theme: strip the remaining Persona punch from Hyprland and the popouts

Hyprland:
- Windows round at 8px, concentric with the porthole's 18px corners at
  the 10px gap, instead of square corners inside a rounded opening.
- Group tabs are solid hull slabs; the titles used to float over the
  wallpaper. The current tab is lifted a step with its title in the light.
- Motion rewritten to glide and settle: no overshoot curve, gentler
  popin, workspaces slide-fade a short way instead of sweeping the whole
  screen, and layers only fade so they never stack on quickshell's own
  slides.

Quickshell:
- Album art in the bar and the media popout is square in a hairline frame,
  not masked to a leaning chamfered shape; the accent slab under the
  popout art is gone, and a track change dips the title instead of
  tilting the art.
- The bar's equaliser is a five-hairline signal meter that rests as dots.
- Segment meters (system, battery, OSD) are 4px rows instead of 10-12px
  blocks; the toast fuse is a hairline; the clock's accent slab is a
  neutral divider.
- No hover pops: rail icons, tray icons, media transport buttons and
  P5Button no longer scale up or lunge sideways; the icon bump is reduced.

Terminal: ANSI bright black drops to #464d44. TUIs use it as a panel fill,
and at the outline grey it read as a flat light slab.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

quickshell/components/MetricRow.qml

@@ -2,8 +2,8 @@ import QtQuick
 import "root:/config"
 import "root:/components"
 
-// One metric in a popout: a label and its reading on a line, with a wide
-// sheared segmented meter underneath.
+// One metric in a popout: a label and its reading on a line, with a thin
+// segmented meter underneath.
 //
 // This replaces the radial Gauge. A 270° dial was the only curved thing in a
 // shell whose whole geometry is sheared slabs and hard chamfers, so it read as
@@ -78,7 +78,7 @@ Item {
         anchors.left: parent.left
         anchors.right: parent.right
         anchors.bottom: parent.bottom
-        height: 12
+        height: 4
         segments: root.segments
         spacing: root.segmentSpacing
         // Fill the row exactly rather than leaving a ragged tail on the right.