feat(tui): wire entity cache for near-instant detail view reopens (bd-3rjw)

- Add get_mut() and clear() methods to EntityCache<V>
- Add CachedIssuePayload / CachedMrPayload types to state
- Wire cache check in navigate_to for instant cache hits
- Populate cache on IssueDetailLoaded / MrDetailLoaded
- Update cache on DiscussionsLoaded
- Add 6 new entity_cache tests (get_mut, clear)

crates/lore-tui/src/view/file_history.rs

@@ -371,7 +371,11 @@ fn render_mr_list(
 
     // Inline discussion snippets (rendered beneath MRs when toggled on).
     if state.show_discussions && !result.discussions.is_empty() {
-        let visible_mrs = result.merge_requests.len().saturating_sub(offset).min(height);
+        let visible_mrs = result
+            .merge_requests
+            .len()
+            .saturating_sub(offset)
+            .min(height);
         let disc_start_y = start_y + visible_mrs as u16;
         let remaining = height.saturating_sub(visible_mrs);
         render_discussions(frame, result, x, disc_start_y, max_x, remaining, bp);

crates/lore-tui/src/view/issue_detail.rs

@@ -113,9 +113,7 @@ pub fn render_issue_detail(
     y = render_metadata_row(frame, meta, bp, area.x, y, max_x);
 
     // --- Optional milestone / due date row (skip on Xs — too narrow) ---
-    if !matches!(bp, Breakpoint::Xs)
-        && (meta.milestone.is_some() || meta.due_date.is_some())
-    {
+    if !matches!(bp, Breakpoint::Xs) && (meta.milestone.is_some() || meta.due_date.is_some()) {
         y = render_milestone_row(frame, meta, area.x, y, max_x);
     }
 
@@ -136,7 +134,8 @@ pub fn render_issue_detail(
     let xref_count = state.cross_refs.len();
 
     let wide = detail_side_panel(bp);
-    let (desc_h, disc_h, xref_h) = allocate_sections(remaining, desc_lines, disc_count, xref_count, wide);
+    let (desc_h, disc_h, xref_h) =
+        allocate_sections(remaining, desc_lines, disc_count, xref_count, wide);
 
     // --- Description section ---
     if desc_h > 0 {
@@ -629,7 +628,10 @@ mod tests {
     fn test_allocate_sections_wide_gives_more_description() {
         let (d_narrow, _, _) = allocate_sections(20, 10, 3, 2, false);
         let (d_wide, _, _) = allocate_sections(20, 10, 3, 2, true);
-        assert!(d_wide >= d_narrow, "wide should give desc at least as much space");
+        assert!(
+            d_wide >= d_narrow,
+            "wide should give desc at least as much space"
+        );
     }
 
     #[test]

crates/lore-tui/src/view/search.rs

@@ -102,7 +102,15 @@ pub fn render_search(frame: &mut Frame<'_>, state: &SearchState, area: Rect) {
     if state.results.is_empty() {
         render_empty_state(frame, state, area.x + 1, y, max_x);
     } else {
-        render_result_list(frame, state, area.x, y, area.width, list_height, show_project);
+        render_result_list(
+            frame,
+            state,
+            area.x,
+            y,
+            area.width,
+            list_height,
+            show_project,
+        );
     }
 
     // -- Bottom hint bar -----------------------------------------------------

crates/lore-tui/src/view/sync.rs

@@ -115,10 +115,7 @@ fn render_running(frame: &mut Frame<'_>, state: &SyncState, area: Rect) {
     let bar_start_y = area.y + 4;
     let label_width = 14u16; // "Discussions  " is the longest
     let bar_x = area.x + 2 + label_width;
-    let bar_width = area
-        .width
-        .saturating_sub(4 + label_width + 12)
-        .min(max_bar); // Cap bar width for very wide terminals
+    let bar_width = area.width.saturating_sub(4 + label_width + 12).min(max_bar); // Cap bar width for very wide terminals
 
     for (i, lane) in SyncLane::ALL.iter().enumerate() {
         let y = bar_start_y + i as u16;

crates/lore-tui/src/view/timeline.rs

@@ -124,7 +124,16 @@ pub fn render_timeline(
     } else {
         let bp = classify_width(area.width);
         let time_col_width = timeline_time_width(bp);
-        render_event_list(frame, state, area.x, y, area.width, list_height, clock, time_col_width);
+        render_event_list(
+            frame,
+            state,
+            area.x,
+            y,
+            area.width,
+            list_height,
+            clock,
+            time_col_width,
+        );
     }
 
     // -- Hint bar --

crates/lore-tui/src/view/who.rs

@@ -226,13 +226,7 @@ fn render_input_bar(
                     .get(cursor_pos..)
                     .and_then(|s| s.chars().next())
                     .unwrap_or(' ');
-                frame.print_text_clipped(
-                    cursor_x,
-                    y,
-                    &cursor_char.to_string(),
-                    cursor_cell,
-                    max_x,
-                );
+                frame.print_text_clipped(cursor_x, y, &cursor_char.to_string(), cursor_cell, max_x);
             }
         }
     }