refactor(quickshell): move every color and font into a Theme singleton

The shell was running two unrelated palettes: an amber one (#FFD063 accent,
#EEEEEE text, #0F1012 panels) hardcoded as ~200 raw hex literals across the
launchers, sidebar, systray, vitals and notifications, and an orange one
(#e8722a) that only the dense bar had, tokenized as per-file properties.

This unifies on the ORANGE values under the AMBER naming scheme, and moves the
lot into widgets/theme/Theme.qml. `surface` takes the dense bar's void
(#0a0a0a) rather than the old panel background. Zero color and font literals
remain anywhere under widgets/ outside Theme.qml.

Collisions resolved, all near-duplicates that wanted to be one token:
  - #0F1012 + #0A0A0C + #0a0a0a -> surface
  - #EEEEEE + #dedede           -> text
  - #7A7B7D + #858585           -> muted
  - #292C30 + #22262C           -> raised
  - #FFD063 + #e8722a           -> accent

Two derived things rather than literals. accentSoft (the pale flash the
top/bottom bars show while a launcher is open) was a hand-picked #FFF3C0
against amber, which is simply wrong against orange; it is now
Qt.tint(accent, white 55%), a ratio checked against the original (amber tinted
55% gives #FFE9B8 vs the hand-picked #FFF3C0). And the dense bar had been
hand-encoding Qt.rgba(0.87,0.87,0.87,a) and Qt.rgba(0.91,0.45,0.16,a), which
are just text and accent at alpha -- now textAlpha(a)/accentAlpha(a), so they
track a palette change instead of silently drifting.

Fonts came along too. Digital-7 Mono is dropped for DepartureMono: it was
never packaged, relying on a manual ~/.dots/fonts/digital_7 install that does
not exist on terra, so `fc-match "Digital-7 Mono"` resolved to DejaVu Sans and
all 38 of those sites -- the launcher lists, sidebar clock, systray labels,
every vitals readout -- were silently rendering in a PROPORTIONAL fallback.
Numeric columns should visibly improve. readoutFont is an alias of displayFont
rather than a second literal so the two roles cannot drift apart.

quickshell/CLAUDE.md updated: it said "No shared theme/tokens file yet" and
told contributors to grep for the existing hex color, which would now
reintroduce exactly what this removes.

Verified: no file references Theme. without the import, none imports it
unused, and the whole shell -- launchers, sidebar, vitals, systray,
notifications, not just the harness -- hot-reloaded clean on terra.
tests/HeadlessSmoke.qml deliberately keeps its own copies; its value is having
no dependencies.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SgcWkm3t6BDQktYHQvb8Hx

dotfiles/quickshell/widgets/input/TextField.qml

@@ -5,6 +5,7 @@ import QtQuick.Layouts
 import QtQuick.Shapes
 
 import qs.widgets.decoration
+import qs.widgets.theme
 
 WrapperItem {
     RowLayout {
@@ -24,7 +25,7 @@ WrapperItem {
 
                 ShapePath {
                     strokeWidth: 0
-                    fillColor: "#0F1012"
+                    fillColor: Theme.surface
 
                     startX: 8
                     startY: 0
@@ -52,7 +53,7 @@ WrapperItem {
 
                 ShapePath {
                     strokeWidth: 0
-                    fillColor: "#0F1012"
+                    fillColor: Theme.surface
 
                     startX: 16
                     startY: 0
@@ -83,7 +84,7 @@ WrapperItem {
                     startY: 0
 
                     strokeWidth: 0
-                    fillColor: "#0F1012"
+                    fillColor: Theme.surface
 
                     PathLine {
                         x: shape.width