fix: address reviewer feedback — rename scroll field to bool, relocate static, drop env var

- Rename `ui_scroll_tick_count: u64` → `should_text_scroll: bool` across all 33
  call sites; `on_ui_scroll_tick` now assigns true/false instead of 0/1
- Remove two now-redundant comments from `test_on_ui_scroll_tick`
- Move `WHITESPACE_RE` static declaration below module imports in network/mod.rs
- Remove `MANAGARR_TICK_RATE_MS` env var and its parsing helpers; `recv()`-based
  blocking already brings idle CPU to near-0, and tuning tick rate silently
  stretches the poll cadence — keep `DEFAULT_TICK_RATE_MS` const only

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01C3FpbniZme9mJqgFkMVowz

src/ui/radarr_ui/collections/collection_details_ui.rs

@@ -90,7 +90,7 @@ pub fn draw_collection_details(f: &mut Frame<'_>, app: &mut App<'_>, area: Rect)
     movie.title.scroll_left_or_reset(
       get_width_from_percentage(table_area, 20),
       current_selection == *movie,
-      app.ui_scroll_tick_count == 0,
+      app.should_text_scroll,
     );
     let (hours, minutes) = convert_runtime(movie.runtime);
     let imdb_rating = movie