refactor: extract terminal launch logic into shared script

Add terminal-launcher script as a single entry point for launching
foot-based terminals with a given class and command. Migrate all
.desktop files to use it instead of inline foot invocations.

Simplify hyprland keybindings by replacing inline focus_or_launch
with hl.dsp.exec_cmd

config/hypr/hyprland.lua

@@ -274,21 +274,24 @@ function toggle_master()
     hl.dispatch(hl.dsp.layout("mfact exact " .. mfact))
 end
 
-hl.bind(LEADER .. "return", function()
-    focus_or_launch({
-        match = "tmux",
-        field = "class",
-        cmd = "gtk-launch tmux.desktop",
-    })
-end, { description = "Open tmux terminal" })
+-- hl.bind(LEADER .. "return", function()
+--     focus_or_launch({
+--         match = "terminal-tmux",
+--         field = "class",
+--         cmd = "gtk-launch tmux.desktop",
+--     })
+-- end, { description = "Open tmux terminal" })
 
-hl.bind(LEADER .. "SHIFT + return", function()
-    focus_or_launch({
-        match = "herdr",
-        field = "class",
-        cmd = "gtk-launch herdr.desktop",
-    })
-end, { description = "Open herdr terminal" })
+-- hl.bind(LEADER .. "SHIFT + return", function()
+--     focus_or_launch({
+--         match = "terminal-herdr",
+--         field = "class",
+--         cmd = "gtk-launch herdr.desktop",
+--     })
+-- end, { description = "Open herdr terminal" })
+
+hl.bind(LEADER .. "SHIFT + return", hl.dsp.exec_cmd("gtk-launch herdr.desktop"), { description = "Open herdr terminal" })
+hl.bind(LEADER .. "return", hl.dsp.exec_cmd("gtk-launch tmux.desktop"), { description = "Open tmux terminal" })
 
 hl.bind(LEADER .. "B", hl.dsp.exec_raw(browser), { description = "Open browser" })
 hl.bind(LEADER .. "T", hl.dsp.exec_raw(terminal .. " -e btop"), { description = "Open system monitor" })