docs(tui): keybindings audit + source-of-truth catalog (#559)

Walks every key handler in `crates/tui/src/tui/ui.rs` and
`crates/tui/src/tui/app.rs`, confirms each chord resolves to a live
action, and groups them by context (global, composer, transcript,
sidebar, palette, approval modal, onboarding) so users have a single
page to point at instead of guessing from the help overlay.

Audit findings inline at the bottom of the doc:
* No broken bindings: every chord resolves to a live handler.
* `Ctrl-P` was previously double-bound (history + palette); that's
  reconciled — the palette opens via `Ctrl-K`, `Ctrl-P` keeps history.
* The `?` help overlay entries all correspond to bindings in the
  catalog; aspirational ones were either implemented this release or
  dropped.

Deferral note for #436 (configurable keymap) and #437 (separate
`tui.toml`): both need a named-binding registry that names every chord
on this page and lets a user file override individual entries with
conflict detection. Half-implementing that in a patch release is worse
than landing the spec first; v0.8.10 ships the spec, the registry
follows in v0.8.11.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Hunter Bown
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# Keybindings
This is the source-of-truth catalog of every keyboard shortcut the TUI recognizes. Bindings are grouped by **context** — the focus or modal state they fire in. A binding listed under "Composer" only takes effect when the composer is focused; one under "Transcript" only when the transcript has focus; and so on.
Bindings are not (yet) user-configurable — that's tracked as a v0.8.11 follow-up (#436, #437). This document is the contract that future config-file overrides will name into.
## Global (any context)
| Chord | Action |
|----------------------|---------------------------------------------------------------|
| `F1` or `Ctrl-?` | Toggle the help overlay |
| `Ctrl-K` | Open the command palette (slash-command finder) |
| `Ctrl-C` | Cancel current turn / dismiss modal / arm-then-confirm quit |
| `Ctrl-D` | Quit (only when the composer is empty) |
| `Tab` | Cycle TUI mode: Plan → Agent → YOLO → Plan |
| `Shift-Tab` | Cycle reasoning effort: off → high → max → off |
| `Ctrl-R` | Open the resume-session picker |
| `Ctrl-L` | Refresh / clear the screen |
| `Ctrl-T` | Toggle the file-tree sidebar |
| `Esc` | Close topmost modal · cancel slash menu · dismiss toast |
## Composer
Editing the message you're about to send.
| Chord | Action |
|-----------------------------|---------------------------------------------------------|
| `Enter` | Send the message (or run the slash command) |
| `Alt-Enter` / `Ctrl-J` | Insert a newline without sending |
| `Ctrl-U` | Delete to start of line |
| `Ctrl-W` | Delete previous word |
| `Ctrl-A` / `Home` | Move to start of line |
| `Ctrl-E` / `End` | Move to end of line |
| `Ctrl-←` / `Alt-←` | Move backward one word |
| `Ctrl-→` / `Alt-→` | Move forward one word |
| `Ctrl-V` / `Cmd-V` | Paste from clipboard (also bracketed-paste auto-handled)|
| `Ctrl-Y` | Yank (paste) from kill buffer |
| `↑` / `↓` | Cycle composer history (when composer is empty / at top) |
| `Ctrl-P` / `Ctrl-N` | Cycle composer history (alternative) |
| `Ctrl-S` | Reverse history search (Ctrl-S to advance, Esc to exit) |
| `Tab` | Slash-command / `@`-mention completion (popup-aware) |
| `Ctrl-O` | Open external editor for the composer draft |
### `@` mentions
Type `@<partial>` to open the file mention popup. `↑`/`↓` cycle the entries, `Tab` or `Enter` accepts. `Esc` hides the popup. As of v0.8.10 (#441), completions are re-ranked by mention frecency — files you mention often + recently float to the top.
### `#` quick-add (memory)
When `[memory] enabled = true`, typing `# foo` and pressing `Enter` appends `foo` as a timestamped bullet to your memory file *without* sending a turn. See `docs/MEMORY.md`.
## Transcript (when transcript has focus)
| Chord | Action |
|----------------------|-----------------------------------------------------|
| `↑` / `↓` / `j` / `k`| Scroll one line |
| `PgUp` / `PgDn` | Scroll one page |
| `Home` / `g` | Jump to top |
| `End` / `G` | Jump to bottom |
| `Esc` | Return focus to composer |
| `y` | Yank selected region to clipboard |
| `v` | Begin / extend visual selection |
| `o` | Open URL under cursor (OSC 8 capable terminals) |
## Sidebar (when sidebar has focus)
| Chord | Action |
|----------------------|-----------------------------------------------------|
| `↑` / `↓` / `j` / `k`| Move selection |
| `Enter` | Activate the selected item (open / focus / cancel) |
| `Tab` | Cycle to next sidebar panel (Files → Tasks → Agents → Todos) |
| `Esc` | Return focus to composer |
## Slash-command palette (after `Ctrl-K` or typing `/`)
| Chord | Action |
|----------------------|-----------------------------------------------------|
| `↑` / `↓` | Move selection |
| `Enter` / `Tab` | Run / complete the highlighted command |
| `Esc` | Dismiss palette |
## Approval modal (when a tool requests approval)
| Chord | Action |
|----------------------|-----------------------------------------------------|
| `y` / `Y` | Approve once |
| `a` / `A` | Approve all (auto-approve subsequent calls) |
| `n` / `N` / `Esc` | Deny |
| `e` | Edit the approved input before running |
## Onboarding (first-run flow)
| Chord | Action |
|----------------------|-----------------------------------------------------|
| `Enter` | Advance to next step (Welcome → Language → API → …) |
| `Esc` | Step back one screen |
| `1``5` | Pick a language (Language step) |
| `y` / `Y` | Trust the workspace (Trust step) |
| `n` / `N` | Skip the trust prompt |
## v0.8.10 audit notes
- **No broken bindings found.** Every chord listed above resolves to a live handler in `crates/tui/src/tui/ui.rs` (key-event dispatch) or `crates/tui/src/tui/app.rs` (mode + state transitions).
- **Conflicts deduped.** `Ctrl-P` was previously double-bound (history + palette open); the palette opens via `Ctrl-K` only, leaving `Ctrl-P` for history.
- **Help overlay reconciled.** Every entry shown in the `?` help overlay corresponds to a binding in this doc; entries that were aspirational were either implemented (logged in this release) or dropped.
- **Configurable keymap (#436) and `tui.toml` (#437) are deferred to v0.8.11.** That work needs a named-binding registry that names every chord on this page and lets `~/.deepseek/keybinds.toml` override individual entries with conflict detection. Doing it well is bigger than a patch release; doing it sloppily would land a half-finished registry that future contributors have to navigate around. v0.8.10 ships with this audit + docs as the durable spec the registry will name into.