perf(settings): write config on release instead of every slider frame

ImGui sliders report a change in every frame the value moves, so dragging one
rewrote the full 31 KB config to disk per frame -- serialize, fsync and rename,
synchronously on the draw thread. Measured on Linux/Wine that showed up as a
114 ms frame while the plugin itself only drew for 2.9 ms; the rest was waiting
on the write.

The five shared slider helpers now defer SaveConfig to IsItemDeactivatedAfterEdit,
matching what ChatColourPicker already did for the colour wheel.

Renaming a tab needed its own path: the input lives inside a popup, and ImGui
never re-submits it when the popup is dismissed by clicking outside, so
IsItemDeactivatedAfterEdit would not fire and the new name would be lost. A
pending-rename marker scoped to the owning tab flushes it when the popup is
gone -- scoped, because every other tab's Draw reaches that branch too.

DeferredSaveFrames is removed: the debounce was fully wired but never armed,
and this approach makes it redundant.

HellionChat/Plugin.cs

@@ -175,8 +175,6 @@ public sealed class Plugin : IAsyncDalamudPlugin
     // PerformanceBaselineStep so the hot path stays allocation-free.
     internal double LastDrawMs;
 
-    internal int DeferredSaveFrames = -1;
-
     // Cancels the v1.4.8 FTS5 bulk-insert worker on plugin teardown. The
     // worker runs off the framework thread on its own SqliteConnection, so a
     // Dispose mid-rebuild must signal cancellation before MessageManager
@@ -277,8 +275,6 @@ public sealed class Plugin : IAsyncDalamudPlugin
 
         ImGuiUtil.Initialize(this);
 
-        DeferredSaveFrames = -1;
-
         // Custom themes dir + seed run before the container builds so the
         // ThemeRegistry factory lambda finds the directory ready.
         var customThemesDir = Path.Combine(Interface.ConfigDirectory.FullName, "themes");
@@ -641,19 +637,6 @@ public sealed class Plugin : IAsyncDalamudPlugin
             }
         );
 
-        // Flush a pending DeferredSave — FrameworkUpdate won't fire it anymore.
-        failure = CaptureFailure(
-            failure,
-            () =>
-            {
-                if (DeferredSaveFrames >= 0)
-                {
-                    SaveConfig();
-                    DeferredSaveFrames = -1;
-                }
-            }
-        );
-
         // Framework-thread cleanup the container does not reach.
         try
         {
@@ -1134,9 +1117,6 @@ public sealed class Plugin : IAsyncDalamudPlugin
 
     private void FrameworkUpdate(IFramework framework)
     {
-        if (DeferredSaveFrames >= 0 && DeferredSaveFrames-- == 0)
-            SaveConfig();
-
         if (!Config.HideChat)
             return;
 

HellionChat/Ui/Components/Settings/Tabs/ChannelsTab.cs

@@ -116,10 +116,11 @@ internal sealed class ChannelsTab
     {
         var current = get();
         ImGui.SetNextItemWidth(200);
+        // Sliders report a change every frame while dragging; deferring the write
+        // to release turns ~30 full-config disk writes per second into one.
         if (ImGui.SliderInt(label, ref current, min, max, "%d"))
-        {
             set(current);
+        if (ImGui.IsItemDeactivatedAfterEdit())
             _plugin.SaveConfig();
     }
-    }
 }

HellionChat/Ui/Components/Settings/Tabs/DataPrivacyTab.cs

@@ -108,10 +108,11 @@ internal sealed class DataPrivacyTab
     {
         var current = get();
         ImGui.SetNextItemWidth(200);
+        // Sliders report a change every frame while dragging; deferring the write
+        // to release turns ~30 full-config disk writes per second into one.
         if (ImGui.SliderInt(label, ref current, min, max, "%d"))
-        {
             set(current);
+        if (ImGui.IsItemDeactivatedAfterEdit())
             _plugin.SaveConfig();
     }
-    }
 }

HellionChat/Ui/Components/Settings/Tabs/GeneralTab.cs

@@ -80,12 +80,13 @@ internal sealed class GeneralTab
     {
         var current = get();
         ImGui.SetNextItemWidth(200);
+        // Sliders report a change every frame while dragging; deferring the write
+        // to release turns ~30 full-config disk writes per second into one.
         if (ImGui.SliderFloat(label, ref current, min, max, "%.2f"))
-        {
             set(current);
+        if (ImGui.IsItemDeactivatedAfterEdit())
             _plugin.SaveConfig();
     }
-    }
 
