fonts: consolidate font-family to global stack, self-host subset emoji font

Remove redundant `font-family: sans-serif` from 18 component-level
declarations — they now inherit the Helvetica/Arial/Noto Sans stack
from the global `*` selector in app.css.

Add self-hosted NotoColorEmoji subset (56 KB, down from 11 MB) as
fallback for systems without the Noto Color Emoji font installed.
The subset is generated at prebuild time via pyftsubset with a fixed
list of the ~32 emojis actually used on the site.

scripts/subset-emoji-font.sh

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+# Subset NotoColorEmoji to only the emojis we actually use.
+# Requires: fonttools (provides pyftsubset) and woff2 (provides woff2_compress)
+#
+# Source font: system-installed NotoColorEmoji.ttf
+# Output: static/fonts/NotoColorEmoji.woff2 + .ttf
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
+OUT_DIR="$PROJECT_ROOT/static/fonts"
+
+SRC_FONT="/usr/share/fonts/noto/NotoColorEmoji.ttf"
+
+if [ ! -f "$SRC_FONT" ]; then
+	echo "Error: Source font not found at $SRC_FONT" >&2
+	exit 1
+fi
+
+# ─── Fixed list of emojis to include ────────────────────────────────
+# Recipe icons (from database + hardcoded)
+# Season/liturgical: ☀️ ✝️ ❄️ 🌷 🍂 🎄 🐇
+# Food/recipe: 🍽️ 🥫
+# UI/cospend categories: 🛒 🛍️ 🚆 ⚡ 🎉 🤝 💸
+# Status/feedback: ❤️ 🖤 ✅ ❌ 🚀 ⚠️ ✨ 🔄
+# Features: 📋 🖼️ 📖 🤖 🌐 🔐 🔍 🚫
+
+EMOJIS="☀✝❄🌷🍂🎄🐇🍽🥫🛒🛍🚆⚡🎉🤝💸❤🖤✅❌🚀⚠✨🔄📋🖼📖🤖🌐🔐🔍🚫"
+# ────────────────────────────────────────────────────────────────────
+
+# Build Unicode codepoint list from the emoji string
+UNICODES=""
+for char in $(echo "$EMOJIS" | grep -oP '.'); do
+	code=$(printf 'U+%04X' "'$char")
+	if [ -n "$UNICODES" ]; then
+		UNICODES="$UNICODES,$code"
+	else
+		UNICODES="$code"
+	fi
+done
+
+echo "Subsetting NotoColorEmoji with $(echo "$EMOJIS" | grep -oP '.' | wc -l) glyphs..."
+
+# Subset to TTF
+pyftsubset "$SRC_FONT" \
+	--unicodes="$UNICODES" \
+	--output-file="$OUT_DIR/NotoColorEmoji.ttf" \
+	--no-ignore-missing-unicodes
+
+# Convert to WOFF2
+woff2_compress "$OUT_DIR/NotoColorEmoji.ttf"
+
+ORIG_SIZE=$(stat -c%s "$SRC_FONT" 2>/dev/null || stat -f%z "$SRC_FONT")
+TTF_SIZE=$(stat -c%s "$OUT_DIR/NotoColorEmoji.ttf" 2>/dev/null || stat -f%z "$OUT_DIR/NotoColorEmoji.ttf")
+WOFF2_SIZE=$(stat -c%s "$OUT_DIR/NotoColorEmoji.woff2" 2>/dev/null || stat -f%z "$OUT_DIR/NotoColorEmoji.woff2")
+
+echo "Done!"
+echo "  Original: $(numfmt --to=iec "$ORIG_SIZE")"
+echo "  TTF:      $(numfmt --to=iec "$TTF_SIZE")"
+echo "  WOFF2:    $(numfmt --to=iec "$WOFF2_SIZE")"