feat(sidebar): drop the fold arrows from headers and groups

The chevron beside every section and group was saying "clickable" a
second time next to an icon and a bold name that already said it. Gone
now: a system section folds from anywhere on its heading, and a group
folds from its folder icon while the name still opens the group's page.
No arrow on the rail.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/e2e/smoke.spec.js

@@ -371,9 +371,9 @@ test('en projektgruppe kan foldes, fyldes og slettes uden at tage projekterne me
 	await sidebar.getByLabel('Gruppens navn').fill('Arbejde');
 	await sidebar.getByLabel('Gruppens navn').press('Enter');
 
-	// The name is a link to the group's own page; the chevron beside it is a
+	// The name is a link to the group's own page; the folder icon beside it is a
 	// separate button that folds. Two intentions, two targets — the single one they
-	// used to share could only ever serve the smaller.
+	// used to share could only ever serve the smaller, and neither wears an arrow.
 	//
 	// `exact` on the link, because a group's name is a user-chosen word that can
 	// turn up inside another control's name, and Playwright matches an accessible
@@ -389,13 +389,14 @@ test('en projektgruppe kan foldes, fyldes og slettes uden at tage projekterne me
 	// The clipping half is here because it was once broken: "Omdøb" and "Slet" sat
 	// in the flow reserving their width even while invisible, so ARBEJDE was drawn
 	// as "ARBE". The alignment half changed meaning with the redesign: a group now
-	// carries a fold chevron and a section icon just like "Projekter" above it, and
+	// carries a section icon just like "Projekter" above it, and belongs to that
-	// belongs to that heading tier rather than to the project rows below.
+	// heading tier rather than to the project rows below.
 	const shape = await sidebar.locator('.folder-head').evaluate((el) => {
 		const link = el.querySelector('h2 a');
-		// The leading mark is now the section icon, the same folder/funnel/tag glyph
+		// The leading mark is the section icon in its own fold button, the same
-		// the system headings carry — a group and a section read identically.
+		// folder/funnel/tag glyph the system headings carry — a group and a section
-		const name = { ...link.querySelector('.head-icon').getBoundingClientRect().toJSON() };
+		// read identically, and the icon sits before the name, not inside the link.
+		const name = { ...el.querySelector('.head-icon').getBoundingClientRect().toJSON() };
 		return {
 			clipped: link.scrollWidth > link.clientWidth + 1,
 			left: name.left,
@@ -408,7 +409,7 @@ test('en projektgruppe kan foldes, fyldes og slettes uden at tage projekterne me
 	expect(shape.count, 'navnet og tallet overlapper').toBeGreaterThanOrEqual(shape.right);
 
 	// A group is a heading, not a project row: it belongs to the same tier as
-	// "Projekter" and the other system sections — chevron, icon, bold name — and
+	// "Projekter" and the other system sections — icon, bold name, no arrow — and
 	// starts where they start, not where the projects filed under it do. Measured
 	// icon to icon, the one mark both headings share.
 	const sectionLeft = await sidebar
@@ -440,13 +441,13 @@ test('en projektgruppe kan foldes, fyldes og slettes uden at tage projekterne me
 		'false'
 	);
 
-	// A group's chevron is in the flow now, the same one the system sections carry —
+	// The fold control is the bare folder icon now — no chevron, and no --surface
-	// no absolute mark with a --surface field behind it, so a folded group no longer
+	// field behind it, so a folded group leaves no pale square beside its name on
-	// leaves a pale square beside its name on the sunken bar.
+	// the sunken bar.
-	const chevronBg = await sidebar
+	const foldBg = await sidebar
-		.locator('.folder-head .chevron-button')
+		.locator('.folder-head .fold-icon')
 		.evaluate((el) => getComputedStyle(el).backgroundColor);
-	expect(chevronBg, 'chevronen har en firkant bag sig').toBe('rgba(0, 0, 0, 0)');
+	expect(foldBg, 'foldeknappen har en firkant bag sig').toBe('rgba(0, 0, 0, 0)');
 
 	await sidebar.getByRole('button', { name: /^Fold Arbejde/ }).click();
 

web/src/lib/components/Sidebar.svelte

@@ -682,13 +682,14 @@
 	<!--
 		A fixed heading that folds, the same way a project group's does.
 
-		One snippet for all four rather than four copies of a chevron and an aria
+		One snippet for all four rather than four copies of an icon and an aria
 		attribute: they have to behave identically, and the group heading is already
 		the proof that they drift otherwise — it grew a fold, a colour and two
 		actions while these stayed plain text.
 
