fix(external-editor): Move panel to Operations Hub, fix config key lookup

- Moved External Editor panel from AI Settings to External Tools tab in Operations Hub
- Fixed default_editor lookup to use nested [tools.default_editor] structure
- Added example entries for vscode, notepadpp, 10xEditor, rider, sublime
- Improved panel UI with section header and clearer formatting

config.toml

@@ -1,4 +1,4 @@
-[ai]
+[ai]
 provider = "minimax"
 model = "MiniMax-M2.5"
 temperature = 0.0
@@ -50,17 +50,17 @@ separate_external_tools = false
 Message = false
 Response = false
 "Tool Calls" = false
-Theme = false
+Theme = true
 "Log Management" = true
 Diagnostics = false
-"External Tools" = false
+"External Tools" = true
 "Shader Editor" = false
-"Undo/Redo History" = true
+"Undo/Redo History" = false
 
 [theme]
 palette = "Nord Dark"
-font_path = "fonts/Inter-Regular.ttf"
-font_size = 16.0
+font_path = "C:/projects/manual_slop/assets/fonts/MapleMono-Regular.ttf"
+font_size = 20.0
 scale = 1.0
 transparency = 1.0
 child_transparency = 1.0
@@ -85,3 +85,31 @@ chunk_overlap = 200
 [rag.vector_store]
 provider = "mock"
 collection_name = "manual_slop"
+
+[tools.text_editors]
+# Add your external editors here
+# Format: editor_name = "C:\\path\\to\\executable.exe"
+# Or use the structured format with diff_args
+
+[tools.text_editors.vscode]
+path = "C:\\path\\to\\code.exe"
+diff_args = ["--diff"]
+
+[tools.text_editors.notepadpp]
+path = "C:\\Program Files\\Notepad++\\notepad++.exe"
+diff_args = ["-multiInst", "-nosession"]
+
+[tools.text_editors.ten_x_editor]
+path = "C:\\path\\to\\10xEditor.exe"
+diff_args = []
+
+[tools.text_editors.rider]
+path = "C:\\path\\to\\rider64.exe"
+diff_args = []
+
+[tools.text_editors.sublime]
+path = "C:\\Program Files\\Sublime Text\\sublime_text.exe"
+diff_args = []
+
+[tools.default_editor]
+default_editor = "vscode"