feat(readarr): scroll and dismiss the edition details popup

Add EditionDetailsHandler, the single block popup opened from the editions
table. It owns the arrow, Home and End scrolling over its ScrollableText body,
and the Esc that pops the popup and clears the edition details modal.

The handler is nested under BookDetailsHandler, which claims the block ahead
of its own tables. It never sees the keypress that opens it, so it performs no
build, and it dispatches no network events: the popup is assembled from an
already loaded row.

Scrolling is implemented rather than stubbed. The body is mostly the edition
overview, which routinely overflows the popup, so empty scroll methods would
leave the arrow keys dead on the longest text in the view.

src/handlers/readarr_handlers/library/library_handler_tests.rs

@@ -14,7 +14,8 @@ mod tests {
   use crate::models::HorizontallyScrollableText;
   use crate::models::readarr_models::{Author, AuthorStatistics, AuthorStatus};
   use crate::models::servarr_data::readarr::readarr_data::{
-    AUTHOR_DETAILS_BLOCKS, ActiveReadarrBlock, BOOK_DETAILS_BLOCKS, LIBRARY_BLOCKS,
+    AUTHOR_DETAILS_BLOCKS, ActiveReadarrBlock, BOOK_DETAILS_BLOCKS, EDITION_DETAILS_BLOCKS,
+    LIBRARY_BLOCKS,
   };
   use crate::test_handler_delegation;
 
@@ -894,6 +895,7 @@ mod tests {
     library_handler_blocks.extend(LIBRARY_BLOCKS);
     library_handler_blocks.extend(AUTHOR_DETAILS_BLOCKS);
     library_handler_blocks.extend(BOOK_DETAILS_BLOCKS);
+    library_handler_blocks.extend(EDITION_DETAILS_BLOCKS);
 
     ActiveReadarrBlock::iter().for_each(|readarr_block| {
       if library_handler_blocks.contains(&readarr_block) {