- Introduce `IconMode` in core config (default Auto) and bump schema version to 1.4.0.
- Add `FileIconSet`, `IconDetection`, and `FileIconResolver` to resolve per‑file icons with configurable fallbacks and environment variable `OWLEN_TUI_ICONS`.
- Export resolver types from `owlen-tui::state::file_icons`.
- Extend `ChatApp` with `file_icons` field, initialize it from config, and expose via `file_icons()` accessor.
- Append system status line showing selected icon set and detection source.
- Implement breadcrumb construction (`repo > path > file`) and display in code pane headers.
- Render icons in file tree, handle unsaved file markers, hidden files, and Git decorations with proper styling.
- Add helper `collect_unsaved_relative_paths` and tree line computation for visual guides.
- Provide `Workspace::panes()` iterator for unsaved tracking.
- Update UI imports and tests to cover new breadcrumb feature.
- Export `PaletteGroup` and `PaletteSuggestion` to represent suggestion metadata.
- Implement command history with deduplication, capacity limit, and recent‑command suggestions.
- Enhance dynamic suggestion logic to include history, commands, models, and providers with fuzzy ranking.
- Add UI rendering for grouped suggestions, header with command palette label, and footer instructions.
- Update help text with new shortcuts (Ctrl+P, layout save/load) and expose new agent/layout commands.
Introduce `FileTreeState` for managing a navigable file hierarchy with Git decorations, filtering, and cursor/scroll handling.
Add `RepoSearchState` and related types to support asynchronous ripgrep‑backed repository searches, including result aggregation, pagination, and UI interaction.
- Introduce `ModelPaletteEntry` and re‑export it for external use.
- Extend `CommandPalette` with dynamic sources (models, providers) and methods to refresh suggestions based on `:model` and `:provider` prefixes.
- Implement fuzzy matching via `match_score` and subsequence checks for richer suggestion ranking.
- Add `provider` command spec and completions.
- Update UI to display “Model (Provider)” in the header and use the new active model label helper.
- Wire catalog updates throughout `ChatApp` (model palette entries, command palette refresh on state changes, model picker integration).
