feat(theme): animate public background with aurora and particles, polish landing pages

Add background_effect (aurora/particles), background_overlay tint and
opacity to the theme manager, rendered site-wide by ThemeVars on every
public page. Polish the home and register pages (hero mascot, live stat
pulse, date pills, photo strip, CTA band, theme-aware register intro,
i18n for home/register section).

src/messages/en.json

@@ -288,7 +288,11 @@
 			"sectionStatsLabel": "Live stats",
 			"sectionStatsTitle": "A community that keeps growing",
 			"sectionCommunityLabel": "Community",
-			"sectionCommunityTitle": "Make yourself at home"
+			"sectionCommunityTitle": "Make yourself at home",
+			"joinCtaTitle": "Ready to make yourself at home?",
+			"joinCtaBody": "Create your avatar, grab some furni and meet new friends — your hotel adventure starts here.",
+			"ctaJoin": "Join the hotel",
+			"browseCommunity": "Browse the community"
 		},
 		"news": {
 			"title": "News",
@@ -997,6 +1001,7 @@
 			"alreadyHaveAccountLink": "Sign in",
 			"register": "Register",
 			"whoIsOnline": "Who's online",
+			"newestCitizens": "Newest citizens",
 			"usersOnline": "{count} online",
 			"termsError": "You must accept the terms & rules to register.",
 			"usernameError": "Username is required.",
@@ -4810,6 +4815,15 @@
 							"applyBackground": "Apply background",
 							"uploadButton": "Upload image…",
 							"clearBackground": "Remove background",
+							"backgroundEffectLabel": "Effect",
+							"backgroundEffectHint": "Animate the public background with a gentle, theme-matched layer (aurora uses your primary/accent colors).",
+							"backgroundEffect_none": "None (plain background)",
+							"backgroundEffect_aurora": "Aurora glow",
+							"backgroundEffect_particles": "Floating particles",
+							"backgroundEffect_aurora-particles": "Aurora + particles",
+							"backgroundEffectPreview": "Effect: {effect} — shown behind the public site.",
+							"backgroundOverlayLabel": "Overlay tint",
+							"backgroundOverlayOpacityLabel": "Overlay strength",
 							"notice": {
 								"saved": "Theme saved.",
 								"applied": "Theme applied.",

src/messages/it.json

@@ -283,12 +283,16 @@
 			"featuresCommunityDesc": "Fai amicizia e chatta",
 			"featuresGames": "Giochi",
 			"featuresGamesDesc": "Competi e divertiti",
-			"sectionFeaturesLabel": "Features",
-			"sectionFeaturesTitle": "Everything a great hotel needs",
-			"sectionStatsLabel": "Live stats",
-			"sectionStatsTitle": "A community that keeps growing",
+			"sectionFeaturesLabel": "Funzionalità",
+			"sectionFeaturesTitle": "Tutto ciò che un grande hotel merita",
+			"sectionStatsLabel": "Statistiche live",
+			"sectionStatsTitle": "Una community che continua a crescere",
 			"sectionCommunityLabel": "Community",
-			"sectionCommunityTitle": "Make yourself at home"
+			"sectionCommunityTitle": "Fatti sentire a casa",
+			"joinCtaTitle": "Pronto a sentirti a casa?",
+			"joinCtaBody": "Crea il tuo avatar, prendi dei mobili e incontra nuovi amici: la tua avventura nell'hotel inizia qui.",
+			"ctaJoin": "Entra nell'hotel",
+			"browseCommunity": "Scopri la community"
 		},
 		"news": {
 			"title": "Notizie",
@@ -976,6 +980,7 @@
 			"alreadyHaveAccountPre": "Hai già un account?",
 			"alreadyHaveAccountLink": "Accedi",
 			"whoIsOnline": "Chi è online",
+			"newestCitizens": "Nuovi cittadini",
 			"usersOnline": "{count} online",
 			"accepted": "Accettato e confermato",
 			"showPassword": "Mostra",
@@ -4809,6 +4814,15 @@
 							"applyBackground": "Applica sfondo",
 							"uploadButton": "Carica immagine…",
 							"clearBackground": "Rimuovi sfondo",
+							"backgroundEffectLabel": "Effetto",
+							"backgroundEffectHint": "Anima lo sfondo pubblico con un livello delicato e abbinato al tema (l'aurora usa i colori primario/accento).",
+							"backgroundEffect_none": "Nessuno (sfondo semplice)",
+							"backgroundEffect_aurora": "Bagliore aurora",
+							"backgroundEffect_particles": "Particelle fluttuanti",
+							"backgroundEffect_aurora-particles": "Aurora + particelle",
+							"backgroundEffectPreview": "Effetto: {effect} — mostrato dietro il sito pubblico.",
+							"backgroundOverlayLabel": "Tinta di sovrapposizione",
+							"backgroundOverlayOpacityLabel": "Intensità tinta",
 							"notice": {
 								"saved": "Tema salvato.",
 								"applied": "Tema applicato.",