Update watch face: modular refactor + OWM/Solar/background + codegen tools

- Split render into FieldTable/Fields/Icons/Layout/Settings modules
- Add Fenix8V3Background, Owm (weather), Solar modules
- Add tools/ generators (gen_fields/gen_icons/gen_themes/gen_preview_svg)
- Tune README/manifest/strings/settings

tools/gen_icons.py

@@ -1,21 +1,24 @@
 #!/usr/bin/env python3
-"""Rasterise the design's icon paths into tintable bitmap resources.
+"""把设计稿的图标路径光栅化成可染色的位图资源。
 
-The sunrise and weather icons in design/*.svg are traced outlines whose finest
-features are two or three design pixels across.  Redrawing them from circles
-and lines works at 454 px and falls apart at 280 px, where those features land
-under one device pixel.  Rendering the real paths once per screen size and
-blitting them with drawBitmap2(:tintColor) keeps them exact everywhere.
+design/*.svg 里的日出和天气图标是描边出来的轮廓，最细的特征只有 2–3 个设计
+像素宽。用圆和线段去重画它们在 454px 上还行，到 280px 就彻底糊掉 —— 那个尺寸
+下这些细节不足一个物理像素。
+
+所以改成：把真实路径按每种屏宽各渲染一次，运行时用
+drawBitmap2(:tintColor) 染上主题色。这样每台设备拿到的都是为它的像素网格
+专门渲染的图。
 
     python3 tools/gen_icons.py
 
-Writes resources-icons-<W>/drawables/{sunrise,sunset,weather}.png plus the
-matching drawables.xml.  White pixels, alpha coverage; the theme's accent
-colour is applied at draw time via :tintColor.
+产出 resources-icons-<屏宽>/drawables/{sunrise,sunset,weather}.png 以及配套的
+drawables.xml；另外产出 resources-launcher-<尺寸>/ 下各机型要求尺寸的启动图标。
 
-MIP devices have no alpha blending, so for those widths the coverage mask is
-thresholded to hard edges rather than left antialiased -- a soft edge there
-would be quantised to something muddier than a clean one.
+⚠️ 两个要点：
+  1. drawables.xml 里必须写 packingFormat="png"。否则资源编译器会把图片压成
+     调色板格式，而 :tintColor 拒绝调色板化的源，运行时直接抛异常。
+  2. MIP 屏没有 alpha 混合，所以那几个尺寸的覆盖率蒙版会被阈值化成硬边 ——
+     软边在 64 色调色板下反而更脏。
 """
 import os
 import re