theme: calm YoRHa lock screen and power menu; nvim and btop follow

The lock screen and the power menu lose the last Persona motion: no split
display type, no grid sweeping in behind a dark column, no tilted slabs, no
skewed password blocks or hard shake. Both are now one small group of type in
the dark — the porthole mark, a line of light display type, a status line, and
either a rounded password field that fills with dots or a NieR menu whose
selected row is a pill of light (rust for the session-ending three). The lock
keeps the wallpaper almost whole; a wrong password nudges the field once and
turns it to rust. P5Backdrop and the grid texture had no users left and go.

Neovim moves to a local yorha colorscheme (nvim submodule) and btop gets a
yorha theme with hairline boxes and grey-to-light gradients.

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

quickshell/components/P5Backdrop.qml

@@ -1,91 +0,0 @@
-import QtQuick
-import "root:/config"
-import "root:/components"
-
-// The shared ground for the two full-screen surfaces, in the NieR menu
-// pattern: a hairline grid that sweeps in from the left, a darker column down
-// the left-hand side for the menu or the clock to stand in, and a dot wash
-// over the top.
-//
-// The lock screen and the power menu both stand on this one component, which
-// is what makes them read as the same object seen twice rather than as two
-// guesses at the same brief.
-Item {
-    id: root
-
-    // 0 = withdrawn, 1 = fully present. Drives the grid slide, the grid
-    // opacity and the column together, so a caller animates one number instead
-    // of keeping three in sync. The power menu runs it both ways on open and
-    // close; the lock runs it once on entry.
-    property real reveal: 1
-
-    property color tone: Theme.accent
-
-    // The column: a band of the void, edged by a hairline of the light.
-    // `wedge*` names are kept from the Persona layout so callers did not have
-    // to move; there is nothing wedge-shaped left.
-    property bool wedge: true
-    property real wedgeOpacity: 0.35
-    property real wedgeLeft: 0
-    property real wedgeSpan: 0.34
-
-    property bool stripes: true
-    property real stripeOpacity: 0.05
-
-    property bool halftone: true
-    property real halftoneOpacity: 0.05
-    property color halftoneColor: Theme.primary
-
-    // Hairline grid, sliding in from off-screen left.
-    Image {
-        anchors.fill: parent
-        visible: root.stripes && root.reveal > 0
-        source: Theme.texGrid
-        fillMode: Image.Tile
-        opacity: root.stripeOpacity * root.reveal
-        smooth: false
-
-        layer.enabled: true
-        layer.effect: TintEffect {
-            tintColor: root.tone
-        }
-
-        transform: Translate {
-            x: -root.width * (1 - root.reveal)
-        }
-    }
-
-    // The column. Drawn after the grid so it reads as a panel laid over it.
-    Item {
-        x: root.wedgeLeft * root.width
-        width: root.wedgeSpan * root.width
-        height: root.height
-        visible: root.wedge && root.reveal > 0
-        opacity: root.reveal
-
-        Rectangle {
-            anchors.fill: parent
-            color: Theme.alpha(Theme.ink, root.wedgeOpacity)
-        }
-
-        // Its edge, drawn top-down as the column arrives.
-        Rectangle {
-            anchors.right: parent.right
-            width: 1
-            height: parent.height * root.reveal
-            color: Theme.alpha(root.tone, 0.35)
-        }
-    }
-
-    // Dot wash over the whole thing.
-    Image {
-        anchors.fill: parent
-        visible: root.halftone
-        source: Theme.texDots
-        fillMode: Image.Tile
-        opacity: root.halftoneOpacity
-        smooth: false
-        layer.enabled: true
-        layer.effect: TintEffect { tintColor: root.halftoneColor }
-    }
-}