fix(tabs): show only the query in search tab titles

[kdroidFilter]

Summary

• Removes the תוצאות חיפוש : (Search results :) prefix from search tabs so the searched text is visible directly in the tab label.
• Behavior is now consistent with book tabs, which already show just the book name.
• Window title, dock menu and jump-list entries keep the descriptive prefix (out of scope for the tab issue).

Closes #485

Test plan

• Run a search; confirm the tab title shows only the query text.
• Open a book; confirm the book tab still shows the book name.
• Confirm the home tab still shows "דף הבית - ".