admin: phosphor icons replace hand-drawn svgs and text-character glyphs

health strip marks, menu ticks, chip crosses, the search magnifier, the checkbox check and the back arrows all come from @phosphor-icons/react now, pinned exactly and entered in the license ledger. changelog and version bump for 0.0.15, including the bundle budget raise to 900000 bytes.

admin/src/features/activity/ActivityDetailPage.tsx

@@ -1,3 +1,4 @@
+import { ArrowLeft } from "@phosphor-icons/react";
 import { useQuery } from "@tanstack/react-query";
 import { Link, useParams, useSearch } from "@tanstack/react-router";
 import * as stylex from "@stylexjs/stylex";
@@ -12,11 +13,17 @@ import type { ActivitySearch } from "./search";
 
 const styles = stylex.create({
 	back: {
+		display: "inline-flex",
+		alignItems: "center",
+		gap: "0.25rem",
 		fontSize: "0.875rem",
 		lineHeight: "1.25rem",
 		color: colors.primaryOnSurface,
 		textDecorationLine: "none",
 	},
+	backIcon: {
+		display: "inline-flex",
+	},
 	loading: {
 		marginTop: "1rem",
 		color: colors.textMuted,
@@ -32,7 +39,10 @@ const styles = stylex.create({
 function BackLink({ origin }: { origin: ActivitySearch }) {
 	return (
 		<Link to="/activity" search={origin} {...stylex.props(styles.back, shared.focusRing)}>
-			← Activity
+			<span aria-hidden="true" {...stylex.props(styles.backIcon)}>
+				<ArrowLeft size={12} />
+			</span>
+			Activity
 		</Link>
 	);
 }