Unicode improvements and version bump.

- Added full UTF-8 support for terminal rendering, including multi-width character handling.
- Improved font handling in ImGui with expanded glyph support (Greek, Mathematical Operators).
- Updated locale initialization to enable proper character rendering.
- Bumped version to 1.5.8.

fonts/Font.cc

@@ -8,16 +8,43 @@ Font::Load(const float size) const
 {
 	const ImGuiIO &io = ImGui::GetIO();
 	io.Fonts->Clear();
-	const ImFont *font = io.Fonts->AddFontFromMemoryCompressedTTF(
+
+	ImFontConfig config;
+	config.MergeMode = false;
+
+	// Load Basic Latin + Latin Supplement
+	io.Fonts->AddFontFromMemoryCompressedTTF(
 		this->data_,
 		this->size_,
-		size);
+		size,
+		&config,
+		io.Fonts->GetGlyphRangesDefault());
 
-	if (!font) {
-		font = io.Fonts->AddFontDefault();
-	}
+	// Merge Greek and Coptic
+	config.MergeMode                    = true;
+	static const ImWchar greek_ranges[] = {
+		0x0370, 0x03FF, // Greek and Coptic
+		0,
+	};
+	io.Fonts->AddFontFromMemoryCompressedTTF(
+		this->data_,
+		this->size_,
+		size,
+		&config,
+		greek_ranges);
+
+	// Merge Mathematical Operators
+	static const ImWchar math_ranges[] = {
+		0x2200, 0x22FF, // Mathematical Operators
+		0,
+	};
+	io.Fonts->AddFontFromMemoryCompressedTTF(
+		this->data_,
+		this->size_,
+		size,
+		&config,
+		math_ranges);
 
-	(void) font;
 	io.Fonts->Build();
 }
 } // namespace kte::Fonts