fix(home): show book autocomplete popup only for the selected tab

[kdroidFilter]

Summary

Fixes a duplicate book-autocompletion popup on the Home page (reported as the "כפול" / double popup).

Root cause:

• The suggestion state is owned by a single shared SearchHomeViewModel, but every open tab stays composed permanently (non-selected tabs are measured with layout(0, 0) {} so they draw nothing).
• A Popup renders in its own window and escapes that layout(0, 0) trick. So whenever suggestionsVisible = true, every composed tab whose SearchBar is in reference mode drew its own popup window → two identical popups overlapping at different anchors.

Fix:

• Gate the suggestions overlay in SearchBar on LocalTabSelected.current, so only the currently selected tab renders the popup. Reuses the existing LocalTabSelected composition local already used elsewhere for per-tab gating.

Test plan

• Open two Home tabs, type a book query in one → only one popup appears
• Switch tabs while the popup is open → popup follows the active tab, no duplicate
• Single Home tab still shows suggestions and book/category/TOC picking works as before