feat(tui): Phase 3 power features — Who, Search, Timeline, Trace, File History screens

Complete TUI Phase 3 implementation with all 5 power feature screens:

- Who screen: 5 modes (expert/workload/reviews/active/overlap) with
  mode tabs, input bar, result rendering, and hint bar
- Search screen: full-text search with result list and scoring display
- Timeline screen: chronological event feed with time-relative display
- Trace screen: file provenance chains with expand/collapse, rename
  tracking, and linked issues/discussions
- File History screen: per-file MR timeline with rename chain display
  and discussion snippets

Also includes:
- Command palette overlay (fuzzy search)
- Bootstrap screen (initial sync flow)
- Action layer split from monolithic action.rs to per-screen modules
- Entity and render cache infrastructure
- Shared who_types module in core crate
- All screens wired into view/mod.rs dispatch
- 597 tests passing, clippy clean (pedantic + nursery), fmt clean

crates/lore-tui/src/state/mod.rs

@@ -13,8 +13,10 @@
 //! [`LoreApp`](crate::app::LoreApp) which dispatches through the
 //! [`TaskSupervisor`](crate::task_supervisor::TaskSupervisor).
 
+pub mod bootstrap;
 pub mod command_palette;
 pub mod dashboard;
+pub mod file_history;
 pub mod issue_detail;
 pub mod issue_list;
 pub mod mr_detail;
@@ -22,6 +24,7 @@ pub mod mr_list;
 pub mod search;
 pub mod sync;
 pub mod timeline;
+pub mod trace;
 pub mod who;
 
 use std::collections::{HashMap, HashSet};
@@ -29,8 +32,10 @@ use std::collections::{HashMap, HashSet};
 use crate::message::Screen;
 
 // Re-export screen states for convenience.
+pub use bootstrap::BootstrapState;
 pub use command_palette::CommandPaletteState;
 pub use dashboard::DashboardState;
+pub use file_history::FileHistoryState;
 pub use issue_detail::IssueDetailState;
 pub use issue_list::IssueListState;
 pub use mr_detail::MrDetailState;
@@ -38,6 +43,7 @@ pub use mr_list::MrListState;
 pub use search::SearchState;
 pub use sync::SyncState;
 pub use timeline::TimelineState;
+pub use trace::TraceState;
 pub use who::WhoState;
 
 // ---------------------------------------------------------------------------
@@ -163,6 +169,7 @@ pub struct ScopeContext {
 #[derive(Debug, Default)]
 pub struct AppState {
     // Per-screen states.
+    pub bootstrap: BootstrapState,
     pub dashboard: DashboardState,
     pub issue_list: IssueListState,
     pub issue_detail: IssueDetailState,
@@ -171,6 +178,8 @@ pub struct AppState {
     pub search: SearchState,
     pub timeline: TimelineState,
     pub who: WhoState,
+    pub trace: TraceState,
+    pub file_history: FileHistoryState,
     pub sync: SyncState,
     pub command_palette: CommandPaletteState,
 
@@ -205,6 +214,9 @@ impl AppState {
             || self.mr_list.filter_focused
             || self.search.query_focused
             || self.command_palette.query_focused
+            || self.who.has_text_focus()
+            || self.trace.has_text_focus()
+            || self.file_history.has_text_focus()
     }
 
     /// Remove focus from all text inputs.
@@ -213,6 +225,9 @@ impl AppState {
         self.mr_list.filter_focused = false;
         self.search.query_focused = false;
         self.command_palette.query_focused = false;
+        self.who.blur();
+        self.trace.blur();
+        self.file_history.blur();
     }
 }