adding added ad slot support for adddss

server/src/services/sessionService/constants.js

@@ -9,6 +9,20 @@ const discordInvite = config.discord?.invite || null;
 const kofiLink = config.kofi?.link || null;
 const serverTimezone = config.timezone || null;
 const configuredSocials = getConfiguredSocials(config);
+/*
+  The driver ad is trusted deployment content supplied by the server operator.
+  Normalize both values at the server boundary so every browser receives a
+  predictable string-only contract, even when the YAML keys are absent or were
+  accidentally configured with another scalar type.
+
+  Keep the title and markup together because they describe one optional card.
+  An empty HTML string disables the card; the title alone must never leave an
+  empty panel at the bottom of the driver layout.
+*/
+const driverAd = {
+  title: typeof config.driverAd?.title === 'string' ? config.driverAd.title.trim() : '',
+  html: typeof config.driverAd?.html === 'string' ? config.driverAd.html.trim() : '',
+};
 
 const ACTIVITY_SYNC_COOLDOWN_MS = 3000;
 const GPIO_TOGGLE_SYNC_COOLDOWN_MS = 1000;
@@ -19,6 +33,7 @@ module.exports = {
   kofiLink,
   serverTimezone,
   configuredSocials,
+  driverAd,
   ACTIVITY_SYNC_COOLDOWN_MS,
   GPIO_TOGGLE_SYNC_COOLDOWN_MS,
   PERIODIC_SYNC_MS,

server/src/services/sessionService/index.js

@@ -61,6 +61,7 @@ const {
   kofiLink,
   serverTimezone,
   configuredSocials,
+  driverAd,
   ACTIVITY_SYNC_COOLDOWN_MS,
   GPIO_TOGGLE_SYNC_COOLDOWN_MS,
   PERIODIC_SYNC_MS,
@@ -209,6 +210,13 @@ function buildSession(socket) {
     adminReason: getAdminReason(),
     users,
     socials,
+    /*
+      This is intentionally raw, operator-authored HTML. The browser only
+      mounts it on the desktop driver page, but keeping it in the ordinary
+      session payload makes the server configuration the single source of
+      truth and avoids a separate endpoint for one small optional card.
+    */
+    driverAd,
     discord: {
       invite: discordInvite,
     },