feat: TUI Phase 1 common widgets + scoring/path beads

bd-26f2: Common widgets (render_breadcrumb, render_status_bar,
render_loading, render_error_toast, render_help_overlay) + render_screen
top-level dispatch wired to LoreApp::view(). 27 widget tests.

bd-2w1p: Add half-life fields to ScoringConfig with validation.
bd-1soz: Add half_life_decay() pure function.
bd-18dn: Add normalize_query_path() for path canonicalization.

Phase 1 modules: CommandRegistry, NavigationStack, CrashContext,
TaskSupervisor, AppState with per-screen states.

172 lore-tui tests passing, clippy clean, fmt clean.

crates/lore-tui/Cargo.lock

@@ -1335,6 +1335,9 @@ dependencies = [
  "lore",
  "regex",
  "rusqlite",
+ "serde",
+ "serde_json",
+ "tempfile",
 ]
 
 [[package]]