review(p9-fb-14): 회차 1 nit 반영

- ask.rs `push_turn_lines` Q label: `Role::Heading + add_modifier(BOLD)`
  의 BOLD 가 중복 (Role::Heading 이 양 팔레트 모두 BOLD 포함). 제거 +
  주석으로 \"Heading 은 이미 BOLD\" 명시.
- run.rs `render_ingest_status` aborted 분기: `Role::Title` (= White +
  BOLD) 보다 `Role::Warning` (Yellow) 이 \"비정상 종료\" 의미와 정렬.
  BOLD 는 명시적으로 add_modifier 하여 라이브 진행 라인과의 대비 유지.
- theme.rs `impl Default for Theme` 위에 doc comment 추가 — `default()
  == dark()` invariant 와 `default_palette_is_dark` 테스트가 묶여
  있음을 명시.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/kebab-tui/src/ask.rs

@@ -153,12 +153,10 @@ fn push_turn_lines(
     let q_label = format!("Q{}", idx + 1);
     let a_label = format!("A{}", idx + 1);
     out.push(Line::from(vec![
-        Span::styled(
-            q_label,
-            theme
-                .style(crate::theme::Role::Heading)
-                .add_modifier(Modifier::BOLD),
-        ),
+        // `Role::Heading` already includes BOLD in both palettes, so
+        // no need to `add_modifier(BOLD)` here — the redundancy would
+        // imply Heading lacks BOLD elsewhere.
+        Span::styled(q_label, theme.style(crate::theme::Role::Heading)),
         Span::raw(": "),
         Span::raw(question.to_string()),
     ]));

crates/kebab-tui/src/run.rs

@@ -247,8 +247,14 @@ fn render_ingest_status(f: &mut Frame, area: Rect, app: &App) {
         return;
     };
     let line = crate::ingest_progress::status_line(state);
+    // p9-fb-14: `aborted` is a non-fatal-but-noteworthy state (Ctrl-C
+    // partial commit) — `Role::Warning` (yellow) is the right semantic
+    // signal, plus an explicit BOLD so the abort line still stands
+    // out from the live progress lines around it.
     let style = if state.aborted {
-        app.theme.style(crate::theme::Role::Title)
+        app.theme
+            .style(crate::theme::Role::Warning)
+            .add_modifier(ratatui::style::Modifier::BOLD)
     } else {
         app.theme.style(crate::theme::Role::Body)
     };

crates/kebab-tui/src/theme.rs

@@ -128,6 +128,10 @@ impl Theme {
     }
 }
 
+/// `Theme::default() == Theme::dark()` — pinned by
+/// `default_palette_is_dark` test. If the default ever flips, both
+/// the test and downstream callers (e.g. integration smokes that
+/// rely on dark contrast) need a coordinated update.
 impl Default for Theme {
     fn default() -> Self {
         Self::dark()