simplify. remove tick

CLAUDE.md

@@ -38,7 +38,7 @@ View (hiccup) → Render (ANSI string) → Terminal (raw mode I/O)
 
 ### Core Modules
 
-- **tui.core** - Main runtime with core.async. Manages the event loop, executes commands (quit, tick, batch, seq), handles input via goroutines.
+- **tui.core** - Main runtime with core.async. Manages the event loop, executes commands (quit, after, batch, seq), handles input via goroutines.
 - **tui.render** - Converts hiccup (`[:col [:text "hi"]]`) to ANSI strings. Handles `:text`, `:row`, `:col`, `:box`, `:space` elements.
 - **tui.terminal** - Platform abstraction: raw mode via `stty`, reads from `/dev/tty`, renders by printing ANSI.
 - **tui.input** - Parses raw bytes into key messages (`[:key {:char \a}]`, `[:key :up]`, `[:key {:ctrl true :char \c}]`).
@@ -56,7 +56,7 @@ View (hiccup) → Render (ANSI string) → Terminal (raw mode I/O)
 ### Command Types
 
 - `tui/quit` - Exit
-- `(tui/tick ms)` - Send `:tick` after delay
+- `(tui/after ms msg)` - Send `msg` after delay (for timers, animations)
 - `(tui/batch cmd1 cmd2)` - Parallel execution
 - `(tui/sequentially cmd1 cmd2)` - Sequential execution
 - `(fn [] msg)` - Custom async returning a message