feat(icons): transparent in-app logo set + versioned SVG sources

design/icons/README.md

@@ -0,0 +1,29 @@
+# 图标设计源文件（SVG）
+
+PullRead 全部品牌图标的矢量源，任何尺寸/底色变体都从这里的 SVG 无损渲染，
+禁止用 Pillow 等像素工具在 PNG 上做处理（会损失画质）。
+
+## 三套文件
+
+| 前缀 | 用途 | 构成 |
+| --- | --- | --- |
+| `appicon-*.svg` | 桌面图标完整版（圆角纸白底 + mark） | 256×256，`<rect rx=56 fill=#FBFAF6>` + `translate(38.4 38.4) scale(0.7)` 的 `#1F6F54` mark |
+| `fg-*.svg` | Android 自适应图标前景（透明底，系统自己加背景） | 同 mark，透明底；对应 `drawable-xxxhdpi/ic_launcher_fg_*.png`（432px，mark 占 50%） |
+| `icon_*_transparent.svg` | 应用内 logo（透明底，mark 放大到 0.984 居中） | `translate(2 2) scale(0.984)`；对应 `assets/icon/app_logo*.png`（192px） |
+
+五个款式：`book`（默认摊开书）/ `page`（页即箭）/ `arrow`（抽页成箭）/
+`converge`（汇页箭）/ `tray`（页堆箭）。
+
+## 渲染方法
+
+用 logo-design skill 的渲染脚本（chrome 后端，无 PIL）：
+
+```bash
+python "C:/Users/d111k/.atomcode/skills/logo-design/scripts/render_png.py" \
+  design/icons/appicon-book.svg --out-dir temp/icon-design/render --size 1024
+```
+
+- 应用内 logo 输出 192px；桌面图标源用 1024px（flutter_launcher_icons 输入）
+- **注意**：该脚本 `--padding` 参数在 chrome 后端下会静默输出全空 PNG——
+  自适应图标前景不要加 padding 渲染
+- 深色底变体：直接改 SVG 的 `fill` 即可，不要事后抠色

docs/platform.md

@@ -58,9 +58,11 @@ Hard constraints:
   real-device verification; Windows has no such concept). On platforms without the
   channel, `setAppIcon` persists the preference and silently does nothing.
 - In-app logo: transparent `assets/icon/app_logo.png` is used in the home header and
-  the settings "about" page. Never use a white-background version in-app (it looks
-  wrong in dark mode). Larger marks are generated losslessly from the SVG sources in
-  `temp/icon-design/` with the logo-design skill renderer.
+  the settings "about" page (a full set `app_logo_<key>.png` covers all five marks).
+  Never use a white-background version in-app (it looks wrong in dark mode). Larger
+  marks are generated losslessly from the SVG sources in `design/icons/` (all three
+  sets: appicon / adaptive foreground / transparent in-app logo, see its README)
+  with the logo-design skill renderer.
 - `assets/icon/app_icon.png` and `app_icon_foreground.png` (book, 1024px) are the
   `flutter_launcher_icons` sources for the iOS AppIcon set and Windows `icon.ico`.
   **Set `android: false` in pubspec before running the tool and restore it

pubspec.yaml

@@ -114,8 +114,13 @@ flutter:
 
   assets:
     - assets/icons/
-    # 应用内 logo（透明底）；assets/icons/ 一套为不透明桌面图标，不在此列
+    # 应用内 logo（透明底，五个款式一套，mark 加大由 SVG 源直出）；
+    # assets/icons/ 一套为不透明桌面图标，不在此列
     - assets/icon/app_logo.png
+    - assets/icon/app_logo_page.png
+    - assets/icon/app_logo_arrow.png
+    - assets/icon/app_logo_converge.png
+    - assets/icon/app_logo_tray.png
 
   # An image asset can refer to one or more resolution-specific "variants", see
   # https://flutter.dev/to/resolution-aware-images