fix(ts): resolve variable scoping and unused parameters in device management

Fix TypeScript issues in device-management.ts and unlinked_books.ts:

1. device-management.ts:
   - Move 'deviceType' variable declaration to function scope in showDeviceSettings()
   - Previously declared inside a Promise chain, creating potential scope issues
   - Now properly declared at function level before async operations

2. unlinked_books.ts:
   - Remove unused 'result' parameter from .then() handlers
   - Fixes autoLinkBook() and confirmManualLink() functions
   - Handlers don't use the API response result, only need success/failure

These changes improve code clarity and resolve potential runtime issues
with variable accessibility in async callback chains.

Technical details:
- deviceType: moved from Promise .then() block to function scope
- Unused parameters: removed to prevent linting warnings and improve clarity

web/src/device-management.ts

@@ -102,6 +102,8 @@ function showDeviceSettings(deviceId: string): void {
   const token = getToken();
   if (!token) return;
 
+  let deviceType: any;
+
   fetch(`/api/devices/${deviceId}`, {
     headers: { Authorization: `Bearer ${token}` },
   })
@@ -115,7 +117,7 @@ function showDeviceSettings(deviceId: string): void {
       if (syncFrequencyInput)
         syncFrequencyInput.value = String(device.sync_frequency_minutes || 60);
 
-      const deviceType = device.device_type;
+      deviceType = device.device_type;
       return fetch("/api/collections", {
         headers: { Authorization: `Bearer ${token}` },
       });

web/src/unlinked_books.ts

@@ -105,7 +105,7 @@ function autoLinkBook(
     body: JSON.stringify(data),
   })
     .then((response) => response.json())
-    .then((result) => {
+    .then(() => {
       showToast("Book linked successfully", "success");
       window.location.reload();
     })
@@ -267,7 +267,7 @@ function confirmManualLink(): void {
     body: JSON.stringify(data),
   })
     .then((response) => response.json())
-    .then((result) => {
+    .then(() => {
       showToast("Book linked successfully", "success");
       hideManualLinkModal();
       window.location.reload();