Move concrete UI out of panels/ to their features

panels/ should hold only reusable UI infrastructure. Relocate the three
feature-specific things that were sitting in it:

- dev_gallery -> sbc/dev/gallery.rs (it is an editor, not a panel
  component; new top-level dev/ for developer-only editors)
- new_project_dialog -> sbc/project/ (a specific dialog owned by the
  project feature, not reusable)
- thumbnails -> sbc/objects/ (renders unit/feature def previews for the
  Objects grid; not used anywhere else)

asset_picker is now pub(crate) so the relocated new-project dialog can
still reach it. Removed the empty leftover panels/editors/ dir.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: gajop

native/src/sbc/panels/dev_gallery.rs native/src/sbc/dev/gallery.rsnative/src/sbc/panels/dev_gallery.rs renamed to native/src/sbc/dev/gallery.rs

@@ -0,0 +1,3 @@
+//! Developer-only editors, gated behind `SBC_DEV_PANEL=1`.
+
+mod gallery;

native/src/sbc/dev/mod.rs

@@ -4,6 +4,7 @@ mod chonsole;
 mod command_system;
 pub mod commands_api;
 pub(crate) mod compile;
+mod dev;
 mod devconsole;
 pub(crate) mod grass;
 pub(crate) mod heightmap;

native/src/sbc/mod.rs

@@ -5,6 +5,7 @@ mod model;
 mod selection;
 pub(crate) mod states;
 mod tests;
+pub(crate) mod thumbnails;
 mod ui;
 
 pub(crate) use commands::{AddObjectCommand, RemoveObjectCommand, SetObjectParamCommand};

native/src/sbc/objects/mod.rs

@@ -1,11 +1,11 @@
 use spring_native::prelude::{Error, NativeInterfaceRef};
 
 use crate::sbc::command_system::model::Models;
+use crate::sbc::objects::thumbnails::ThumbKind;
 use crate::sbc::objects::ui::filters::DefTraits;
 use crate::sbc::panels::field::{escape_rml, ChangeQueue, CommitRequest, InteractionQueue};
 use crate::sbc::panels::grid::GridItem;
 use crate::sbc::panels::runtime::{Behavior, Event, Item, Outcome, Phase, Watch};
-use crate::sbc::panels::thumbnails::ThumbKind;
 use crate::sbc::rml::element_by_id;
 use crate::sbc::states::StateRequest;
 

native/src/sbc/panels/thumbnails.rs native/src/sbc/objects/thumbnails.rsnative/src/sbc/panels/thumbnails.rs renamed to native/src/sbc/objects/thumbnails.rs

@@ -5,13 +5,13 @@ use std::rc::Rc;
 use spring_native::prelude::{Error, NativeInterfaceRef};
 
 use crate::sbc::command_system::model::Models;
+use crate::sbc::objects::thumbnails::ThumbnailRenderer;
 use crate::sbc::objects::ui::filters::{DefTraits, FEATURE_TYPES, TERRAINS, UNIT_TYPES};
 use crate::sbc::panels::grid::{GridItem, GridView};
 use crate::sbc::panels::runtime::{
     Brush, DynChoice, DynChoiceDef, EditorModel, FieldMut, FieldRef, Num, NumDef, StrChoice,
     StrChoiceDef,
 };
-use crate::sbc::panels::thumbnails::ThumbnailRenderer;
 use crate::sbc::states::PlacementConfig;
 use crate::sbc::teams::TeamManager;
 

native/src/sbc/objects/ui/definitions/behavior.rs

@@ -1,10 +1,9 @@
 mod action_dispatcher;
-mod asset_picker;
+pub(crate) mod asset_picker;
 pub(crate) mod brush;
 mod brush_sync;
 mod color_picker;
 mod cursortip;
-mod dev_gallery;
 mod drag_cursor;
 mod editor;
 pub(crate) mod editor_base;
@@ -17,10 +16,8 @@ pub(crate) mod grid;
 mod input;
 mod manager;
 mod modal_stack;
-mod new_project_dialog;
 pub(crate) mod registry;
 pub(crate) mod runtime;
-pub(crate) mod thumbnails;
 mod view;
 
 pub(crate) use manager::PanelManager;

native/src/sbc/objects/ui/definitions/model.rs

@@ -10,7 +10,7 @@ use crate::sbc::panels::asset_picker::AssetPicker;
 use crate::sbc::panels::color_picker::{ColorPicker, PickerEvent};
 use crate::sbc::panels::field::FieldValue;
 use crate::sbc::panels::file_dialog::FileDialog;
-use crate::sbc::panels::new_project_dialog::NewProjectDialog;
+use crate::sbc::project::new_project_dialog::NewProjectDialog;
 
 /// What a modal produced this tick, in the order it must be applied.
 pub(crate) enum ModalEvent {

native/src/sbc/panels/mod.rs

@@ -8,8 +8,8 @@ use crate::sbc::panels::asset_picker::AssetPicker;
 use crate::sbc::panels::color_picker::ColorPicker;
 use crate::sbc::panels::field::{bind_tooltip, element_by_id, escape_rml};
 use crate::sbc::panels::file_dialog::FileDialog;
-use crate::sbc::panels::new_project_dialog::NewProjectDialog;
 use crate::sbc::panels::registry::{editors_for, Tab};
+use crate::sbc::project::new_project_dialog::NewProjectDialog;
 use crate::sbc::rml;
 
 const UI_CONTEXT: &str = "sbc_native_ui";