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/configs/profiles/common.lua

@@ -0,0 +1,31 @@
+-- Shared profile logic: given three outputs, lay out the 30 workspaces.
+--
+-- 1-10  -> MONITOR1, 11-20 -> MONITOR2, 21-30 -> MONITOR3.
+-- The first workspace of each block is that monitor's default.
+-- Was: configs/workspaces.conf (byte-identical on both machines, because it
+-- only ever referred to $MONITOR1/2/3).
+
+local M = {}
+
+function M.workspaces(monitors)
+    local blocks = {
+        { first = 1,  last = 10, monitor = monitors[1] },
+        { first = 11, last = 20, monitor = monitors[2] },
+        { first = 21, last = 30, monitor = monitors[3] },
+    }
+
+    for _, block in ipairs(blocks) do
+        for ws = block.first, block.last do
+            hl.workspace_rule({
+                workspace = tostring(ws),
+                monitor   = block.monitor,
+                default   = (ws == block.first),
+            })
+        end
+    end
+end
+
+-- Gaming workspaces (10 / 20 / 30) had these commented out in workspaces.conf:
+--   no_rounding = true, decorate = false, gaps_in = -1, gaps_out = 0, no_border = true
+
+return M