feat(settings): menu and body-text font size, and a bolder menu by default

The sidebar read as muted 13px; the menu items now use their own size at
medium weight so they carry at a glance (Todoist-ish). Both sizes are
choices under Settings → Appearance:

- Menu font size drives a dedicated --menu-size the sidebar uses.
- Body text size re-scales the shared type tokens (the list and the notes),
  the same mechanism a look uses.

The two are independent on purpose — one is a glance down a list of names,
the other a paragraph you read. Kept in localStorage like theme and look,
and applied in app.html before first paint so a chosen size does not flash
in and resize. Four steps each (Small/Default/Large/Largest); Default
carries no attribute so the base tokens stand.

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

web/src/lib/components/Sidebar.svelte

@@ -1441,7 +1441,10 @@
 		border-radius: var(--radius);
 		color: var(--ink-muted);
 		text-decoration: none;
-		font-size: var(--text-sm);
+		/* Its own size (Settings → Appearance) and medium weight, so the menu items
+		   carry more than the muted small text they used to and read at a glance. */
+		font-size: var(--menu-size);
+		font-weight: 500;
 		transition:
 			background var(--fast) var(--ease),
 			color var(--fast) var(--ease);
@@ -1455,7 +1458,7 @@
 	a.active {
 		background: var(--surface-raised);
 		color: var(--ink);
-		font-weight: 500;
+		font-weight: 600;
 	}
 
 	/* Only your own projects reorder. A shared one sits where its owner put it —

web/src/lib/locales/da.js

@@ -230,6 +230,14 @@ export const da = {
 		'Gemmes i denne browser. Det er en egenskab ved den skærm, du sidder ved — en bærbar i solen og en skærm i et mørkt rum vil have hvert sit svar.',
 	'account.look': 'Udseende',
 	'account.lookHint': 'Temaet siger hvor lyst. Det her siger hvordan det læses — skrift, luft og hjørner. De to kan kombineres frit.',
+	'account.sizes': 'Skriftstørrelse',
+	'account.sizesHint': 'Menuen og brødteksten kan sættes hver for sig — den ene er et blik ned over en liste, den anden en tekst, man læser.',
+	'account.menuSize': 'Menu',
+	'account.textSize': 'Brødtekst',
+	'size.small': 'Lille',
+	'size.default': 'Standard',
+	'size.large': 'Stor',
+	'size.xl': 'Størst',
 	'look.verdande': 'Verdande',
 	'look.verdandeNote': 'Som du kender den.',
 	'look.rolig': 'Rolig',

web/src/lib/locales/en.js

@@ -226,6 +226,14 @@ export const en = {
 		'Kept in this browser. It is a property of the screen you are sitting at — a laptop in the sun and a monitor in a dark room want different answers.',
 	'account.look': 'Appearance',
 	'account.lookHint': 'The theme says how bright. This says how it reads — typeface, air and corners. The two combine freely.',
+	'account.sizes': 'Text size',
+	'account.sizesHint': 'The menu and the body text set separately — one is a glance down a list, the other a paragraph you read.',
+	'account.menuSize': 'Menu',
+	'account.textSize': 'Body text',
+	'size.small': 'Small',
+	'size.default': 'Default',
+	'size.large': 'Large',
+	'size.xl': 'Largest',
 	'look.verdande': 'Verdande',
 	'look.verdandeNote': 'As you know it.',
 	'look.rolig': 'Calm',

web/src/lib/stores.svelte.js

@@ -1051,6 +1051,52 @@ class Look {
 
 export const look = new Look();
 
+/**
+ * The font-size steps, shared by the menu and the body-text controls. `default`
+ * carries no attribute, so the base tokens in app.css stand unchanged.
+ */
+export const SIZES = [
+	{ id: 'small', name: 'size.small' },
+	{ id: 'default', name: 'size.default' },
+	{ id: 'large', name: 'size.large' },
+	{ id: 'xl', name: 'size.xl' }
+];
+
+/**
+ * A font-size preference — the same shape as Look: kept in localStorage and
+ * mirrored onto <html>, where app.html sets it before first paint so a chosen size
+ * does not flash in at the default and resize. Two instances below, because the
+ * menu and the body text are separate questions.
+ */
+class Sizing {
+	current = $state('default');
+	#key;
+	#attr;
+
+	constructor(key, attr) {
+		this.#key = key;
+		this.#attr = attr;
+		if (typeof document !== 'undefined') {
+			this.current = document.documentElement.dataset[attr] ?? 'default';
+		}
+	}
+
+	set(id) {
+		if (!SIZES.some((s) => s.id === id)) return;
+		this.current = id;
+		if (id === 'default') delete document.documentElement.dataset[this.#attr];
+		else document.documentElement.dataset[this.#attr] = id;
+		try {
+			localStorage.setItem(this.#key, id);
+		} catch {
+			// Private browsing; the choice simply will not persist.
+		}
+	}
+}
+
+export const menuSize = new Sizing('verdande:menu-size', 'menuSize');
+export const textSize = new Sizing('verdande:text-size', 'textSize');
+
 /** Theme, kept in localStorage and applied to the document element. */
 class Theme {
 	/**