Also install ftxui shared libraries from FetchContent

pipedal_kconfig links against libftxui-component.so, libftxui-dom.so,
and libftxui-screen.so built via FetchContent. Without explicit install
rules, these are missing after installation on distros that don't
provide ftxui as a system package (e.g. Arch), causing
'cannot open shared object file' at runtime.

Also update the comment to reflect all three dependency groups:
SQLiteCpp, libzip, and ftxui.

CMakeLists.txt

@@ -79,7 +79,8 @@ if(NOT PIPEDAL_DISABLE_COPYRIGHT_BUILD)
         DESTINATION /etc/pipedal/react/var/)
 endif()
 
-# Install SQLiteCpp and libzip shared libraries (their own install targets are disabled)
+# Install shared libraries from submodules and FetchContent dependencies
+# whose own install targets are disabled (SQLITECPP_INSTALL=OFF, LIBZIP_DO_INSTALL=OFF)
 install (
     FILES
         ${PROJECT_BINARY_DIR}/modules/SQLiteCpp/libSQLiteCpp.so.0
@@ -91,6 +92,13 @@ install (
         ${PROJECT_BINARY_DIR}/modules/libzip/lib/libzip.so.5
     DESTINATION ${CMAKE_INSTALL_PREFIX}/lib
 )
+install (
+    FILES
+        ${PROJECT_BINARY_DIR}/_deps/ftxui-build/libftxui-component.so.5.0.0
+        ${PROJECT_BINARY_DIR}/_deps/ftxui-build/libftxui-dom.so.5.0.0
+        ${PROJECT_BINARY_DIR}/_deps/ftxui-build/libftxui-screen.so.5.0.0
+    DESTINATION ${CMAKE_INSTALL_PREFIX}/lib
+)
 
 install (
     DIRECTORY ${PROJECT_SOURCE_DIR}/src/templates