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/apps.lua

@@ -0,0 +1,26 @@
+-- Was: configs/default_apps.conf
+
+local bar           = "waybar"
+local notifications = "swaync-client"
+local terminal      = "kitty"
+
+return {
+    launcher = "rofi -show drun",
+
+    bar        = bar,
+    bar_toggle = "killall -SIGUSR1 " .. bar,
+    bar_reload = "killall " .. bar .. "; " .. bar,
+
+    notifications        = notifications,
+    notifications_read   = notifications .. " -C",
+    notifications_toggle = notifications .. " -t",
+    notifications_reload = notifications .. " -R && " .. notifications .. " -rs",
+
+    browser      = "firefox",
+    notetaking   = "notesh",
+    terminal     = terminal,
+    office_suite = "libreoffice",
+    editor       = terminal .. " vim",
+    ide          = "code",
+    file_manager = "nemo",
+}