     // Wires the already-present ImGuiUtil.KeybindInput capture widget (dead/unwired
     // since the v1.6.0 rewrite) back into the settings, so ChatTabForward/Backward

HellionChat/Ui/Components/Settings/Tabs/WindowTab.cs

@@ -134,21 +134,23 @@ internal sealed class WindowTab
     {
         var current = get();
         ImGui.SetNextItemWidth(200);
+        // Sliders report a change every frame while dragging; deferring the write
+        // to release turns ~30 full-config disk writes per second into one.
         if (ImGui.SliderFloat(label, ref current, min, max, "%.2f"))
-        {
             set(current);
+        if (ImGui.IsItemDeactivatedAfterEdit())
             _plugin.SaveConfig();
     }
-    }
 
     private void DrawSliderInt(string label, Func<int> get, Action<int> set, int min, int max)
     {
         var current = get();
         ImGui.SetNextItemWidth(200);
+        // Sliders report a change every frame while dragging; deferring the write
+        // to release turns ~30 full-config disk writes per second into one.
         if (ImGui.SliderInt(label, ref current, min, max, "%d"))
-        {
             set(current);
+        if (ImGui.IsItemDeactivatedAfterEdit())
             _plugin.SaveConfig();
     }
-    }
 }

HellionChat/Ui/Components/TabContextMenu.cs

@@ -12,6 +12,12 @@ namespace HellionChat.Ui.Components;
 // state and reaches the live Config/Plugin through Plugin.Instance/Plugin.Config.
 internal static class TabContextMenu
 {
+    // Pending rename, scoped to one tab. ImGui never re-submits the input when the
+    // popup is dismissed by clicking outside, so IsItemDeactivatedAfterEdit never
+    // fires there — without this the rename would be lost.
+    private static Guid _renamingTab;
+    private static bool _renameDirty;
+
     // MUST be called immediately after the row-carrying ImGui item (Sidebar
     // "row" InvisibleButton / TopTabBar Selectable). popupId only names the
     // popup; the open trigger is a right-click on the LAST submitted item
@@ -20,7 +26,18 @@ internal static class TabContextMenu
     public static void Draw(Tab tab, string popupId, Windows.ChannelPopoutPool pool)
     {
         if (!ImGui.BeginPopupContextItem(popupId))
+        {
+            // Popup gone: flush a pending rename. Scoped to the OWNING tab — every
+            // other tab's Draw lands here too and would flush foreign state.
+            if (_renamingTab == tab.Identifier)
+            {
+                if (_renameDirty)
+                    Plugin.Instance.SaveConfig();
+                ClearPendingRename();
+            }
+
             return;
+        }
 
         // Rename: focus the field the first frame the popup appears.
         if (ImGui.IsWindowAppearing())
@@ -28,7 +45,19 @@ internal static class TabContextMenu
         ImGui.SetNextItemWidth(250f * ImGuiHelpers.GlobalScale);
         var name = tab.Name;
         if (ImGui.InputText("##tab-name", ref name, 512) && ApplyTabRename(tab, name))
+        {
+            _renamingTab = tab.Identifier;
+            _renameDirty = true;
+        }
+
+        // Covers leaving the field while the popup stays open; the dismissed-popup
+        // case is handled above.
+        if (ImGui.IsItemDeactivatedAfterEdit() && _renamingTab == tab.Identifier)
+        {
+            if (_renameDirty)
                 Plugin.Instance.SaveConfig();
+            ClearPendingRename();
+        }
 
         // Per-tab notification sound (B3-3). The checkbox gates the picker so
         // tabs that never want a sound keep the popup short.
@@ -49,6 +78,15 @@ internal static class TabContextMenu
         ImGui.EndPopup();
     }
 
+    // The flush depends on Draw running once more for this tab. If it never does —
+    // LRU eviction, logout, window closed or collapsed, plugin unload, game exit —
+    // the name only lives in memory until some other SaveConfig happens to run.
+    private static void ClearPendingRename()
+    {
+        _renamingTab = Guid.Empty;
+        _renameDirty = false;
+    }
+
     // Sound picker: 16 numbered game sounds, a separator, then the 3 bundled
     // Hellion clips stored as ids 17-19 (1.5.6 parity order). The collapsed
     // preview reuses the entry label scheme so the current pick reads the same