Fix setup panel emoji and double-encoded UTF-8 (mojibake)

- SetupCommand: ':black_square_for_button:' is not a valid Discord
  shortcode, so unconfigured modules rendered as raw text. Use
  ':black_square_button:' (lines 154, 160).
- Fix double-encoded UTF-8 in 5 files where original chars were
  UTF-8 encoded, mis-decoded as Windows-1252, then re-saved as UTF-8:
    SetupCommand:600      ->  ? ? ?
    UpdateChecker:139     ->  em-dash
    StartupBanner:21,55   ->  em-dash (guild name / truncate fallback)
    PlayerProfileBuilder  ->  middle dot, bullet
    LeaderboardModule     ->  em-dash (x2)

Compiles cleanly (mvn compile). Zero residual mojibake in src/.

Author: Cyrusbye720

src/main/java/dev/demonz/zdiscord/discord/SetupCommand.java

@@ -151,13 +151,13 @@ private void showWizardPanel(SlashCommandInteractionEvent event) {
                 statusLines.append(":white_check_mark: **").append(entry.getKey())
                         .append("** -> <#").append(val).append(">\n");
             } else {
-                statusLines.append(":black_square_for_button: ").append(entry.getKey()).append("\n");
+                statusLines.append(":black_square_button: ").append(entry.getKey()).append("\n");
             }
         }
 
         int catCount = getCategoriesFromConfig().size();
         String catLine = catCount == 0
-                ? ":black_square_for_button: ticket categories (none yet)"
+                ? ":black_square_button: ticket categories (none yet)"
                 : ":white_check_mark: " + catCount + " ticket categor"
                         + (catCount == 1 ? "y" : "ies") + " configured";
 
@@ -597,7 +597,7 @@ private void showCategoryModal(ButtonInteractionEvent event, String existingId)
         modal.addActionRow(TextInput.create("emoji", "Emoji (optional)",
                 TextInputStyle.SHORT)
                 .setValue(existing == null || existing.emoji == null ? "" : existing.emoji)
-                .setPlaceholder("❓  ⚡  🐛  (single emoji)")
+                .setPlaceholder("❓  ⚡  🐛  (single emoji)")
                 .setRequired(false)
                 .setMaxLength(8)
                 .build());

src/main/java/dev/demonz/zdiscord/modules/LeaderboardModule.java

@@ -342,7 +342,7 @@ public EmbedBuilder buildLeaderboardEmbed(String stat, int page,
             String value = formatStatValue(key, entry.getValue());
 
             sb.append(rank).append(" **").append(playerName).append("**")
-                    .append("  —  `").append(value).append("`\n")
+                    .append("  —  `").append(value).append("`\n")
                     .append("\u200B \u200B \u200B \u200B ").append(bar).append("\n");
         }
 
@@ -437,7 +437,7 @@ public EmbedBuilder buildFollowerLeaderboardEmbed() {
             String rank = i < 3 ? MEDALS[i] : "**" + (i + 1) + ".**";
             String bar = buildProgressBar(entry.getValue(), maxVal);
             sb.append(rank).append(" **").append(name).append("**")
-                    .append("  —  `").append(entry.getValue()).append(" followers`\n")
+                    .append("  —  `").append(entry.getValue()).append(" followers`\n")
                     .append("\u200B \u200B \u200B \u200B ").append(bar).append("\n");
         }
         embed.setDescription(sb.toString());

src/main/java/dev/demonz/zdiscord/util/PlayerProfileBuilder.java

@@ -54,13 +54,13 @@ public static EmbedBuilder toEmbed(ZDiscord plugin, Profile profile, String requ
                 "profile.embed.color", "#9B59B6");
 
         EmbedBuilder embed = new EmbedBuilder()
-                .setAuthor(profile.name + "  ·  Player profile",
+                .setAuthor(profile.name + "  ·  Player profile",
                         "https://namemc.com/profile/" + profile.uuid,
                         avatarSmall)
                 .setThumbnail(avatarLarge)
                 .setColor(ColorUtil.parseHex(color))
                 .setFooter("Requested by " + requestedBy
-                        + "  •  ZDiscord v" + plugin.getDescription().getVersion(), null)
+                        + "  •  ZDiscord v" + plugin.getDescription().getVersion(), null)
                 .setTimestamp(Instant.now());
 
 

src/main/java/dev/demonz/zdiscord/util/StartupBanner.java

@@ -18,7 +18,7 @@ public static void print(ZDiscord plugin, long startupMs) {
         String platform = plugin.getPlatformAdapter().getPlatformName();
 
         String botName = "Not connected";
-        String guildName = "—";
+        String guildName = "—";
         if (plugin.getBotManager() != null && plugin.getBotManager().isConnected()) {
             botName = plugin.getBotManager().getJda().getSelfUser().getName();
             var guild = plugin.getBotManager().getGuild();
@@ -52,7 +52,7 @@ private static String pad(String text) {
 
     private static String truncate(String text, int maxLen) {
         if (text == null) {
-            return "—";
+            return "—";
         }
         if (text.length() <= maxLen) {
             return text;

src/main/java/dev/demonz/zdiscord/util/UpdateChecker.java

@@ -136,7 +136,7 @@ private void postSilentDiscordNotice(String currentVersion) {
         EmbedBuilder embed = new EmbedBuilder()
                 .setTitle(":arrows_counterclockwise: ZDiscord update available")
                 .setDescription("A new version of **ZDiscord** is available. "
-                        + "No action is required — this is a quiet notice.\n\n"
+                        + "No action is required — this is a quiet notice.\n\n"
                         + "Installed: `v" + currentVersion + "`\n"
                         + "Latest: `v" + latestVersion + "`")
                 .setColor(0xF1C40F)