feat(hikes): inline cantonal Wappen next to region label

26 public-domain coats of arms fetched once from Wikimedia Commons
via scripts/download-cantons.ts and committed under static/cantons/.
$lib/data/cantons.ts maps Swisstopo's free-form name (German default,
French/Italian alternates for Romandie / Ticino) to the ISO code +
emblem URL.

Card shows an 18×22 emblem, detail page a 24×30 one — both with a
drop-shadow so they read against the dark hero gradient. Unknown
canton names fall back to plain text without the emblem.

The downloaded SVGs are written verbatim — earlier draft prepended a
provenance HTML comment but that breaks the leading `<?xml … ?>` and
browsers refuse to render the image. Provenance lives in the script's
CANTONS table instead.

src/lib/data/cantons.ts

@@ -0,0 +1,86 @@
+/**
+ * Swiss-canton lookup. `resolveCanton(name)` takes whatever the Swisstopo
+ * reverse-geocode returns (German is the default, but French/Italian names
+ * surface for Romandie / Ticino hikes) and resolves it to a stable record
+ * carrying the ISO code, a short label for tooltips, and the URL of the
+ * pre-downloaded coat-of-arms SVG.
+ *
+ * The 26 SVGs live in `static/cantons/<iso-code>.svg` — fetched once by
+ * `scripts/download-cantons.ts` and committed.
+ */
+
+export type Canton = {
+	/** ISO 3166-2:CH code, lowercase (e.g. 'ar'). */
+	code: string;
+	/** Canonical German name (matches the `static/cantons/` filename map). */
+	name: string;
+	/** Short label used in tooltips / compact UIs. */
+	abbr: string;
+	/** Absolute URL of the coat-of-arms SVG. */
+	emblemUrl: string;
+};
+
+// Tuple format keeps the file compact: [code, German name, short abbr, ...alternate names].
+// Alternates cover French/Italian renderings that Swisstopo occasionally returns
+// for cantons with multiple official languages, plus the few historic spellings.
+const CANTON_TABLE: ReadonlyArray<readonly [string, string, string, ...string[]]> = [
+	['ag', 'Aargau', 'AG'],
+	['ai', 'Appenzell Innerrhoden', 'AI'],
+	['ar', 'Appenzell Ausserrhoden', 'AR'],
+	['be', 'Bern', 'BE', 'Berne'],
+	['bl', 'Basel-Landschaft', 'BL', 'Bâle-Campagne'],
+	['bs', 'Basel-Stadt', 'BS', 'Bâle-Ville'],
+	['fr', 'Freiburg', 'FR', 'Fribourg'],
+	['ge', 'Genf', 'GE', 'Genève', 'Geneva'],
+	['gl', 'Glarus', 'GL'],
+	['gr', 'Graubünden', 'GR', 'Grigioni', 'Grischun', 'Grisons'],
+	['ju', 'Jura', 'JU'],
+	['lu', 'Luzern', 'LU', 'Lucerne'],
+	['ne', 'Neuenburg', 'NE', 'Neuchâtel'],
+	['nw', 'Nidwalden', 'NW'],
+	['ow', 'Obwalden', 'OW'],
+	['sg', 'St. Gallen', 'SG', 'Sankt Gallen', 'Saint-Gall', 'San Gallo'],
+	['sh', 'Schaffhausen', 'SH', 'Schaffhouse'],
+	['so', 'Solothurn', 'SO', 'Soleure'],
+	['sz', 'Schwyz', 'SZ'],
+	['tg', 'Thurgau', 'TG', 'Thurgovie'],
+	['ti', 'Tessin', 'TI', 'Ticino'],
+	['ur', 'Uri', 'UR'],
+	['vd', 'Waadt', 'VD', 'Vaud'],
+	['vs', 'Wallis', 'VS', 'Valais', 'Vallese'],
+	['zg', 'Zug', 'ZG', 'Zoug'],
+	['zh', 'Zürich', 'ZH', 'Zurich', 'Zurigo']
+];
+
+// Normalise for lookup: strip accents, lowercase, collapse whitespace.
+// Lets "St. Gallen" / "Sankt Gallen" / "saint-gall" all match the same entry.
+function normalise(s: string): string {
+	return s
+		.normalize('NFD')
+		.replace(/[̀-ͯ]/g, '')
+		.replace(/[^a-z0-9]+/gi, ' ')
+		.trim()
+		.toLowerCase();
+}
+
+const BY_NAME = new Map<string, Canton>();
+for (const [code, name, abbr, ...alts] of CANTON_TABLE) {
+	const canton: Canton = {
+		code,
+		name,
+		abbr,
+		emblemUrl: `/cantons/${code}.svg`
+	};
+	BY_NAME.set(normalise(name), canton);
+	for (const alt of alts) BY_NAME.set(normalise(alt), canton);
+	// Also accept the ISO code itself (`'AR'`, `'ar'`).
+	BY_NAME.set(normalise(code), canton);
+}
+
+/** Resolve a free-form canton name (any official language) to a Canton
+ * record. Returns null if the name doesn't match a known canton — caller
+ * should fall back to plain text without the emblem. */
+export function resolveCanton(name: string | null | undefined): Canton | null {
+	if (!name) return null;
+	return BY_NAME.get(normalise(name)) ?? null;
+}