feat: add configuration management and panel rendering

- Introduced a new `Config` struct for loading application configuration from a TOML file.
- Added support for keybindings and panel configurations, including status widgets.
- Implemented `PtyTerminal` for handling pseudo-terminal interactions.
- Created a rendering module to manage the display of application windows, panels, and dropdowns.
- Refactored the main application loop to utilize the new configuration and rendering logic.
- Removed legacy code related to event handling and rendering from `main.rs`.

config.toml

@@ -0,0 +1,27 @@
+# TUI-WM konfiguration
+
+[[panel]]
+position = "top"
+file = "panels/topbar.toml"
+
+# ── Keybinds ──────────────────────────────────────────────────────────────────
+# scope = "global"  → alltid aktiv, även när en terminal har fokus
+# scope = "wm"      → bara aktiv när ingen terminal är fokuserad (default)
+
+# Öppna Tui-run kommandodialog (global – funkar alltid)
+[[keybind]]
+key = "ctrl+space"
+scope = "global"
+action = { type = "spawn_run_dialog" }
+
+# Starta ny terminal med Alt+Enter (global)
+[[keybind]]
+key = "alt+enter"
+scope = "global"
+action = { type = "spawn_terminal" }
+
+# Avsluta TUI-WM när skrivbordet är fokuserat
+[[keybind]]
+key = "ctrl+q"
+scope = "wm"
+action = { type = "exit" }