feat(chunk-renderer): add skeleton + per-ctor salt + player-hide helpers

Extracts v1.5.6's `ChatLogWindow.HidePlayerInString` / `HashPlayer` into
a standalone `Ui/Components/ChunkRenderer` class. C1 lands the skeleton
(ctor + DI-deps + salt + two pure helpers); C2 will add DrawChunks/DrawChunk
text-path; C3 will add DrawIcon + EmoteCache integration.

Salt is per-ctor random matching v1.5.6 session-random behavior — hashed
player names change every plugin reload to avoid stable cross-session
linkage (Spec §6.5 decision).

GameFunctions injected via ctor (not static Plugin.Functions) because
Plugin.Functions is a non-static internal property — injection is the
correct Components-layer pattern for this dependency.

Not yet DI-registered (Sub-Task F) and not yet consumed by MessageList
(Sub-Task H) — class compiles standalone.

HellionChat/Ui/Components/ChunkRenderer.cs

@@ -0,0 +1,48 @@
+using HellionChat.Themes;
+using HellionChat.Util;
+using Microsoft.Extensions.Logging;
+
+namespace HellionChat.Ui.Components;
+
+internal sealed class ChunkRenderer
+{
+    private readonly ThemeRegistry _themes;
+    private readonly FontManager _fonts;
+    private readonly ILogger<ChunkRenderer> _logger;
+    private readonly GameFunctions.GameFunctions _gameFunctions;
+    private readonly string _salt;
+
+    public ChunkRenderer(
+        ThemeRegistry themes,
+        FontManager fonts,
+        ILogger<ChunkRenderer> logger,
+        GameFunctions.GameFunctions gameFunctions
+    )
+    {
+        _themes = themes;
+        _fonts = fonts;
+        _logger = logger;
+        _gameFunctions = gameFunctions;
+        // Per-ctor random matches v1.5.6 ChatLogWindow behavior — hashed player
+        // names change every plugin reload to avoid stable cross-session linkage.
+        _salt = new Random().Next().ToString();
+
+        // Field references kept for C2 consumption; remove no-ops when DrawChunks lands.
+        _ = _themes;
+        _ = _fonts;
+        _ = _logger;
+    }
+
+    private string HidePlayerInString(string str, string playerName, uint worldId)
+    {
+        var expected = _gameFunctions.Chat.AbbreviatePlayerName(playerName);
+        var hash = HashPlayer(playerName, worldId);
+        return str.Replace(playerName, expected).Replace(expected, hash);
+    }
+
+    private string HashPlayer(string playerName, uint worldId)
+    {
+        var hashCode = $"{_salt}{playerName}{worldId}".GetHashCode();
+        return $"Player {hashCode:X8}";
+    }
+}