refactor: table-style display with live spinner (🔄→✅/❌)

- Remove \t-based alignment (fixes emoji spacing inconsistencies)
- New display.rs module: table rows with dynamic terminal-width columns
- Columns: action_emoji | name (14ch) | payload (55%) | status_emoji | result (45%)
- cmd_start() prints 🔄 spinner, cmd_done() overwrites line in-place via ANSI cursor-up
- Payload and result truncated to column width with ellipsis
- Consistent 2-space gaps after every emoji (no tab stops)
- Add terminal_size crate for dynamic width (fallback: 120)

crates/client/Cargo.toml

@@ -24,6 +24,7 @@ base64 = "0.22"
 png = "0.17"
 futures-util = "0.3"
 colored = "2"
+terminal_size = "0.3"
 
 [build-dependencies]
 winres = "0.1"