Unified emoji support across builds, fixed picker bugs, and added CI checks.

data/fonts/README.md

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+# Bundled emoji font
+
+`NotoColorEmoji.ttf` reports Noto Color Emoji version 2.051 and covers
+Unicode Emoji 17.0. It is vendored from Debian's
+`fonts-noto-color-emoji` 2.051 package, built from the corresponding
+Google Noto Emoji release.
+
+Every GTK build installs this exact file: Windows (installer and portable
+build files), AppImage, Flatpak and native Meson/RPM builds. It is loaded
+into a private Pango/FreeType font map as `ZoiteChat Emoji`; an older system
+Noto font cannot replace it. No font is installed globally on Windows.
+
+Chat windows and the emoji picker share this map. Fontconfig still loads
+system fonts and configuration for ordinary text, and the configured text
+font, size and style remain in effect. In particular, plain digits, `#`
+and `*` are not assigned emoji metrics.
+
+Windows uses the same FreeType backend rather than GDI registration or an
+OS-version-specific picker. The dependency bundle already ships FreeType,
+Fontconfig and PangoFT2. This rendering path does not require Windows' native
+color-font support. Actual Windows 7 execution still needs testing on that OS.
+
+Meson requires PangoFT2 >= 1.44 and Fontconfig >= 2.13. Normal installations
+load `share/fonts/zoitechat/NotoColorEmoji.ttf` beneath the configured data
+directory; Windows resolves it relative to the executable. AppImage sets
+`ZOITECHAT_EMOJI_FONT` to its own copy. For an uninstalled development build:
+
+```sh
+ZOITECHAT_EMOJI_FONT="$PWD/data/fonts/NotoColorEmoji.ttf" build/src/fe-gtk/zoitechat
+```
+
+A missing/unloadable file logs a warning and retains system-font fallback.
+CI verifies the installed copy and tests catalog/font coverage; AppImage and
+Windows also run the interactive picker regression tests. Native themes,
+DPI and different Pango/Cairo versions can still affect pixel-level output.
+
+Upstream release: https://github.com/googlefonts/noto-emoji/releases/tag/v2.051
+
+Vendored file SHA-256:
+`dac5c27651082d6c53dab5081f50d2022ddf6877d730fa919cf6a4fc2af22de0`
+
+The font is distributed under the SIL Open Font License 1.1. See
+`OFL.txt`.