feat: Use eye-declare for more performant and flexible AI TUI (#3343)

This PR replaces the mess of custom rendering code in Atuin AI with
[eye-declare](https://github.com/BinaryMuse/eye-declare), and updates
the TUI to feel more terminal-native: output appears inline and persists
in scrollback, so you can scroll up and look at previous conversations
for reference.

The "review" state — which used to exist between the LLM generating a
response and the user either executing or following up — has been
removed; just start typing to follow up with the LLM, or press `enter`
at the empty input box to execute the suggested command.

<img width="1203" height="633" alt="image"
src="https://github.com/user-attachments/assets/159ee447-9a2a-4edd-b56e-a79bf1aaaa94"
/>

1 files changed, 27 insertions, 0 deletions

diff --git a/crates/atuin-ai/src/tui/events.rs b/crates/atuin-ai/src/tui/events.rs
new file mode 100644
index 00000000..a791bb80
--- /dev/null
+++ b/crates/atuin-ai/src/tui/events.rs
@@ -0,0 +1,27 @@
+/// Application-domain events emitted by UI components.
+///
+/// Components translate raw key events into these semantic events,
+/// which are sent via an `mpsc::Sender<AiTuiEvent>` provided through
+/// eye-declare's context system. The main event loop in `inline.rs`
+/// receives them and mutates `AppState` accordingly.
+#[derive(Debug)]
+pub enum AiTuiEvent {
+    /// User updated the input text
+    InputUpdated(String),
+    /// User submitted text input (Enter in Input mode)
+    SubmitInput(String),
+    /// User entered a slash command (e.g. "/help")
+    SlashCommand(String),
+    /// Cancel active generation or streaming (Esc during Generating/Streaming)
+    CancelGeneration,
+    /// Execute the suggested command
+    ExecuteCommand,
+    /// Insert command without executing
+    InsertCommand,
+    /// Cancel confirmation of dangerous command
+    CancelConfirmation,
+    /// Retry after error
+    Retry,
+    /// Exit the application
+    Exit,
+}