implement Default traits

src/app/browser/window/tab/item/page/content/text/gemini/reader/ansi/tag.rs

@@ -6,6 +6,12 @@ pub struct Tag {
     pub text_tag: TextTag,
 }
 
+impl Default for Tag {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Tag {
     // Constructors
 

src/app/browser/window/tab/item/page/content/text/gemini/reader/syntax.rs

@@ -35,6 +35,12 @@ pub struct Syntax {
     theme_set: ThemeSet,
 }
 
+impl Default for Syntax {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Syntax {
     // Constructors
 

src/app/browser/window/tab/item/page/content/text/gemini/reader/syntax/tag.rs

@@ -6,6 +6,12 @@ pub struct Tag {
     pub text_tag: TextTag,
 }
 
+impl Default for Tag {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Tag {
     // Constructors
 

src/app/browser/window/tab/item/page/content/text/gemini/reader/tag.rs

@@ -20,6 +20,12 @@ pub struct Tag {
     pub plain: TextTag,
 }
 
+impl Default for Tag {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Tag {
     // Construct
     pub fn new() -> Self {

src/app/browser/window/tab/item/page/content/text/plain/reader.rs

@@ -4,6 +4,12 @@ pub struct Reader {
     widget: Label,
 }
 
+impl Default for Reader {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl Reader {
     // Construct
     pub fn new() -> Self {