feat: recent files type filter + calendar middle-click + calendar spacing

Recent files:
- Type filter bar with pill tags above the list
- Scans frontmatter 'type' property of each recent file
- Click a pill to filter, click again or 'all' to clear
- Active pill shows accent color

Calendar:
- Middle-click on day/week/quarter/month/year opens in new tab
- openPeriodNoteInLeaf() method for leaf-targeted opening
- More spacing: taller day cells, more padding, wider margins

Bookmarks:
- Right-click on recent file → 'Add to bookmarks' option

styles.css

@@ -189,6 +189,34 @@
 }
 /* ── Recent Files ── */
 
+.waypoint-recent-filter {
+	display: flex;
+	flex-wrap: wrap;
+	gap: 4px;
+	margin-bottom: 6px;
+}
+
+.waypoint-recent-pill {
+	font-size: var(--font-ui-smaller);
+	color: var(--text-muted);
+	background: var(--background-modifier-hover);
+	padding: 1px 6px;
+	border-radius: 10px;
+	cursor: var(--cursor);
+	transition: color 80ms, background 80ms;
+	user-select: none;
+}
+
+.waypoint-recent-pill:hover {
+	color: var(--text-normal);
+	background: var(--background-modifier-active-hover);
+}
+
+.waypoint-recent-pill.is-active {
+	color: var(--text-on-accent);
+	background: var(--interactive-accent);
+}
+
 .waypoint-recent-files .nav-file {
 	padding: 2px 0;
 }