Fix font persistence in Lockdown mode

Keep bundled font selections active in Lockdown mode while still blocking non-bundled custom fonts. Also remove the JS-side unconditional monospace override that was resetting the selected font on tab/app reopen.

Fixes #2137.

Author: jiefeng-xu

Blink/TermView.m

@@ -831,8 +831,10 @@ - (WKUserScript *)_termInitScriptWith:(MCPParams *)params;
 {
   NSMutableArray *script = [[NSMutableArray alloc] init];
   BOOL lockdownMode = [[NSUserDefaults.standardUserDefaults objectForKey:@"LDMGlobalEnabled"] boolValue];
-  BKFont *font = lockdownMode ? nil : [BKFont withName: params.fontName ?: [BLKDefaults selectedFontName]];
-  NSString *fontFamily = font.name;
+  BKFont *selectedFont = [BKFont withName: params.fontName ?: [BLKDefaults selectedFontName]];
+  // In Lockdown mode, keep bundled fonts but disable non-bundled ones.
+  BKFont *font = (lockdownMode && selectedFont.isCustom) ? nil : selectedFont;
+  NSString *fontFamily = font.name ?: (lockdownMode ? @"monospace" : nil);
   NSString *content = font.content;
   if (font && font.isCustom && content) {
     [script addObject:term_appendUserCss(content)];

Resources/term.js

@@ -154,7 +154,6 @@ function term_init(accessibilityEnabled, lockdownMode) {
     //    document.body.style.backgroundColor = bgColor;
     //    document.body.parentNode.style.backgroundColor = bgColor;
     if (lockdownMode) {
-      term_set('font-family', 'monospace');
       term_setup(accessibilityEnabled);
     } else {
       waitForFontFamily(term_setup);