feat(gui): Remove Context Presets tab from Project Settings

Context Presets tab removed from Project Settings panel.
The _render_context_presets_panel method call is removed from the tab bar.
Context presets functionality will be re-introduced in Discussion Hub -> Context Composition tab.

config.toml

@@ -29,9 +29,9 @@ separate_tier4 = false
 separate_external_tools = false
 
 [gui.show_windows]
-"Context Hub" = false
-"Files & Media" = false
-"AI Settings" = false
+"Project Settings" = true
+"Files & Media" = true
+"AI Settings" = true
 "MMA Dashboard" = false
 "Task DAG" = true
 "Usage Analytics" = true
@@ -53,7 +53,7 @@ Theme = false
 Diagnostics = false
 "External Tools" = false
 "Shader Editor" = false
-"Session Hub" = true
+"Session Hub" = false
 
 [theme]
 palette = "Nord Dark"