docs(issues): marcar 0025 y 0026 como completados + WIP master

Wave 1 de parallel-fix-issues integrada a master:
- 0025: text_editor_cpp_core + file_watcher_cpp_core
- 0026: gl_texture_load_cpp_gfx (vendor: stb_image v2.30)

Ademas se commitea WIP previo de master que estaba sin commitear (cambios
en shaders_lab, dag_*, framework, tokens, kpi_card, gl_loader.md, etc.)
para dejar HEAD buildable.

Notas:
- Algunos deps del gallery (button.cpp, toolbar.cpp, modal_dialog.cpp...)
  siguen UNTRACKED — gating con FN_BUILD_GALLERY=ON (default OFF) para
  que master build (sin flag) no los necesite.
- Build OK con y sin flag. fn index registra 904 functions.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cpp/apps/shaders_lab/CMakeLists.txt

@@ -14,12 +14,15 @@ add_imgui_app(shaders_lab
     ${CMAKE_SOURCE_DIR}/functions/gfx/dag_node_editor.cpp
     ${CMAKE_SOURCE_DIR}/functions/gfx/dag_palette.cpp
     ${CMAKE_SOURCE_DIR}/functions/gfx/dag_node_previews.cpp
-    ${CMAKE_SOURCE_DIR}/functions/core/fps_overlay.cpp
+    ${CMAKE_SOURCE_DIR}/functions/gfx/shaderlab_db.cpp
+    ${CMAKE_SOURCE_DIR}/functions/gfx/code_to_generator.cpp
+    # fps_overlay, panel_menu, layouts_menu, app_menubar ya viven en fn_framework
+    ${CMAKE_SOURCE_DIR}/functions/core/layout_storage_sqlite.cpp
 )
 target_include_directories(shaders_lab PRIVATE
     ${CMAKE_CURRENT_SOURCE_DIR}
 )
-target_link_libraries(shaders_lab PRIVATE imgui_node_editor)
+target_link_libraries(shaders_lab PRIVATE imgui_node_editor SQLite::SQLite3)
 
 if(WIN32)
     # GUI app: sin consola al lanzar (subsystem:windows / -mwindows)