hyprland: migrate to Lua config, add pc/laptop profiles

hyprlang has been deprecated since Hyprland 0.55 and is dropped after 1-2
releases; this box runs 0.56.2. Migrate Hyprland's own config to Lua and
split the machine-specific parts into profiles.

Config:
- hyprland.lua entry point; the .conf tree is left in place as a rollback
  path (Hyprland prefers hyprland.lua and only decides at startup).
- Each require() is its own Lua scope, so hyprlang's global "$VAR" no longer
  crosses files: vars.lua / apps.lua / theme/colors.lua return tables.
- hypridle, hyprlock, plugins/* and pyprland.toml stay hyprlang -- the other
  hypr* tools keep it.

Profiles (configs/profiles/):
- pc     -> DP-1 / HDMI-A-1 / DP-2, all 1920x1080
- laptop -> eDP-1 3072x1920@120 scale 2.0, DP-1, HDMI-A-1 mirroring eDP-1
- Each owns its monitors and workspace-to-monitor mapping; common.lua
  generates the 30 workspace rules from the three outputs.
- Selected by $HYPR_PROFILE, else hostname (mainPC -> pc), else laptop.

Fixes:
- pyprland.toml called swww, which is not installed; the wallpaper backend
  here is awww. The rotation timer failed silently and both outputs stayed
  at color: 000000.
- XF86InputRaiseVolume / XF86InputLowerVolume are not real keysyms (no
  XF86Input* family in xkbcommon). They were dead in .conf too; hyprlang
  ignored them silently, hl.bind rejects them. Commented out.
- SUPER+SHIFT+R was bound twice (notification reload + bar reload). hyprlang
  ran both; in Lua the second would shadow the first, so they are merged.
- The waybar layer rule set no effects and was a no-op; dropped.
- Polkit autostart now picks hyprpolkitagent or polkit-gnome by what is
  installed, so one file works on both machines.

Verified with `Hyprland --verify-config` on both profiles (config ok).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01StGBghPW9Dm7z7uj2VNWHr

hypr/theme/decoration.lua

@@ -0,0 +1,81 @@
+-- Was: theme/decoration.conf
+
+local c = require("theme.colors")
+
+-- The old 4-stop 45deg gradient, reused for windows and groups.
+local activeGradient = {
+    colors = {
+        c.rgba("text",     "ee"),
+        c.rgba("lavender", "69"),
+        c.rgba("lavender", "69"),
+        c.rgba("text",     "ee"),
+    },
+    angle = 45,
+}
+
+local inactiveBorder = c.rgba("lavender", "69")
+
+hl.config({
+    general = {
+        border_size = 2,
+        col = {
+            active_border   = activeGradient,
+            inactive_border = inactiveBorder,
+        },
+
+        gaps_in  = 3,
+        gaps_out = 5,
+    },
+
+    decoration = {
+        rounding = 7,
+
+        active_opacity   = 0.92,
+        inactive_opacity = 0.90,
+
+        blur = {
+            enabled           = true,
+            size              = 5,
+            passes            = 4,
+            ignore_opacity    = true,
+            new_optimizations = true,
+            xray              = false,
+            noise             = 0.0,
+            popups            = true,
+        },
+
+        shadow = {
+            enabled        = true,
+            range          = 30,
+            scale          = 2,
+            render_power   = 5,
+            color          = c.rgb("crust"),
+            color_inactive = c.rgb("surface0"),
+        },
+
+        dim_inactive = false,
+        dim_strength = 0.05,
+    },
+
+    group = {
+        col = {
+            border_active          = activeGradient,
+            border_inactive        = inactiveBorder,
+            border_locked_active   = activeGradient,
+            border_locked_inactive = inactiveBorder,
+        },
+
+        groupbar = {
+            col = {
+                active          = c.rgba("lavender", "CC"),
+                inactive        = c.rgba("subtext1", "99"),
+                locked_active   = c.rgba("maroon",   "CC"),
+                locked_inactive = c.rgba("subtext1", "99"),
+            },
+            font_family = "JetBrainsMono Nerd Font",
+            font_size   = 14,
+            text_color  = c.rgb("crust"),
+            height      = 16,
+        },
+    },
+})