Rename Number Tag labels to Item Tag for identifier alignment

[dadachi]

Summary

• Free-Android port of nativeapptemplate/NativeAppTemplate-Android#37.
• Aligns UI labels with the ItemTag identifier (Phase 2 pre-step), so future humanize-based string-literal rename logic (Phase 6) can rewrite them consistently.
• Renames in-scope generic labels only; queue-specific strings (swipe_number_tag_below, server_number_tags_webpage*, reset_number_tags*, onboarding_description*, complete_scan_help, show_tag_info_scan_help) are intentionally kept — they'll be deleted alongside NFC/scan/reset code in Phase 2 Part A.
• Also renames resource identifier R.string.label_shop_settings_manage_number_tags → R.string.label_shop_settings_manage_item_tags and updates its 3 callers.

Label changes (app/src/main/res/values/strings.xml)

• Manage Number Tags → Manage Item Tags
• Tag Number → Name (aligns with ItemTag.name after Phase 1 API refactor)
• Add a new number tag… → Add a new item tag…
• Tag number is invalid. → Item tag name is invalid.
• Direct literals in ItemTagCreateView/ItemTagEditView supporting text: Tag Number must be a 2-N alphanumeric characters. → Name must be a 2-N alphanumeric characters.

Test plan

• ./gradlew assembleDebug succeeds (verified locally: BUILD SUCCESSFUL)
• ./gradlew test passes (verified locally: BUILD SUCCESSFUL)
• Manual UI check: Shop Settings shows Manage Item Tags; ItemTag list title shows Manage Item Tags
• Manual UI check: ItemTag Create/Edit field header shows Name, supporting text shows Name must be a 2-N alphanumeric characters. and Item tag name is invalid. on invalid input
• grep -rn "Number Tag" --include="*.kt" --include="*.xml" in source returns only out-of-scope queue/scan/onboarding entries in strings.xml
• grep -rn "Tag Number" --include="*.kt" --include="*.xml" in source returns nothing

🤖 Generated with Claude Code