feat: split the bar in two on DP-3

DP-3 is rotated, so a bar there is 1080px wide rather than 1920, and one bar
holding every module was too crowded. Status sits on top now, the desktop
itself along the bottom: workspaces on the left, open windows on the right.
Both bars are one waybar process reading one stylesheet, because waybar takes
a top-level array of bars, so the two cannot drift apart.

Presentation mode is the statusctl-backed module the DP-1 bar already runs,
rather than the wb-idle module written for this bar. It talks to files under
XDG_RUNTIME_DIR instead of to quickshell, so it keeps working while the shell
is down, and it already emits a state class, so the glyphs are simply dropped
and the icon chosen in CSS. wb-idle and its module are gone.

The module needs a format of one space. It defaults to "{text}", statusctl
emits an empty text, and waybar draws no widget at all for a custom module
whose formatted output is empty: not an empty pill, no pill. That is the same
trap the launcher hit, and it cost a wrong diagnosis on the way: a min-height
was added first on the theory that the pill was collapsing, which was treating
a symptom of a widget that did not exist. A forced red background proved it
was never drawn at all.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

1 files changed, 12 insertions, 5 deletions

diff --git a/SPEC.md b/SPEC.md
index c6a2fae..16a701b 100644
--- a/SPEC.md
+++ b/SPEC.md
@@ -23,9 +23,16 @@ pointed at DP-3.
 
 ## Layout
 
-    ┌ left ──────────────────────────────┐ ┌ center ┐ ┌ right ─────────────────────┐
-    [◆] [📅 Wed 15/09] [🕑 14:32] [1..8] [●●]  [ open apps ]  [🔊 62%] [tray] [⏻] [🇮🇹]
-     launcher  date      time  workspaces vm    taskbar        volume  tray present lang
+    top     [📅 Wed 15/09] [🕑 14:32] [●●]      [S]      [●] [🔊] [tray] [⏻] [🇮🇹]
+             date           time       vm     launcher  priv vol   tray present lang
+
+    bottom  [1..8]                                          [ open windows ]
+             workspaces                                       taskbar
+
+DP-3 is rotated, so a bar there is 1080px wide rather than 1920. One bar
+holding every module was too crowded at that width, so status sits on top and
+the desktop itself along the bottom. Both are one waybar process reading one
+stylesheet: waybar takes a top-level array of bars.
 
 Each bracket is one pill. Neighbouring pills in a cluster share a background
 and weld together with asymmetric corner radii; clusters are separated by
@@ -43,7 +50,7 @@ transparent gaps, so the bar reads as groups rather than a continuous strip.
 | center | `wlr/taskbar` | `icon-theme` config key | Per-window application icons. |
 | right | `group/wireplumber` | `image` module | Drawer group kept as it is today. |
 | right | `tray` | application-provided | |
-| right | `idle_inhibitor` | `image` module | Presentation mode. |
+| right | `custom/presentation` | CSS, keyed on the module's class | Presentation mode, the same `statusctl`-backed module the DP-1 bar runs. It already emits an empty text and a state class, so the icon is chosen in CSS and the glyphs are simply dropped. |
 | right | `image#lang` | `flag-it.svg` / `flag-gb.svg`, shipped here | An `image` module: `hyprland/language` styles as `#language` only, with no per-language class, so a flag cannot be selected in CSS. |
 
 Dropped from the current bar: `custom/breaktimer`, `custom/mail`,
@@ -128,7 +135,7 @@ Modular, one file per module, mirroring the current setup:
         tray.jsonc
         wireplumber.jsonc
       image/
-        idle_inhibitor.jsonc  presentation mode, via `image`
+        language.jsonc        the keyboard flag, via `image`
     styles/
       style.css               entry point, imports the rest in order
       theme.css               GENERATED by udt-palette, gitignored