Use i18n for board component strings, show controls in edit mode, require website before editing

- Replace raw strings with useMessages hook in BoardColumn and BoardComponentSelect
- Show WebsiteControls on edit screen so users can test filters
- Disable board body editing until a website is selected
- Scope website select to team websites when editing a team board

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

public/intl/messages/en-US.json

@@ -255,6 +255,7 @@
     "select-date": "Select date",
     "select-filter": "Select filter",
     "select-role": "Select role",
+    "select-component": "Select component",
     "select-website": "Select website",
     "session": "Session",
     "session-data": "Session data",
@@ -371,6 +372,8 @@
     "reset-website": "To reset this website, type {confirmation} in the box below to confirm.",
     "reset-website-warning": "All statistics for this website will be deleted, but your settings will remain intact.",
     "saved": "Saved.",
+    "select-component-preview": "Select a component to preview",
+    "select-website-first": "Select a website first",
     "sever-error": "Server error",
     "share-url": "Your website stats are publicly available at the following URL:",
     "team-already-member": "You are already a member of the team.",