feat(web): board and calendar views, saved filters and label pages

The board is one column per section with native drag-and-drop, which
works with a trackpad, a mouse and a screen reader without any of them
being reimplemented. Dropping is optimistic: a card that snaps back for
200ms reads as a failed drop.

Weeks in the calendar start on Monday. That is ISO 8601 and what every
Danish calendar does; a Sunday-first grid makes a Dane misread the month
at a glance. On a phone the chips give way to coloured bars — at that
width the month's shape is the useful part, not the titles.

Label pages run the filter language rather than a bespoke endpoint, so a
label page and a saved filter can never disagree about what a label
selects.

fix(recurrence): "hver mandag", not "hver uge mandag"

A weekly rule that names its days does not also need the word for the
interval. That is how the phrase is said, and it is what the parser
accepts back — the round trip through Describe now holds for weekday
rules too.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

web/src/lib/components/TaskRow.svelte

@@ -79,13 +79,24 @@
 			<span class="description">{task.description}</span>
 		{/if}
 
-		{#if due || task.labels?.length}
+		{#if due || task.labels?.length || task.recurrence_text}
 			<span class="meta">
 				{#if due}
 					<span class="due" data-tone={due.tone}>
 						{due.text}{#if time}&nbsp;{time}{/if}
 					</span>
 				{/if}
+				{#if task.recurrence_text}
+					<span class="repeat" title="Gentages {task.recurrence_text}">
+						<svg viewBox="0 0 24 24" aria-hidden="true">
+							<path d="M17 2l4 4-4 4" />
+							<path d="M3 11V9a4 4 0 014-4h14" />
+							<path d="M7 22l-4-4 4-4" />
+							<path d="M21 13v2a4 4 0 01-4 4H3" />
+						</svg>
+						{task.recurrence_text}
+					</span>
+				{/if}
 				{#each task.labels ?? [] as label}
 					<span class="label">{label}</span>
 				{/each}
@@ -229,6 +240,23 @@
 		color: var(--ink-muted);
 	}
 
+	.repeat {
+		display: inline-flex;
+		align-items: center;
+		gap: 3px;
+		color: var(--ink-muted);
+	}
+
+	.repeat svg {
+		width: 11px;
+		height: 11px;
+		fill: none;
+		stroke: currentColor;
+		stroke-width: 2;
+		stroke-linecap: round;
+		stroke-linejoin: round;
+	}
+
 	.label {
 		color: var(--ink-muted);
 		background: var(--surface-raised);