Remove comments from backend and web-player source

Strip //, /* */ and XML doc comments from all backend .cs files, and
JS/TS/CSS/HTML comments from web-player source (.ts, .svelte, .css),
per the project's no-comments convention.

web-player/src/lib/server/greeting.ts

@@ -88,10 +88,6 @@ export interface Birthday {
 	day: number;
 }
 
-/**
- * `birthday` is optional because the user's date of birth isn't part of the
- * session/profile data yet. Wire it up here once that field exists upstream.
- */
 export function pickGreeting(date: Date, birthday?: Birthday | null): string {
 	const month = date.getMonth() + 1;
 	const day = date.getDate();

web-player/src/lib/server/playbackConfig.ts

@@ -15,8 +15,6 @@ export async function getAllowAnonymousListening(fetchFn: typeof fetch): Promise
 		cached = { allowAnonymousListening, expiresAt: Date.now() + CACHE_TTL_MS };
 		return allowAnonymousListening;
 	} catch {
-		// The API being unreachable shouldn't take down every page in the app;
-		// fail closed (as if anonymous listening were off) and retry next time.
 		return false;
 	}
 }