Add window levels, status bar, UTF-8 input, charset conversion

- Isolated window levels with 500-line scrollback per window
  - Window 1: status + private messages
  - Windows 2-9: channels
- Status bar showing window, channel, nick prefix, channel modes
- Automatic charset conversion (UTF-8/UTF-16 -> ISO-8859-1 on wire)
- UTF-8 aware input editing with Ctrl-A/E/U/K/Y
- CTCP VERSION reply with real OS info from uname()
- Real name from passwd GECOS field
- SIGWINCH handling for terminal resize
- Ctrl-C quit confirmation (y + Enter)
- /whois, /wii, /mode, /quit with default reason
- Green prompt, timestamps on all messages

README.md

@@ -6,9 +6,8 @@ A lightweight terminal IRC client written in C with automatic charset conversion
 
 - **Automatic charset conversion** — detects UTF-8, UTF-16 (BOM), and ISO-8859-1 input; always sends ISO-8859-1 on the wire
 - **Window levels** — isolated windows with independent 500-line scrollback:
-  - Window 1: Status (server messages, numerics, notices)
-  - Window 2: Private messages
-  - Windows 3–9: Channels
+  - Window 1: Status and private messages
+  - Windows 2–9: Channels
 - **Status bar** — shows current window, channel, nick prefix (@/+), and channel modes
 - **UTF-8 terminal support** — full multi-byte input editing
 - **CTCP VERSION** reply with OS info
@@ -63,10 +62,10 @@ Typing text without a `/` prefix sends to the channel on the current window.
 
 ## Window Workflow
 
-1. Press ESC+3 to switch to window 3
+1. Press ESC+2 to switch to window 2
 2. `/join #channel` — the channel is bound to that window
-3. Press ESC+4, `/join #other` — second channel on window 4
-4. ESC+1 to check status, ESC+2 for private messages
+3. Press ESC+3, `/join #other` — second channel on window 3
+4. ESC+1 to check status and private messages
 
 Each window maintains its own scrollback. Switching redraws the full history.