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/overlays/Osd.qml

@@ -171,8 +171,8 @@ PanelWindow {
                     anchors.verticalCenter: parent.verticalCenter
                     // Natural width, not a fixed one — SplitText offsets its
                     // ghosts with left/right anchor margins, so pinning the
-                    // width and right-aligning the text would flatten the RGB
-                    // split away. The title's left edge is anchored, so a
+                    // width and right-aligning the text would flatten the
+                    // glitch flicker away. The title's left edge is anchored, so a
                     // widening readout only moves its own left edge.
                     text: Math.round(root.level * 100) + "%"
                     pixelSize: Theme.fsBody
@@ -181,10 +181,10 @@ PanelWindow {
 
             MeterBar {
                 width: parent.width
-                height: 10
+                height: 4
                 segments: 20
-                segmentWidth: (width - 19 * 3) / 20
-                spacing: 3
+                segmentWidth: (width - 19 * 2) / 20
+                spacing: 2
                 value: root.level * 100
                 activeColor: root.tone
             }