Injection panel UX: reachable auto re-attach + explain disabled controls

- The "Auto re-attach this game on relaunch" checkbox (and the Vulkan-layer
  checkbox) lived inside the connected-only block, so after a disconnect the
  control vanished while auto_reattach_ could stay enabled -- an active,
  invisible flag. Move both to render whenever a target is selected, connected or
  not, so they can be set up pre-launch and toggled off after disconnect.
- Explain why controls are greyed out: an inline hint under the subsystem toggles
  when no live game is connected, and a hover tooltip (AllowWhenDisabled) on the
  disabled "Inject & Connect" button telling the operator to pick a target.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

README.md

@@ -113,11 +113,6 @@ default** and covers anything the hooked path doesn't.
 From an in-depth review pass. Each item is fixed test-first (a failing test, then the fix) and lands
 as its own commit; "verify" items are confirmed real before any change, and dropped if not.
 
-UX:
-- **Auto re-attach control** — keep it visible/controllable when not connected (today it can be
-  enabled-but-invisible).
-- **Tooltips on disabled controls** — explain *why* Inject/subsystem controls are disabled.
-
 Code quality:
 - **Stale comments** — `hook_guard.hpp` top block (still the old destroy-on-remove model),
   `input_source.hpp` ("future" Steam source), `audio_ring.hpp` (v1/reserved), `shared_memory.hpp` /

host/src/injection_panel.cpp

@@ -561,6 +561,10 @@ void InjectionPanel::draw_hook_status(bool debug_details)
 	ImGui::BeginDisabled(target_state_ != TargetState::Alive);
 	draw_subsystem_controls(status);
 	ImGui::EndDisabled();
+	if (target_state_ != TargetState::Alive)
+	{
+		ImGui::TextDisabled("(connect to a live game to change these)"); // why the toggles are locked
+	}
 	ImGui::TextDisabled("Controller poll rates are in the Controllers panel.");
 
 	draw_hook_list(status);
@@ -636,40 +640,41 @@ void InjectionPanel::draw(bool debug_details)
 			ImGui::SameLine();
 			ImGui::TextDisabled("(relaunched %s)", narrow(selected_name_).c_str());
 		}
-		// Session-only auto re-attach: tick it (while attached or terminated), then kill +
+		ImGui::Separator();
-		// relaunch the game and it re-injects itself early -- the kill+relaunch fix for a
+	}
-		// wrong audio format, without picking a target again.
+
-		if (!selected_name_.empty())
+	// Session options for the selected game, shown whether or not we're connected -- so they can be set
+	// up before launching the game, and an enabled auto re-attach is never hidden after a disconnect.
+	if (!selected_name_.empty())
+	{
+		// Session-only auto re-attach: tick it, then kill + relaunch the game and it re-injects itself
+		// early -- the kill+relaunch fix for a wrong audio format, without picking a target again.
+		ImGui::Checkbox("Auto re-attach this game on relaunch", &auto_reattach_);
+		if (auto_reattach_ && target_state_ == TargetState::Terminated)
 		{
-			ImGui::Checkbox("Auto re-attach this game on relaunch", &auto_reattach_);
+			ImGui::SameLine();
-			if (auto_reattach_ && target_state_ == TargetState::Terminated)
+			ImGui::TextColored(kGrey, "(watching for %s...)", narrow(selected_name_).c_str());
+		}
+		// Opt-in Vulkan capture layer: for Vulkan games that initialize Vulkan immediately (where even
+		// auto-attach injects too late -- see the red banner), register a per-user implicit layer scoped
+		// to this game so the next launch is captured from the first frame. Removed when unticked / exit.
+		if (ImGui::Checkbox("Set up Vulkan layer (for immediate-init Vulkan games)", &vk_layer_enabled_))
+		{
+			if (vk_layer_enabled_)
 			{
-				ImGui::SameLine();
+				vk_layer_enabled_ = register_vk_layer(selected_name_);
-				ImGui::TextColored(kGrey, "(watching for %s...)", narrow(selected_name_).c_str());
 			}
-			// Opt-in Vulkan capture layer: for Vulkan games that initialize Vulkan immediately
+			else
-			// (where even auto-attach injects too late -- see the red banner), register a per-user
-			// implicit layer scoped to this game so the next launch is captured from the first frame.
-			// Removed when unticked or the host exits.
-			if (ImGui::Checkbox("Set up Vulkan layer (for immediate-init Vulkan games)", &vk_layer_enabled_))
 			{
-				if (vk_layer_enabled_)
+				unregister_vk_layer();
-				{
-					vk_layer_enabled_ = register_vk_layer(selected_name_);
-				}
-				else
-				{
-					unregister_vk_layer();
-				}
-			}
-			if (ImGui::IsItemHovered())
-			{
-				ImGui::SetTooltip("Registers a per-user (HKCU, no admin) implicit Vulkan layer scoped to\n"
-				                  "this game, so a relaunch is captured before Vulkan init. Pair with\n"
-				                  "Auto re-attach. Removed when you untick it or close the tool.");
 			}
 		}
-		ImGui::Separator();
+		if (ImGui::IsItemHovered())
+		{
+			ImGui::SetTooltip("Registers a per-user (HKCU, no admin) implicit Vulkan layer scoped to\n"
+			                  "this game, so a relaunch is captured before Vulkan init. Pair with\n"
+			                  "Auto re-attach. Removed when you untick it or close the tool.");
+		}
 	}
 
 	ImGui::TextUnformatted("Target window");
@@ -737,6 +742,12 @@ void InjectionPanel::draw(bool debug_details)
 		inject_selected();
 	}
 	ImGui::EndDisabled();
+	// Explain the disabled state on hover (AllowWhenDisabled, since the button is greyed out).
+	if (!can_inject && ImGui::IsItemHovered(ImGuiHoveredFlags_AllowWhenDisabled))
+	{
+		ImGui::SetTooltip("Pick a target window or process above first.\n"
+		                  "If the game already has the DLL (e.g. after a reconnect), this reuses it.");
+	}
 
 	if (!status_.empty())
 	{