fix(7tv): guard channel avatar URL to prevent includes on undefined (#47)

* Fix cross-platform icon compatibility

- Add cross-platform icon handling for Linux/macOS support
- Convert Windows .ico to .png for non-Windows platforms
- Update tray and thumbar icons to use platform-appropriate format

Fixes application crashes on Linux due to unsupported .ico format

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* fix(7tv): null-guard channel avatar in EmoteDialogs to prevent includes on undefined. Fixes #46

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: BP602

src/renderer/src/components/Chat/Input/EmoteDialogs.jsx

@@ -114,6 +114,16 @@ const SevenTVEmoteDialog = memo(
         .filter((section) => section.emotes && section.emotes.length > 0);
     }, [sevenTVEmotes, searchTerm]);
 
+    // Compute a safe avatar URL for the channel section (if present)
+    const channelSet = useMemo(() => sevenTVEmotes?.find((set) => set.type === "channel"), [sevenTVEmotes]);
+    const channelAvatar = channelSet?.user?.avatar_url;
+    const channelAvatarSrc = useMemo(() => {
+      if (!channelAvatar) return STVLogo; // fallback to 7TV logo if missing
+      // If it's a full URL or Twitch CDN URL, use as-is; otherwise, prefix https:
+      if (channelAvatar.startsWith("http") || channelAvatar.includes("static-cdn.jtvnw.net")) return channelAvatar;
+      return `https:${channelAvatar}`;
+    }, [channelAvatar]);
+
     return (
       <>
         {isDialogOpen && (
@@ -142,12 +152,7 @@ const SevenTVEmoteDialog = memo(
                   <button
                     className={clsx("dialogHeadMenuItem", currentSection === "channel" && "active")}
                     onClick={() => setCurrentSection(currentSection === "channel" ? null : "channel")}>
-                    <img
-                      src={`${sevenTVEmotes?.find((set) => set.type === "channel")?.user?.avatar_url.includes("static-cdn.jtvnw.net") ? sevenTVEmotes?.find((set) => set.type === "channel")?.user?.avatar_url : `https:${sevenTVEmotes?.find((set) => set.type === "channel")?.user?.avatar_url}`}`}
-                      height={24}
-                      width={24}
-                      alt="Channel Emotes"
-                    />
+                    <img src={channelAvatarSrc} height={24} width={24} alt="Channel Emotes" />
                   </button>
                 )}
                 {sevenTVEmotes?.find((set) => set.type === "global" && set?.emotes?.length > 0) && (