Tighten TimeSpinner spacing and fix build warnings

Reduce gap between numbers and h/m unit labels in the workday
schedule spinners. Remove unused parse_hour function and fix
Svelte state_referenced_locally warning in BreakScreen.

src-tauri/src/timer.rs

@@ -462,14 +462,6 @@ pub enum IdleCheckResult {
     NaturalBreakDetected(u64), // duration in seconds
 }
 
-fn parse_hour(time_str: &str) -> u32 {
-    time_str
-        .split(':')
-        .next()
-        .and_then(|h| h.parse().ok())
-        .unwrap_or(9)
-}
-
 /// Returns the number of seconds since last user input (mouse/keyboard).
 #[cfg(windows)]
 pub fn get_idle_seconds() -> u64 {