sort by usage count to quickly search, find and open the items/entries because of often search

every item sort by usage count in keepassdx, and searching items also sort by usage count, including keyboard.

every time when i search the keywords in the keepassdx, i must scoll page to find and use the entry becuase my entries are so many that i often use the search founction to find and open.

Start by tracing the item list, search flow, and keyboard entry flow described in the issue, then identify whether usage counts are already recorded. Define how usage is counted and how ties are handled before changing the ordering. Done means frequently used entries appear first in normal lists and keyword searches, including keyboard results, with coverage for each affected flow.

Written by the indexing model from the issue text.