feat(themes): add Boreal + make theme appearance per-theme

Boreal — a Nord × Everforest × Dracula dark theme: a boreal forest at
night under the aurora. Nord's frost bones, Everforest's comfort, Dracula's
jewel-tone violet/cyan as the aurora light.

Palette (WCAG-checked, all 24 themes × 7 pairings pass): frost-slate base,
soft-vivid violet accent (#B79BE8, 6.35 on base) + frost-cyan accentAlt
(#86C7C0, 7.84 AAA), sage-green/gold/coral semantics, text 10.66 AAA.

Bespoke, non-standard surfaces:
- Waybar whole-swap (jsonc + css): a floating "aurora frost" bar of three
  frosted-glass pills; launcher+clock left, workspaces centre, and the whole
  right side is ONE continuous pill — the system tray shares its glass with
  the status modules, no separators (the seamless-tray requirement). Full
  module set (parity). GeistMono.
- Rofi: a frosted list base (used by every menu), plus a 4×3 large-icon grid
  for the app launcher only.
- Typography GeistMono Nerd Font (57 MB, new); Iosevka was rejected at 1.1 GB.

Per-theme appearance (new): a preset now carries a full fonts+ui block, like
border, so a theme can ship a bespoke font / terminal opacity / border
thickness / rounding and a switch always replaces it — no leak into the next
theme (verified: boreal→everforest resets mono/rounding/opacity). All 23 other
presets get the current defaults (idempotent — zero visual change). Boreal
runs GeistMono + 0.90 terminal opacity + 3px borders + 12px rounding.

Grid launcher (new, backward-compatible): drun renders via `-theme launcher`;
HM writes ~/.local/share/rofi/themes/launcher.rasi which defaults to
`@import "custom.rasi"` (every other theme's launcher = its list, unchanged),
and a theme may override it (Boreal's grid). Text menus keep the base list.

Wallpaper: an original procedurally-generated aurora-over-treeline (ImageMagick),
palette-matched.

V1: nix flake check --no-build green; strict JSON on every preset; contrast
checker green; the real rofi binary parses the base rasi and resolves
`-theme launcher` + @import + grid overlay; end-to-end eval with boreal active
resolves the waybar whole-swap (tray in the right cluster), the rofi grid
launcher, and the bespoke fonts/opacity/geometry reaching nomarchy.theme, with
no cross-theme contamination. NOT done: on-screen render of the desktop
(V2/V3) and preview.png (deferred to on-hardware capture).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

themes/boreal/waybar.jsonc

@@ -0,0 +1,160 @@
+{
+  "margin-top": 8,
+  "margin-left": 14,
+  "margin-right": 14,
+  "margin-bottom": 0,
+  "height": 38,
+  "layer": "top",
+  "position": "top",
+  "spacing": 4,
+  "reload_style_on_change": true,
+
+  "modules-left": ["custom/nomarchy", "clock", "clock#date"],
+  "modules-center": ["hyprland/workspaces"],
+  "modules-right": ["custom/recording", "custom/updates", "custom/doctor", "idle_inhibitor", "custom/nightlight", "hyprland/language", "custom/vpn", "pulseaudio", "battery", "custom/powerprofile", "tray", "custom/notification", "custom/powermenu"],
+
+  "custom/nomarchy": {
+    "interval": "once",
+    "format": "",
+    "on-click": "nomarchy-menu",
+    "tooltip-format": "Nomarchy menu"
+  },
+
+  "clock": {
+    "format": "{:%H:%M}",
+    "tooltip": true,
+    "tooltip-format": "{:%Z (UTC%z)}\n<tt><small>{calendar}</small></tt>"
+  },
+
+  "clock#date": {
+    "format": "{:%a %d %b}",
+    "tooltip": false
+  },
+
+  "hyprland/workspaces": {
+    "disable-scroll": true,
+    "all-outputs": true,
+    "on-click": "activate",
+    "on-scroll-up": "hyprctl dispatch workspace r+1",
+    "on-scroll-down": "hyprctl dispatch workspace r-1"
+  },
+
+  "custom/recording": {
+    "return-type": "json",
+    "interval": 10,
+    "signal": 8,
+    "exec": "nomarchy-record status",
+    "on-click": "nomarchy-record stop"
+  },
+
+  "custom/updates": {
+    "return-type": "json",
+    "interval": 1800,
+    "signal": 9,
+    "exec": "nomarchy-updates status",
+    "on-click": "sh -c '$TERMINAL -e nomarchy-updates upgrade'"
+  },
+
+  "custom/doctor": {
+    "return-type": "json",
+    "interval": 300,
+    "exec": "nomarchy-doctor-status",
+    "on-click": "nomarchy-menu doctor"
+  },
+
+  "idle_inhibitor": {
+    "format": "{icon}",
+    "format-icons": {
+      "activated": "󰅶",
+      "deactivated": "󰾪"
+    }
+  },
+
+  "custom/nightlight": {
+    "return-type": "json",
+    "interval": 3,
+    "exec": "nomarchy-nightlight status",
+    "on-click": "nomarchy-nightlight toggle"
+  },
+
+  "hyprland/language": {
+    "format": "󰌌 {short}",
+    "tooltip": false
+  },
+
+  "custom/vpn": {
+    "return-type": "json",
+    "interval": 5,
+    "exec": "nomarchy-vpn-status",
+    "on-click": "nomarchy-vpn"
+  },
+
+  "pulseaudio": {
+    "scroll-step": 5,
+    "format": "{icon} {volume}%",
+    "format-bluetooth": "{icon} {volume}%",
+    "format-bluetooth-muted": "{icon} muted",
+    "format-muted": " muted",
+    "format-icons": {
+      "headphone": "",
+      "hands-free": "",
+      "headset": "",
+      "phone": "",
+      "portable": "",
+      "car": "",
+      "default": ["", "", ""]
+    },
+    "on-click": "wpctl set-mute @DEFAULT_AUDIO_SINK@ toggle",
+    "tooltip-format": "{desc} | {volume}%"
+  },
+
+  "battery": {
+    "interval": 30,
+    "states": { "warning": 25, "critical": 10 },
+    "format": "{icon} {capacity}%",
+    "format-charging": " {capacity}%",
+    "format-plugged": " {capacity}%",
+    "format-icons": ["", "", "", "", ""],
+    "on-click": "nomarchy-menu power",
+    "tooltip-format": "Battery status"
+  },
+
+  "custom/powerprofile": {
+    "return-type": "json",
+    "interval": 5,
+    "exec": "nomarchy-powerprofile-status",
+    "on-click": "nomarchy-powerprofile-cycle"
+  },
+
+  "tray": {
+    "icon-size": 15,
+    "spacing": 10
+  },
+
+  "custom/notification": {
+    "format": "{icon}",
+    "return-type": "json",
+    "exec": "swaync-client -swb",
+    "exec-if": "which swaync-client",
+    "escape": true,
+    "tooltip": true,
+    "on-click": "swaync-client -t -sw",
+    "on-click-right": "swaync-client -d -sw",
+    "format-icons": {
+      "none": "",
+      "notification": "",
+      "dnd-none": "",
+      "dnd-notification": "",
+      "inhibited-none": "",
+      "inhibited-notification": "",
+      "dnd-inhibited-none": "",
+      "dnd-inhibited-notification": ""
+    }
+  },
+
+  "custom/powermenu": {
+    "format": "",
+    "on-click": "nomarchy-menu power",
+    "tooltip": false
+  }
+}