ublx 0.1.0

TUI to index once, enrich with metadata, and browse a flat snapshot in a 3-pane layout with multiple modes.
Documentation 
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# Handlers

Handler logic for the TUI: input → state transitions, loading data, and calling into engine/render.

Indexer and Zahir integration (opts, batch/stream runs, delimiter helpers) live in **`crate::integrations`** (`nefax_ops`, `zahir_ops`) — see `src/integrations/`.

## Layout

| Module                | Purpose                                                                                                                                                                         |
| --------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **core**              | `run_app` (headless snapshot, headless Zahir JSON export, or TUI) / `run_tui_session` (alternate screen + [`main_loop`](../app/mod.rs) + teardown). Config watcher on TUI path. |
| **state_transitions** | Map key events to state changes (navigation, search, mode switch, open menu, lens menu, etc.).                                                                                  |
| **viewing**           | Resolve right-pane content: file preview, tree for dirs, zahir JSON → templates/metadata/writing. `resolve_right_pane_content`.                                                 |
| **snapshot_pipeline** | Snapshot run (nefax + zahir, write to DB, toast). Used when user triggers “Take snapshot”.                                                                                      |