Add basic ico support (#40822)

Closes https://github.com/zed-industries/zed/discussions/40763

<img width="867" height="1088" alt="Screenshot 2025-10-21 at 23 14 47"
src="https://github.com/user-attachments/assets/d691fb2a-afc6-4445-a335-054ef164e0d3"
/>

Also improves error handling on image open failure:

<img width="864" height="1083" alt="Screenshot 2025-10-21 at 23 14 30"
src="https://github.com/user-attachments/assets/d5388b61-995f-441b-b375-ad5136d1533b"
/>


Release Notes:

- Added basic ico support, improved unsupported image handling

crates/editor/src/editor_tests.rs

@@ -62,7 +62,7 @@ use util::{
 use workspace::{
     CloseActiveItem, CloseAllItems, CloseOtherItems, MoveItemToPaneInDirection, NavigationEntry,
     OpenOptions, ViewId,
-    invalid_buffer_view::InvalidBufferView,
+    invalid_item_view::InvalidItemView,
     item::{FollowEvent, FollowableItem, Item, ItemHandle, SaveOptions},
     register_project_item,
 };
@@ -26251,7 +26251,7 @@ async fn test_non_utf_8_opens(cx: &mut TestAppContext) {
 
     assert_eq!(
         handle.to_any().entity_type(),
-        TypeId::of::<InvalidBufferView>()
+        TypeId::of::<InvalidItemView>()
     );
 }
 

crates/editor/src/items.rs

@@ -42,7 +42,7 @@ use ui::{IconDecorationKind, prelude::*};
 use util::{ResultExt, TryFutureExt, paths::PathExt};
 use workspace::{
     CollaboratorId, ItemId, ItemNavHistory, ToolbarItemLocation, ViewId, Workspace, WorkspaceId,
-    invalid_buffer_view::InvalidBufferView,
+    invalid_item_view::InvalidItemView,
     item::{FollowableItem, Item, ItemBufferKind, ItemEvent, ProjectItem, SaveOptions},
     searchable::{
         Direction, FilteredSearchRange, SearchEvent, SearchableItem, SearchableItemHandle,
@@ -1392,8 +1392,8 @@ impl ProjectItem for Editor {
         e: &anyhow::Error,
         window: &mut Window,
         cx: &mut App,
-    ) -> Option<InvalidBufferView> {
-        Some(InvalidBufferView::new(abs_path, is_local, e, window, cx))
+    ) -> Option<InvalidItemView> {
+        Some(InvalidItemView::new(abs_path, is_local, e, window, cx))
     }
 }