refactor(theme): read the palette from unified-desktop-theme

Both components had their own copy of the Macchiato colours, and the
second copy appeared the moment there was a second component. Editing the
palette meant editing it in as many places as there were shells, and they
would have drifted.

They now read ~/.cache/wal/udt-palette.qml, which udt-accent generates
from unified-desktop-theme's palette.rasi. The file is watched, so a
palette change reaches a running shell in place, the same way the accent
already did.

What is left in Theme.qml is a fallback, used before the file has been
read and on a machine where unified-desktop-theme is not installed, which
is what keeps each directory runnable on its own.

The file is parsed rather than imported: a generated QML singleton cannot
be imported without a qmldir beside it, and the wal cache has no reason
to carry one.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01G7NRsGyF9jGfPYS4zPqpN7

2 files changed, 37 insertions, 18 deletions

diff --git a/vm-manager/README.md b/vm-manager/README.md
index e11b7f2..1bc20ef 100644
--- a/vm-manager/README.md
+++ b/vm-manager/README.md
@@ -82,9 +82,11 @@ nowhere to go: the process output is not attached to a terminal.
 
 ## Theme
 
-`Theme.qml` is the copy from `volume-osd` with three colours added for state
-dots (green running, yellow transitional, red crashed). The accent still comes
-from `~/.cache/wal/udt-accent.rasi` and still tracks the wallpaper.
+`Theme.qml` carries only fallbacks. The palette comes from
+`~/.cache/wal/udt-palette.qml`, generated by `udt-accent` from
+unified-desktop-theme's `palette.rasi`, and is watched: editing the palette
+there recolours a running drawer without restarting it. State dots use the
+green, yellow and red from that palette.
 
 The frosting is Hyprland's, matched on this window's namespace:
 
diff --git a/vm-manager/Theme.qml b/vm-manager/Theme.qml
index 714e289..bddfe7d 100644
--- a/vm-manager/Theme.qml
+++ b/vm-manager/Theme.qml
@@ -15,33 +15,50 @@ import Quickshell
 import Quickshell.Io
 import QtQuick
 
+// The palette comes from unified-desktop-theme: udt-accent writes
+// ~/.cache/wal/udt-palette.qml on every wallpaper change, holding the
+// Macchiato colours from its palette.rasi plus the accent snapped from the
+// wallpaper. Watching that file is what makes a theme edit show up here.
+//
+// The defaults below are only what renders before the file is read, or on a
+// machine where unified-desktop-theme is not installed.
 Singleton {
     id: root
 
-    // Catppuccin Macchiato. Fixed, same base as unified-desktop-theme.
-    readonly property color base: "#24273a"
-    readonly property color surface: "#363a4f"
-    readonly property color text: "#cad3f5"
-    readonly property color subtext: "#a5adcb"
-    readonly property color red: "#ed8796"
-    readonly property color green: "#a6da95"
-    readonly property color yellow: "#eed49f"
-    readonly property color overlay: "#6e738d"
-
-    // Tracks the wallpaper, like rofi and dunst do. Lavender until read.
+    property color base: "#24273a"
+    property color surface: "#363a4f"
+    property color text: "#cad3f5"
+    property color subtext: "#a5adcb"
+    property color red: "#ed8796"
+    property color green: "#a6da95"
+    property color yellow: "#eed49f"
+    property color overlay: "#6e738d"
     property color accent: "#b7bdf8"
 
     readonly property string fontFamily: "Noto Sans"
     readonly property int fontSize: 16
 
-    // udt-accent writes one line: `* { accent: #rrggbbaa; }`
+    // Parsed rather than imported: a generated file cannot be a QML import
+    // without a qmldir next to it, and the cache directory has no reason to
+    // carry one. The format is fixed and machine-written, so a regex is enough.
     FileView {
-        path: `${Quickshell.env("HOME")}/.cache/wal/udt-accent.rasi`
+        path: `${Quickshell.env("HOME")}/.cache/wal/udt-palette.qml`
         watchChanges: true
         onFileChanged: reload()
         onLoaded: {
-            const m = text().match(/accent:\s*(#[0-9a-fA-F]{6})/);
-            if (m) root.accent = m[1];
+            const pick = key => {
+                const m = text().match(new RegExp(`property color ${key}: "(#[0-9a-fA-F]{6})"`));
+                return m ? m[1] : null;
+            };
+            root.base    = pick("base")     ?? root.base;
+            root.surface = pick("surface0") ?? root.surface;
+            root.text    = pick("text")     ?? root.text;
+            root.subtext = pick("subtext0") ?? root.subtext;
+            root.red     = pick("red")      ?? root.red;
+            root.green   = pick("green")    ?? root.green;
+            root.yellow  = pick("yellow")   ?? root.yellow;
+            root.overlay = pick("overlay0") ?? root.overlay;
+            root.accent  = pick("accent")   ?? root.accent;
         }
     }
 }