feat: add tmux popup commands for reminders and calendar

- Refactor `main.sh` to support `reminders` and `calendar` commands,
  displaying tmux popups with localized titles and current date/time.
- Add `show_reminders.sh` and `show_calendar.sh` scripts to render
  reminders and 2-week calendar views using `rem`.
- Update `tmux-remind.tmux` to bind `prefix + r` for reminders and
  `prefix + c` for calendar popups.
- Improve script robustness with `set -euo pipefail` and dynamic script
  directory resolution.

scripts/main.sh

@@ -1,5 +1,10 @@
 #!/usr/bin/env bash
 
+set -euo pipefail
+set -x
+
+CURRENT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
 # Funzione per leggere opzioni tmux con default
 get_tmux_option() {
     local option="$1"
@@ -16,13 +21,28 @@ get_tmux_option() {
 # Esempio: leggi configurazione utente
 # my_option=$(get_tmux_option "@plugin_option" "default_value")
 
-main() {
-    # Logica del plugin qui
-    tmux display-message "Plugin caricato!"
+function get_italian_datetime {
+    date "+%d/%m/%Y %H:%M"
 }
 
-main
+function show_reminders {
+    local datetime
+    datetime=$(get_italian_datetime)
+    tmux display-popup -T "#[align=centre]Impegni di oggi - $datetime" -w 60% -h 50% -x C -y C -E -- "$CURRENT_DIR/show_reminders.sh"
+}
 
+function show_calendar {
+    local datetime
+    datetime=$(get_italian_datetime)
+    tmux display-popup -T "#[align=centre]Prossime 2 settimane - $datetime" -w 99% -h 99% -x C -y C -E -- "$CURRENT_DIR/show_calendar.sh"
+}
 
+function main {
+    if [ "$1" == "reminders" ]; then
+        show_reminders
+    else
+        show_calendar
+    fi
+}
 
-# bash -c "tput civis; trap \"tput cnorm\" EXIT; rem -m -b1 -gaa -q -aa -iinclude_todo=1 -@2; read -r"
+main "$@"