
+esac
 
 # ── Done ─────────────────────────────────────────────────────
 echo ""