fix: UI polish — overflow, placeholders, dashboard provider card

- Fix bot card header overflow by replacing "Sync with Telegram" text
  button with icon button, add flex-wrap
- Rename sync button label to "Sync Commands"
- Remove decorative dashes from selector placeholders (— X — → X)
- Show selected provider name/icon in dashboard stat card when global
  provider filter is active
- Add selector placeholder convention to frontend-architecture.md

frontend/src/lib/i18n/en.json

@@ -330,7 +330,7 @@
 		"rateFind": "Find cooldown",
 		"rateDefault": "Default cooldown",
 		"noCommandsForProvider": "This provider type does not support bot commands.",
-		"syncCommands": "Sync with Telegram",
+		"syncCommands": "Sync Commands",
 		"discoverChats": "Discover chats from Telegram",
 		"clickToCopy": "Click to copy chat ID",
 		"chatsDiscovered": "Chats discovered",
@@ -873,7 +873,7 @@
 		"favoritesOnly": "Favorites only",
 		"targetAlbum": "Target Album",
 		"selectAlbum": "Album",
-		"selectAlbumPlaceholder": "— Select album —",
+		"selectAlbumPlaceholder": "Select album",
 		"albumId": "Album ID",
 		"createAlbumIfMissing": "Create album if it doesn't exist",
 		"newAlbumName": "New album name",