feat: Use eye-declare for more performant and flexible TUI

[BinaryMuse]

This PR replaces the mess of custom rendering code in Atuin AI with 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.

[ellie]

dude I love this so much, let's go!

[greptile-apps]

Greptile Summary

This PR replaces Atuin AI's custom rendering stack with eye-declare, moving to an inline terminal-native TUI where conversation output persists in scrollback. The "review" state is removed — users type to follow up or press Enter on an empty input to execute the suggested command.

Key issues found:

• on_commit event eviction is too granular: events are removed one at a time as content scrolls into scrollback, but events_to_messages() requires them to stay in semantically valid pairs/turns. A single eviction can leave an assistant Text event as the first entry, producing an invalid conversation (assistant-first) sent to the API on follow-up.
• --keep flag is a silent no-op: the flag is visible in --help output but the underlying functionality was removed; the parameter is just prefixed with _ in inline::run.
• Stale doc comments in events.rs still reference the removed "Review mode".

Important Files Changed

Filename	Overview
crates/atuin-ai/src/commands/inline.rs	Full TUI rewrite using eye-declare; has two issues: on_commit evicts events one-at-a-time (breaks conversation pair integrity), and --keep flag is silently ignored despite being visible in --help
crates/atuin-ai/src/commands.rs	Removes debug_render command; --keep flag is still advertised in help but has no effect in the new implementation
crates/atuin-ai/src/tui/events.rs	Semantic event enum; doc comments reference the removed "Review mode" in three places
crates/atuin-ai/src/tui/state.rs	Domain state types; well-structured with clear lifecycle methods; no issues found
crates/atuin-ai/src/tui/view/mod.rs	New eye-declare view function; clean declarative layout with proper handling of all turn types
crates/atuin-ai/src/tui/view/turn.rs	TurnBuilder converts conversation events to UI turns; graceful fallback for unknown danger/confidence values (no panics)
crates/atuin-ai/src/tui/components/input_box.rs	Bordered tui-textarea wrapper; correctly bubbles Esc/Tab/Ctrl+C and handles paste events
crates/atuin-ai/src/tui/components/atuin_ai.rs	Top-level key event translator; correctly maps mode-specific keys to semantic AiTuiEvents

_{Reviews (2): Last reviewed commit: "Cleanup" | Re-trigger Greptile}

[BinaryMuse]

@greptileai

[ellie]