image_viewer: Remove PDF annotation and form editing

The annotation and form-filling surface is being dropped, so remove it
end to end rather than leave it half-maintained.

pdf_viewer loses the editing APIs and everything only they used:
add_ink_annotation, add_highlight_annotation, delete_annotation,
apply_form_edits, the form widget and annotation extraction, the
PdfFormWidget/PdfFormEdit/PdfAnnotation types, the document
serialization helper, and the pdfium guards and constants those
functions were the sole users of. Rendering, text, links, outline and
metadata are untouched; annotation rendering stays on because it paints
markup already embedded in viewed documents.

image_viewer loses the tool palette, form widget overlays, inline form
editors, pen canvas, option menus, the annotate toolbar button, the
Undo Edit and Delete Annotation actions and their key bindings, plus
the associated state and handlers. Text selection, find, links,
thumbnails, outline, properties, rotation, presentation and Save a Copy
remain.

assets/keymaps/default-linux.json

@@ -1630,7 +1630,6 @@
       "ctrl-g": "image_viewer::FindNext",
       "ctrl-shift-g": "image_viewer::FindPrevious",
       "ctrl-s": "image_viewer::SaveCopyAs",
-      "ctrl-z": "image_viewer::UndoEdit",
       "ctrl-shift-t": "image_viewer::ToggleTextPanel"
     },
   },

assets/keymaps/default-macos.json

@@ -1682,7 +1682,6 @@
       "cmd-g": "image_viewer::FindNext",
       "cmd-shift-g": "image_viewer::FindPrevious",
       "cmd-s": "image_viewer::SaveCopyAs",
-      "cmd-z": "image_viewer::UndoEdit",
       "cmd-shift-t": "image_viewer::ToggleTextPanel"
     },
   },

assets/keymaps/default-windows.json

@@ -1605,7 +1605,6 @@
       "ctrl-g": "image_viewer::FindNext",
       "ctrl-shift-g": "image_viewer::FindPrevious",
       "ctrl-s": "image_viewer::SaveCopyAs",
-      "ctrl-z": "image_viewer::UndoEdit",
       "ctrl-shift-t": "image_viewer::ToggleTextPanel"
     },
   },

crates/pdf_viewer/README.md

@@ -52,8 +52,9 @@ A native, high performance PDF viewing engine and GPUI workspace item engineered
 ## 2. Scope Boundaries
 
 - **Continuous Scroll & Text Selection**: Supports fluid high frame rate document browsing and visual text selection.
-- **Excluded from initial scope**:
+- **Excluded from scope**:
   - Interactive PDF form field editing.
+  - Annotation authoring, editing and deletion.
 - *Rationale*: Delivering an ultra fast, stutter free viewing experience with zero UI locks takes precedence.
 
 ---

crates/pdf_viewer/src/pdf_viewer.rs

@@ -22,9 +22,8 @@ pub mod watcher;
 pub use cache::{CacheKey, CacheablePage, DEFAULT_MEMORY_BUDGET_BYTES, PageLruCache, RenderedPage};
 pub use document::{PageDimensions, PdfDocument};
 pub use pdfium::{
-    PdfAnnotationColor, PdfAnnotationInfo, PdfAnnotationKind, PdfCharBox, PdfDocumentDetails,
-    PdfFormEdit, PdfFormWidget, PdfFormWidgetKind, PdfLinkAnnotation, PdfMetadata, PdfOutlineItem,
-    PdfPageDetails, PdfTextSegment, PdfiumEngine,
+    PdfCharBox, PdfDocumentDetails, PdfLinkAnnotation, PdfMetadata, PdfOutlineItem, PdfPageDetails,
+    PdfTextSegment, PdfiumEngine,
 };
 pub use rasterizer::{LuminosityToneMapper, PageRasterizer, RasterizerOptions};
 pub use settings::{DefaultZoomPolicy, PageLayoutMode, PdfViewerSettings};