fix: improve macOS WebView initialization for JavaScript execution

CHANGES:
- Increased WebView size from 1x1 to 100x100 (minimum viable size)
- Changed positioning: use setAlphaValue:0 (transparent) instead of offscreen (-10000, -10000)
- Improved console.log capture: preserve original console.log and forward to Unity
- Prevents breaking JavaScript libraries that depend on console.log

RATIONALE:
WKWebView may not properly initialize or execute JavaScript with extremely
small sizes (1x1). Using 100x100 with alpha=0 ensures the WebView is functional
while remaining invisible to the user.

Author: rodrigo-fournier-immutable

Plugins/Mac/Sources/ImmutableWebView.mm

@@ -119,7 +119,13 @@ - (id)initWithUa:(const char *)ua
         } \
         }; \
         window.UnityPostMessage = window.Unity.call; \
-        function captureLog(msg) { window.webkit.messageHandlers.logHandler.postMessage(msg); } window.console.log = captureLog; \
+        (function() { \
+            var originalLog = console.log; \
+            console.log = function(msg) { \
+                try { window.webkit.messageHandlers.logHandler.postMessage(String(msg)); } catch(e) {} \
+                originalLog.apply(console, arguments); \
+            }; \
+        })(); \
         ";
 
     WKUserScript *script
@@ -144,17 +150,18 @@ - (id)initWithUa:(const char *)ua
     webView.UIDelegate = self;
     webView.navigationDelegate = self;
 
-    // CRITICAL: WebView must be in view hierarchy and not hidden to execute JavaScript
-    // Even though we don't need UI, we add it offscreen to ensure JavaScript runs
+    // CRITICAL: WebView must be in view hierarchy to execute JavaScript
+    // Use a reasonable minimum size (100x100) and make it transparent instead of tiny/offscreen
     webView.hidden = NO;
-    webView.frame = CGRectMake(-10000, -10000, 1, 1); // Position offscreen
+    webView.frame = CGRectMake(0, 0, 100, 100); // Minimum viable size
+    [webView setAlphaValue:0.0]; // Make completely transparent (invisible but functional)
 
     // Add to main window to ensure JavaScript execution
     NSArray *windows = [[NSApplication sharedApplication] windows];
     if ([windows count] > 0) {
         NSWindow *mainWindow = [windows objectAtIndex:0];
         [[mainWindow contentView] addSubview:webView];
-        NSLog(@"[ImmutableWebView] WebView added to main window for JavaScript execution");
+        NSLog(@"[ImmutableWebView] WebView (100x100, alpha=0) added to main window for JavaScript execution");
     } else {
         NSLog(@"[ImmutableWebView] WARNING: No window available, WebView may not execute JavaScript");
     }