chore: housekeeping — linter & formatter setup

Add .prettierrc.json, .markdownlint.json, .yamllint.yaml, .gitattributes
Run CSharpier, Prettier and markdownlint across the entire codebase.
No logic changes — formatting, using order and line endings only.

HellionChat/Ipc/TypingIpc.cs

@@ -1,9 +1,16 @@
-using HellionChat.Code;
 using Dalamud.Plugin.Ipc;
+using HellionChat.Code;
 
 namespace HellionChat.Ipc;
 
-using ChatInputState = (bool InputVisible, bool InputFocused, bool HasText, bool IsTyping, int TextLength, ChatType ChannelType);
+using ChatInputState = (
+    bool InputVisible,
+    bool InputFocused,
+    bool HasText,
+    bool IsTyping,
+    int TextLength,
+    ChatType ChannelType
+);
 
 internal sealed class TypingIpc : IDisposable
 {
@@ -19,8 +26,12 @@ internal sealed class TypingIpc : IDisposable
     {
         Plugin = plugin;
 
-        StateQueryGate = Plugin.Interface.GetIpcProvider<ChatInputState>("HellionChat.GetChatInputState");
-        StateChangedGate = Plugin.Interface.GetIpcProvider<ChatInputState, object?>("HellionChat.ChatInputStateChanged");
+        StateQueryGate = Plugin.Interface.GetIpcProvider<ChatInputState>(
+            "HellionChat.GetChatInputState"
+        );
+        StateChangedGate = Plugin.Interface.GetIpcProvider<ChatInputState, object?>(
+            "HellionChat.ChatInputStateChanged"
+        );
 
         StateQueryGate.RegisterFunc(GetState);
     }
@@ -30,19 +41,22 @@ internal sealed class TypingIpc : IDisposable
         var log = Plugin.ChatLogWindow;
 
         var usedChannel = Plugin.CurrentTab.CurrentChannel;
-        var inputChannel = usedChannel.UseTempChannel ? usedChannel.TempChannel : usedChannel.Channel;
+        var inputChannel = usedChannel.UseTempChannel
+            ? usedChannel.TempChannel
+            : usedChannel.Channel;
         var channelType = inputChannel.ToChatType();
 
-        return (InputVisible: !log.IsHidden,
+        return (
+            InputVisible: !log.IsHidden,
             log.InputFocused,
             HasText: log.Chat.Length > 0,
             IsTyping: log is { InputFocused: true, Chat.Length: > 0 },
             TextLength: log.Chat.Length,
-            ChannelType: channelType);
+            ChannelType: channelType
+        );
     }
 
-    private ChatInputState GetState()
-        => BuildState();
+    private ChatInputState GetState() => BuildState();
 
     internal void Update()
     {