Custom emoji reaction support

Changes

• Adds support for custom emoji reacts in status buttons/popups and notifications (BE changes: pleroma!3845 (merged))
• Reuses status emoji picker, picker parametrized with custom emoji feature availability
• Change in regards to akkoma implementation: no emoji button enlargement here. Added configurable reactions size scale.

Compatibility concern: there is no way to detect presence of changes on BE, with reused emoji picker users of older BE may be presented with selection of custom emojis that will be rejected as invalid by unchanged BE, if picked.

src/boot/after_store.js

@@ -253,6 +253,7 @@ const getNodeInfo = async ({ store }) => {
       store.dispatch('setInstanceOption', { name: 'safeDM', value: features.includes('safe_dm_mentions') })
       store.dispatch('setInstanceOption', { name: 'shoutAvailable', value: features.includes('chat') })
       store.dispatch('setInstanceOption', { name: 'pleromaChatMessagesAvailable', value: features.includes('pleroma_chat_messages') })
+      store.dispatch('setInstanceOption', { name: 'pleromaCustomEmojiReactionsAvailable', value: features.includes('pleroma_custom_emoji_reactions') })
       store.dispatch('setInstanceOption', { name: 'gopherAvailable', value: features.includes('gopher') })
       store.dispatch('setInstanceOption', { name: 'pollsAvailable', value: features.includes('polls') })
       store.dispatch('setInstanceOption', { name: 'editingAvailable', value: features.includes('editing') })