show names on tabs in tabbed layout

README.md

@@ -189,9 +189,12 @@ order — the first master slot — and takes focus, as in dwm. A window spawned
 onto a tag nobody is viewing leaves both the order and focus alone.
 
 **tabbed** — same geometry as monocle, minus a strip at the top where att_wm
-draws one solid colour block per window, the focused one highlighted. The blocks
-are clickable. Titles are *not* drawn — that would mean a font stack — but the
-window list is published over IPC, so a bar can draw a textual tab strip
+draws one tab per window, the focused one highlighted. Each tab is clickable and
+carries the window's title, elided with an ellipsis when the tab is too narrow.
+Titles are drawn in a 5x8 bitmap font built into the binary (`src/font.zig`) —
+a font stack for one strip of pixels would be a poor trade — scaled by whole
+pixels to suit `tabbar_height`, or by `tab_font_scale` if you would rather say.
+The same window list is published over IPC, so a bar can draw its own tab strip
 alongside (the bundled quickshell config does). Set `tabbar_height = 0` to drop
 the built-in strip entirely and let the bar own it.
 
@@ -217,9 +220,10 @@ zig build -Dconfig=/path/to/my-config.zig
 att_wm.override { configFile = ./my-config.zig; }
 ```
 
-`config.zig` covers border width and colours, gaps, tab bar height and colours,
-the default layout, `nmaster` / `mfact`, tag names, focus-follows-mouse, key and
-pointer bindings, autostart commands, input devices, and window rules:
+`config.zig` covers border width and colours, gaps, tab bar height, colours and
+text size, the default layout, `nmaster` / `mfact`, tag names,
+focus-follows-mouse, key and pointer bindings, autostart commands, input
+devices, and window rules:
 
 ```zig
 pub const rules = [_]Rule{
@@ -487,7 +491,8 @@ river's identifier is shared between them.
 | `src/input.zig` | Input configuration types — no Wayland, unit tested |
 | `src/config.zig` | Compile-time configuration |
 | `src/ipc.zig` | Socket server and JSON encoding |
-| `src/shm.zig` | memfd buffers for the tab bar |
+| `src/shm.zig` | memfd buffers for the tab bar, and drawing into them |
+| `src/font.zig` | The built-in 5x8 bitmap font — no Wayland, unit tested |
 | `src/sys.zig` | Thin Linux syscall wrappers |
 
 The single most important invariant: **river only permits window management