feat: add multi-token autocomplete for categories in FrontmatterEditorv1.4

Mirror the tags autocomplete behaviour for the categories field, loading
suggestions from docs/categories.txt via load_categories().

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 7 insertions, 1 deletions

diff --git a/ui/frontmatter_editor.py b/ui/frontmatter_editor.py
index add9a41..f1fe0df 100644
--- a/ui/frontmatter_editor.py
+++ b/ui/frontmatter_editor.py
@@ -8,7 +8,7 @@ from PyQt6.QtCore import Qt
 from pathlib import Path
 from core.models import Article, ARTICLE_TYPES
 from core.frontmatter import parse_frontmatter, write_frontmatter
-from core.taxonomy import load_taxonomy
+from core.taxonomy import load_taxonomy, load_categories
 
 class MultiTokenCompleter(QCompleter):
     """QCompleter that completes only the last comma-separated token."""
@@ -83,6 +83,12 @@ class FrontmatterEditor(QDialog):
                 widget = QLineEdit(", ".join(str(v) for v in val) if isinstance(val, list) else str(val))
                 MultiTokenCompleter(known_tags, widget).attach(widget)
                 self._fields[key] = widget
+            elif key == "categories":
+                cats_path = self._blog_root / "docs" / "categories.txt"
+                known_cats = load_categories(cats_path)
+                widget = QLineEdit(", ".join(str(v) for v in val) if isinstance(val, list) else str(val))
+                MultiTokenCompleter(known_cats, widget).attach(widget)
+                self._fields[key] = widget
             elif isinstance(val, list):
                 widget = QLineEdit(", ".join(str(v) for v in val))
                 self._fields[key] = widget