style: format seluruh workspace dengan cargo fmt

Menyeragamkan format kode sesuai rustfmt (126 file). Sebelumnya
lefthook pre-commit 'cargo fmt --check' akan gagal pada commit apa pun.

apps/interfaces/tui/src/view/overlays/usage.rs

@@ -31,7 +31,12 @@ pub fn render(
     let summary = runtime.map(|r| compute_usage_summary(&r.usage, r.session_start, now_ms));
     let (edit_count, lesson_count, review_count, consec_empty) =
         runtime.map_or((0, 0, 0, 0), |r| {
-            (r.edit_count, r.lessons.total, r.review_count, r.consecutive_empty_reviews)
+            (
+                r.edit_count,
+                r.lessons.total,
+                r.review_count,
+                r.consecutive_empty_reviews,
+            )
         });
     let mut lines = vec![
         Line::from(Span::styled(
@@ -88,12 +93,19 @@ pub fn render(
     )));
     lines.push(Line::from(Span::styled(
         format!("  Empty reviews:  {consec_empty}"),
-        Style::default().fg(if consec_empty > 3 { Theme::WARNING } else { Theme::TEXT_DIM }),
+        Style::default().fg(if consec_empty > 3 {
+            Theme::WARNING
+        } else {
+            Theme::TEXT_DIM
+        }),
     )));
     if let Some(s) = &summary {
         lines.push(Line::from(Span::raw("")));
         lines.push(Line::from(Span::styled(
-            format!("  Session: {}h {}m {}s", s.elapsed_hours, s.elapsed_minutes, s.elapsed_seconds),
+            format!(
+                "  Session: {}h {}m {}s",
+                s.elapsed_hours, s.elapsed_minutes, s.elapsed_seconds
+            ),
             Style::default().fg(Theme::TEXT_DIM),
         )));
     }