feat: configurable filter tags for recent files

New 'Filter tags' setting in Recent Files tab. Enter tag names one per line
to pin specific tags as filter pills. Leave empty to auto-detect from
frontmatter 'type' property (existing behavior).

manifest.json

@@ -1,7 +1,7 @@
 {
 	"id": "waypoint-sidebar",
 	"name": "Waypoint Sidebar",
-	"version": "1.4.1",
+	"version": "1.5.0",
 	"minAppVersion": "0.16.3",
 	"description": "Calendar, recent files, and custom bookmarks sidebar.",
 	"author": "Olivier",