chore: Add Fastlane metadata length validation to CI

.github/workflows/code-checks.yml

@@ -58,4 +58,13 @@ jobs:
         uses: ./.github/actions/common-setup
 
       - name: Test modules
-        run: ./gradlew ${{ matrix.flavor }}${{ matrix.variant }}UnitTest
+        run: ./gradlew ${{ matrix.flavor }}${{ matrix.variant }}UnitTest
+
+  check-fastlane-metadata:
+    name: Fastlane metadata
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout source code
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd #v6.0.2
+      - name: Validate metadata lengths
+        run: bash fastlane/check_metadata_length.sh

fastlane/check_metadata_length.sh

@@ -0,0 +1,99 @@
+#!/usr/bin/env bash
+#
+# Validates Fastlane metadata files stay within store character limits.
+#
+# Checked files per locale:
+#   title.txt             - hard limit 30 chars
+#   short_description.txt - hard limit 80 chars
+#   full_description.txt  - hard limit 3800 chars, warn at 3700
+#   changelogs/*.txt      - hard limit 500 chars each
+
+set -euo pipefail
+export LC_ALL=C.UTF-8
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+METADATA_DIR="$SCRIPT_DIR/metadata/android"
+
+TITLE_MAX=30
+SHORT_DESC_MAX=80
+FULL_DESC_MAX=3800
+FULL_DESC_WARN=3700
+CHANGELOG_MAX=500
+
+failed=0
+warned=0
+checked=0
+
+# Count characters excluding only the trailing newline
+count_chars() {
+    sed -z 's/\n$//' < "$1" | wc -m | tr -d '[:space:]'
+}
+
+check_file() {
+    local file="$1"
+    local label="$2"
+    local hard_limit="$3"
+    local warn_limit="${4:-0}"
+
+    if [ ! -f "$file" ]; then
+        return
+    fi
+
+    local chars
+    chars="$(count_chars "$file")"
+    checked=$((checked + 1))
+
+    if [ "$chars" -gt "$hard_limit" ]; then
+        echo "FAIL  $label: $chars chars (limit: $hard_limit)"
+        failed=$((failed + 1))
+    elif [ "$warn_limit" -gt 0 ] && [ "$chars" -gt "$warn_limit" ]; then
+        echo "WARN  $label: $chars chars (approaching limit)"
+        warned=$((warned + 1))
+    fi
+}
+
+if [ ! -d "$METADATA_DIR" ]; then
+    echo "ERROR: Metadata directory not found: $METADATA_DIR"
+    exit 1
+fi
+
+locale_count=0
+for locale_dir in "$METADATA_DIR"/*/; do
+    [ -d "$locale_dir" ] || continue
+    locale="$(basename "$locale_dir")"
+    locale_count=$((locale_count + 1))
+
+    check_file "$locale_dir/title.txt" "$locale/title.txt" "$TITLE_MAX"
+    check_file "$locale_dir/short_description.txt" "$locale/short_description.txt" "$SHORT_DESC_MAX"
+    check_file "$locale_dir/full_description.txt" "$locale/full_description.txt" "$FULL_DESC_MAX" "$FULL_DESC_WARN"
+
+    for changelog in "$locale_dir"/changelogs/*.txt; do
+        [ -f "$changelog" ] || continue
+        changelog_name="changelogs/$(basename "$changelog")"
+        check_file "$changelog" "$locale/$changelog_name" "$CHANGELOG_MAX"
+    done
+done
+
+if [ "$locale_count" -eq 0 ]; then
+    echo "ERROR: No locale directories found in $METADATA_DIR"
+    exit 1
+fi
+
+if [ "$checked" -eq 0 ]; then
+    echo "ERROR: No metadata files found to check"
+    exit 1
+fi
+
+echo ""
+echo "Checked $checked files across $locale_count locales."
+
+if [ "$failed" -gt 0 ]; then
+    echo "$failed failure(s), $warned warning(s)."
+    exit 1
+fi
+
+if [ "$warned" -gt 0 ]; then
+    echo "All within limits. $warned warning(s)."
+fi
+
+exit 0