-		The whole heading is the target, not the chevron. At this size a lone chevron
+		The whole heading is the target, and the icon is the mark: no arrow beside it.
-		is something you miss, and the name is where the eye already is.
+		At this size an extra glyph is clutter, and the name is where the eye already
+		is.
 	-->
 	<!-- One monochrome mark per kind of heading, so a section and a group read as the
 	     same kind of thing — a folder of projects, a funnel of filters, a tag of
@@ -749,19 +750,15 @@
 	{/snippet}
 
 	{#snippet foldHeading(key, label)}
+		<!-- No chevron: a system section has no page and nothing to rename, so the
+		     whole heading is one button that folds it. The icon and the bold name are
+		     the whole control — an arrow beside them was only ever saying "clickable"
+		     twice. -->
 		<h2 class="fold">
 			<button
 				onclick={() => app.toggleSection(key)}
 				aria-expanded={!app.sectionCollapsed(key)}
 			>
-				<svg
-					class="chevron"
-					class:collapsed={app.sectionCollapsed(key)}
-					viewBox="0 0 24 24"
-					aria-hidden="true"
-				>
-					<path d="M6 9l6 6 6-6" />
-				</svg>
 				{@render sectionIcon(key)}
 				{label}
 			</button>
@@ -930,31 +927,22 @@
 							</div>
 						</form>
 					{:else}
-						<!-- The button sits inside the heading, not around it, the same way a
+						<!-- No chevron: the folder icon itself folds the group, and the name
-						     project's title does: a group *is* a heading in the sidebar, and
+						     beside it opens the group's own page. Two intentions, two targets,
-						     wrapping an h2 in a button both invalidates the markup and takes
+						     but no arrow to clutter the rail — the icon a section carries is
-						     the heading away from a screen reader. The whole heading folds —
+						     the same one that folds it here. The button sits inside the
-						     at this size a lone chevron is a target you miss, and the name is
+						     heading, not around it: a group *is* a heading, and wrapping an h2
-						     where the eye already is. -->
+						     in a button both invalidates the markup and takes the heading from
-						<!-- The chevron folds; the name opens the group's own page. Two
+						     a screen reader. -->
-						     targets in one heading, because they are two different intentions
-						     and the old single one could only ever serve the smaller. -->
 						<button
-							class="chevron-button"
+							class="fold-icon"
 							onclick={() => app.toggleGroup(group.id)}
 							aria-expanded={!group.collapsed}
 							aria-label={group.collapsed
 								? t('sidebar.unfold', { name: group.name })
 								: t('sidebar.fold', { name: group.name })}
 						>
-							<svg
+							{@render sectionIcon('group')}
-								class="chevron"
-								class:collapsed={group.collapsed}
-								viewBox="0 0 24 24"
-								aria-hidden="true"
-							>
-								<path d="M6 9l6 6 6-6" />
-							</svg>
 						</button>
 						<h2 class="fold">
 							<!-- Navigation waits two tenths of a second for a second click. A
@@ -975,7 +963,6 @@
 									}, 200);
 								}}
 							>
-								{@render sectionIcon('group')}
 								{group.name}
 							</a>
 						</h2>
@@ -1425,35 +1412,17 @@
 		min-width: 0;
 	}
 
-	/* The chevron on its own, so the name beside it can be a link to the group's
+	/* The folder icon is the fold toggle now — no chevron beside it. A bare icon
-	   page. Sized as a target rather than as a glyph: 11px of arrow is something
+	   button the size of the icon it holds: the name next to it opens the group's
-	   you miss. */
+	   page, this folds it, and neither wears an arrow to say so. */
-	/* The chevron sits on top of the group's dot rather than before it. In the flow
+	.fold-icon {
-	   it pushed the name 22px further in than a project's, so groups read as if
-	   they were filed under the projects above them — the opposite of what they
-	   are. Out of the flow, a group's name starts exactly where a project's does.
-	   The dot is the resting state; the chevron takes over on hover or focus, and
-	   stays put while the group is folded, so a folded group still shows the way
-	   back open. */
-	/* Uden baggrund. Knappen dækkede prikken med et felt i --surface, og på den
-	   sænkede bjælke er det en lys firkant: en foldet gruppe stod med en hvid
-	   klods ud for navnet permanent, fordi chevronen bliver stående, når gruppen
-	   er lukket. Prikken tones ud i stedet for at blive dækket — det er samme
-	   skifte, uden noget at male henover den med. */
-	/* A group folds from its own chevron, the same one the system sections carry —
-	   in the flow before the name now, not an absolute mark that appeared on hover,
-	   so a group and a section read identically at rest. The name beside it is still
-	   a link to the group's page; the chevron is the second intention. */
-	.chevron-button {
 		flex: none;
-		width: 14px;
-		height: 14px;
 		display: grid;
 		place-items: center;
 		color: inherit;
 	}
 
-	.chevron-button:hover {
+	.fold-icon:hover {
 		color: var(--ink);
 	}
 
@@ -1482,22 +1451,6 @@
 		text-decoration: none;
 	}
 
-	.chevron {
-		width: 11px;
-		height: 11px;
-		flex: none;
-		fill: none;
-		stroke: currentColor;
-		stroke-width: 2.4;
-		stroke-linecap: round;
-		stroke-linejoin: round;
-		transition: transform var(--fast) var(--ease);
-	}
-
-	.chevron.collapsed {
-		transform: rotate(-90deg);
-	}
-
 	/* Hidden until the heading is hovered, like the section actions on a project
 	   page: two buttons permanently beside a label stop it reading as a label. */
 	.folder-head .count {