tui: code-review Etap 1 — crash/injection/reconnect fixes + drop artifact renderer ...

Point fixes from the full TUI/terminal-client code review (docs/code_review_tui.md),
each with a covering test:

- command_palette: guard on_list_view_selected against IndexError when the
  filter is empty and the placeholder row is selected.
- cli /profile: read session_id (not the absent "id") from the server — the
  handler no longer KeyErrors.
- todo_list: escape task text/validation/index/milestone before interpolating
  into rich markup so a task like "fix [bug]" no longer breaks the line styling.
- builtin /help: drop bold markup tags from status content — StatusRenderer
  builds a literal Text() that would show the tags as literal square brackets.
- tui_app on_user_submitted: always enqueue when a bridge exists (the input loop
  buffers across reconnect) instead of dropping the message on connected=False.
- chat_model stream_start: also reset _current_thinking so a dropped turn (no
  thinking_end) does not glue the next turn's reasoning onto the old block.
- todo renderer update: coerce validation to str before .strip() so a non-string
  JSON value does not AttributeError.
- renderers: remove the unused ArtifactRenderer (no production path emits
  type=artifact — TUI shows files via the OS); keep the diff renderer test.

Full suite: 937 passed, 1 skipped.

permissions: remove broken client-side gate; add backend design doc ...

The terminal-TUI permission gate was a race: _execute_tools_with_sink
emits ToolStarted and starts the tool on the backend immediately, so by
the time the client dialog appeared the destructive action had already
run -- 'deny' could only stop the session, not un-execute the tool. It
also existed only in the terminal TUI (webclient/android had nothing),
and the system-prompt 'Strict Confirmation' nudge was an unreliable
duplicate.

Remove the broken machinery for a clean slate and plan the real
replacement from zero:

- delete clients/terminal/tui/permissions.py, screens/permission_dialog.py
  and their tests
- strip tui_app.py (engine, _deny_tool, _show_permission_dialog,
  _confirm_shell_command, _stop_session_worker, on_permission_request,
  tool_started gate) and the PermissionRequest TUI event; !cmd now runs
  directly (user-typed, no agent gate)
- drop the 'Strict Confirmation' prompt rule from navi_code/developer/
  tool_developer
- add docs/permissions.md: authoritative backend gate design (engine +
  registry + event + endpoint + agent gate + postgres policy + global
  rules config, sub-agents gated) -- design only, not yet implemented
- update docs/index.md, navi_code_cli.md, profiles.md, testing.md

Until Phase 1 lands there is no destructive-action confirmation -- a
conscious period without the false security of the old race-gate.

Navi Code TUI: unify session commands on shared workers; /switch hybrid ...

Route /new, /sessions, and /switch through shared app-side logic instead of
each command reimplementing the switch path:
- _open_sessions_picker(): pushes SessionsPickerScreen and wires the select
  callback to _switch_session_worker / _create_new_session_worker. Both
  /sessions and /switch (no/ambiguous arg) use it.
- /new -> _create_new_session_worker (was: inline create + attach + clear).
- /switch <prefix>: resolve to a single navi_code session (exact id, then
  prefix match) and switch directly via _switch_session_worker; no/ambiguous/
  unknown arg opens the picker pre-filtered to what was typed. This removes
  the latent clear()-after-attach bug from the old SwitchCommand (clear erased
  the history that attach_session had just replayed).
- SessionsPickerScreen gains initial_query to open pre-filtered.

Co-Authored-By: Claude <noreply@anthropic.com>

Navi Code TUI: sessions picker for /sessions (navi_code, full switch) ...

Replace the chat-printed session list with a modal picker:
- SessionsPickerScreen lists only navi_code-profile sessions (filtered by
  settings.default_profile_id), with a filter input, a top "✚ New session"
  row, and the current session marked. Up/Down + Enter to pick, Esc cancels.
- /sessions pushes the screen. Selecting an existing session runs
  _switch_session_worker (persist via StateManager + attach_session, which
  replays history and restarts the WS bridge — no chat_panel.clear() after,
  since load_history already replaces the chat and clearing would erase the
  replayed history). The "New session" row runs _create_new_session_worker.

Co-Authored-By: Claude <noreply@anthropic.com>

Navi Code TUI: fix input box layout, command palette duplicate IDs, status renderer, and WS input loop ...

- clients/terminal/tui/widgets/input_box.py: switch Horizontal to Vertical with width: 100% for Input so it renders and accepts input in real terminals; add refresh on Input.Changed.
- clients/terminal/tui/screens/command_palette.py: remove fixed ListItem IDs to avoid DuplicateIds on fast filter.
- clients/terminal/tui/chat_model.py + renderers/status.py + widgets/chat_panel.py: render backend status events as dim system messages instead of raw dicts.
- clients/terminal/tui/ws_bridge.py: start NaviWebSocketClient.input_loop so enqueued user messages are actually sent to the backend.
- clients/terminal/tui/tui_app.py: focus InputBox synchronously in on_mount so typing works immediately.
- tests/clients/test_tui_app.py: regression test for visible input text.

Co-Authored-By: Claude <noreply@anthropic.com>

Navi Code TUI: review fixes for Phase 5 ...

- Fix raw CLI session API fields (session_id/name/preview)

- Add --mouse/--no-mouse flags and persistent TUI settings coercion

- Make attach_session/apply_theme public, add ChatPanel.clear()

- Deduplicate session selection handlers and editor error handling

- Update docs and tests

Navi Code TUI: Phase 5.1 — config, mouse, themes, status ...

- Add TuiSettings persisted in ~/.navi_code/tui.json (theme, mouse, scroll_speed, diff_style, keybinds).
- TUI applies saved theme/mouse on startup; CLI gets --theme override.
- Add /themes picker with live preview and /mouse toggle command.
- Extend StatusPanel with backend URL, current theme, tokens/iter placeholders.
- Fix TuiContext.app() to use Textual active_app ContextVar.
- Add unit tests for settings, themes, and status panel.

513 passed, 1 skipped. Ruff clean.

Signed-off-by: Eugene Sukhodolskiy <eugene.sukhodolskiy@gmail.com>

Navi Code TUI: fix Phase 4 review critical/medium issues ...

- PermissionEngine: always-deny returns None via check(); is_always_deny() exposed for explicit rejection; default rules for code_exec/ssh_exec/shell; extract_target() made public.
- ShellRunner: set ShellResult.truncated when output is actually truncated.
- File refs: restrict paths to base_dir/home, block sensitive files/dirs, skip binary, support glob brackets, shared guess_language.
- Permission dialog: deny now renders synthetic tool_call before stopping; shell ! commands require permission with always-allow/deny persistence.
- Tests: add permission tests, fix file_refs/shell tests, add __init__.py to fix pytest name collisions, update websocket integration for AgentSessionOrchestrator.

504 passed, 1 skipped. Ruff clean.

Signed-off-by: Eugene Sukhodolskiy <eugene.sukhodolskiy@gmail.com>

Navi Code TUI: complete Phase 4 ...

- @ file references with glob/dir support and size limits
- ! shell commands with timeout and output truncation
- inline permission dialog for destructive tool calls
- diff and artifact renderers with theme-aware highlighting

Tests: 40 client tests passing

Navi Code TUI: command palette and themed markdown ...

- Add CommandPaletteScreen modal with fuzzy filtering and keyboard navigation.

- Bind Ctrl+P to push the palette; selected commands execute via registry.

- Make MarkdownRenderer theme-aware: headings, inline code, links, and code blocks use gnexus palette.

- Pick dracula/github-light code theme based on active theme brightness.

Co-Authored-By: Claude <noreply@anthropic.com>