feat: bundle Noto Sans SC and Noto Serif SC (OFL) as default launcher fonts

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

HMCL/src/main/java/org/jackhuang/hmcl/setting/FontManager.java

@@ -82,7 +82,28 @@ public final class FontManager {
 
     private static final ObjectProperty<FontReference> font = new SimpleObjectProperty<>();
 
+    /// Bundled OFL fonts: Noto Sans SC for headings and controls, Noto Serif SC for body text.
+    private static final String[] BUNDLED_FONTS = {
+            "/assets/fonts/NotoSansSC-Regular.ttf",
+            "/assets/fonts/NotoSansSC-Bold.ttf",
+            "/assets/fonts/NotoSerifSC-Regular.ttf"
+    };
+
+    /// Registers the bundled fonts with JavaFX so style sheets can refer to them by family name.
+    private static void loadBundledFonts() {
+        for (String resource : BUNDLED_FONTS) {
+            try (var in = FontManager.class.getResourceAsStream(resource)) {
+                if (in == null || Font.loadFont(in, DEFAULT_FONT_SIZE) == null) {
+                    LOG.warning("Failed to load bundled font " + resource);
+                }
+            } catch (java.io.IOException e) {
+                LOG.warning("Failed to load bundled font " + resource, e);
+            }
+        }
+    }
+
     static {
+        loadBundledFonts();
         updateFont();
         LOG.info("Font: " + (font.get() != null ? font.get().family() : "System"));
     }

HMCL/src/main/resources/assets/css/font.css

@@ -2,7 +2,14 @@
  * SPDX-FileCopyrightText: Copyright (C) 2025 The HMCL Authors
  * SPDX-License-Identifier: GPL-3.0-or-later WITH AdditionRef-HMCL
  */
+/* Body text uses the serif face; headings and controls use the sans face. Both are SIL OFL fonts. */
 .root {
-    /* https://github.com/HMCL-dev/HMCL/pull/3423 */
-    -fx-font-family: -fx-base-font-family;
-}
+    -fx-font-family: "Noto Serif SC";
+}
+
+.button, .jfx-button, .toggle-button, .jfx-toggle-button, .tab-label,
+.jfx-layout-heading, .jfx-decorator-title, .method-title, .advanced-list-item .title,
+.two-line-list-item .title, .announcement .title, .bold, .html-h3, .html-bold, .class-title,
+.navigation-drawer-item, .jfx-tool-bar .label {
+    -fx-font-family: "Noto Sans SC";
+}

HMCL/src/main/resources/assets/fonts/OFL.txt

@@ -0,0 +1,93 @@
+Copyright 2014-2021 Adobe (http://www.adobe.com/), with Reserved Font Name 'Source'
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+https://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
+COPYRIGHT HOLDER BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.