Improve descriptions and accessibility labels

[sochalewski]

Summary

• Extract the search mode picker into a dedicated SearchModePickerView.
• Render ? placeholders in search mode descriptions as Scrabble-style blank tiles.
• Update localized search mode copy in English, French, and Polish.
• Add accessibility labels for result cards and word list rows with localized point counts.
• Refresh affected snapshots and tighten snapshot precision.

Testing

• Updated snapshot baselines for search mode picker and French empty pattern result states.