fix(input): force Genshin foreground via AttachThreadInput (auto-scan no longer aborts)

Auto-scan aborted immediately with "Genshin konnte nicht in den Vordergrund
geholt werden". Root cause: the focus call runs in the background input/capture
helper process, and Windows' foreground lock silently refuses SetForegroundWindow
from a process that is neither foreground nor the last input source. When the user
clicks "Auto-Scan starten" the Electron window is foreground, so the helper's plain
SetForegroundWindow is dropped and focus stays false.

Fix (both the C# sidecar and the PowerShell fallback): before SetForegroundWindow,
attach our thread's input queue to the target (and current-foreground) window
thread with AttachThreadInput and clear SPI_..FOREGROUNDLOCKTIMEOUT, then restore.
This is the same technique Inventory Kamera and other reliable automators use; it
is what our helper was missing after the old ALT-tap workaround was removed on the
wrong assumption that equal integrity level is sufficient (that only covers UIPI
input injection, not foreground changes).

Sidecar recompiled + republished; electron build green.

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

src/services/assistantBridge.ts

@@ -51,6 +51,7 @@ export interface AssistantBridge {
   publishScannerStatus: (status: ScannerStatusPayload) => Promise<BooleanResult>;
   focusMainWindow: () => Promise<BooleanResult>;
   focusGenshin: () => Promise<FocusGenshinResult>;
+  focusGenshinForScanStart: () => Promise<FocusGenshinResult>;
   clickScreen: (x: number, y: number) => Promise<ClickResult>;
   scrollScreen: (notches: number, anchorX?: number, anchorY?: number) => Promise<ScrollResult>;
   onScannerCommand: (callback: (command: "start-auto" | "stop") => void) => () => void;
@@ -66,6 +67,7 @@ export function getAssistantBridge(): AssistantBridge | null {
   const apiRecord = api as unknown as Record<string, unknown>;
   const canAutoScan = hasFunction(apiRecord, "clickScreen") && hasFunction(apiRecord, "scrollScreen");
   const canReviewSamples = hasFunction(apiRecord, "loadReviewSamples") && hasFunction(apiRecord, "saveReviewSample");
+  const hasFocusGenshinForScanStart = hasFunction(apiRecord, "focusGenshinForScanStart");
 
   return {
     isAvailable: true,
@@ -90,6 +92,7 @@ export function getAssistantBridge(): AssistantBridge | null {
     publishScannerStatus: (status) => api.publishScannerStatus(status),
     focusMainWindow: () => api.focusMainWindow(),
     focusGenshin: () => api.focusGenshin(),
+    focusGenshinForScanStart: () => (hasFocusGenshinForScanStart ? api.focusGenshinForScanStart() : api.focusGenshin()),
     clickScreen: (x: number, y: number) => api.clickScreen(x, y),
     scrollScreen: (notches: number, anchorX?: number, anchorY?: number) => api.scrollScreen(notches, anchorX, anchorY),
     showOverlay: () => api.showOverlay(),