style: replace em dashes with hyphens throughout codebase

Replace all — with - in all source files (JS, CSS, HTML, JSON,
Markdown) for consistency and readability.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

public/locales/de.json

@@ -21,7 +21,7 @@
     "errorOccurred": "Etwas ist schiefgelaufen.",
     "unexpectedError": "Ein unerwarteter Fehler ist aufgetreten.",
     "errorGeneric": "Ein Fehler ist aufgetreten.",
-    "updateAvailable": "Update verfügbar — Seite neu laden für die neueste Version.",
+    "updateAvailable": "Update verfügbar - Seite neu laden für die neueste Version.",
     "titleRequired": "Titel ist erforderlich",
     "nameRequired": "Name ist erforderlich",
     "contentRequired": "Inhalt ist erforderlich",
@@ -82,7 +82,7 @@
     "title": "Aufgaben",
     "newTask": "Neue Aufgabe",
     "editTask": "Aufgabe bearbeiten",
-    "emptyTitle": "Keine Aufgaben — alles erledigt?",
+    "emptyTitle": "Keine Aufgaben - alles erledigt?",
     "emptyDescription": "Neue Aufgaben über den + Button erstellen.",
     "titleLabel": "Titel *",
     "titlePlaceholder": "Was muss erledigt werden?",
@@ -93,7 +93,7 @@
     "dueDateLabel": "Fälligkeit",
     "dueTimeLabel": "Uhrzeit",
     "assignedLabel": "Zugewiesen an",
-    "assignedNobody": "— Niemand —",
+    "assignedNobody": "- Niemand -",
     "statusLabel": "Status",
     "priorityUrgent": "Dringend",
     "priorityHigh": "Hoch",
@@ -259,7 +259,7 @@
     "locationLabel": "Ort",
     "locationPlaceholder": "Optional",
     "assignedLabel": "Zugewiesen an",
-    "assignedNobody": "— Niemand —",
+    "assignedNobody": "- Niemand -",
     "colorLabel": "Farbe",
     "descriptionLabel": "Beschreibung",
     "descriptionPlaceholder": "Optional…",
@@ -428,7 +428,7 @@
     "savedToast": "Eintrag gespeichert",
     "deletedToast": "Eintrag gelöscht",
     "loadError": "Budget konnte nicht geladen werden.",
-    "trendNeutral": "— wie {{month}}",
+    "trendNeutral": "- wie {{month}}",
     "validAmountRequired": "Gültigen Betrag eingeben",
     "dateRequired": "Datum ist erforderlich",
     "catFood": "Lebensmittel",

public/locales/en.json

@@ -21,7 +21,7 @@
     "errorOccurred": "Something went wrong.",
     "unexpectedError": "An unexpected error occurred.",
     "errorGeneric": "An error occurred.",
-    "updateAvailable": "Update available — reload the page to get the latest version.",
+    "updateAvailable": "Update available - reload the page to get the latest version.",
     "titleRequired": "Title is required",
     "nameRequired": "Name is required",
     "contentRequired": "Content is required",
@@ -82,7 +82,7 @@
     "title": "Tasks",
     "newTask": "New Task",
     "editTask": "Edit Task",
-    "emptyTitle": "No tasks — all done?",
+    "emptyTitle": "No tasks - all done?",
     "emptyDescription": "Create new tasks with the + button.",
     "titleLabel": "Title *",
     "titlePlaceholder": "What needs to be done?",
@@ -93,7 +93,7 @@
     "dueDateLabel": "Due date",
     "dueTimeLabel": "Time",
     "assignedLabel": "Assigned to",
-    "assignedNobody": "— Nobody —",
+    "assignedNobody": "- Nobody -",
     "statusLabel": "Status",
     "priorityUrgent": "Urgent",
     "priorityHigh": "High",
@@ -259,7 +259,7 @@
     "locationLabel": "Location",
     "locationPlaceholder": "Optional",
     "assignedLabel": "Assigned to",
-    "assignedNobody": "— Nobody —",
+    "assignedNobody": "- Nobody -",
     "colorLabel": "Color",
     "descriptionLabel": "Description",
     "descriptionPlaceholder": "Optional…",
@@ -428,7 +428,7 @@
     "savedToast": "Entry saved",
     "deletedToast": "Entry deleted",
     "loadError": "Budget could not be loaded.",
-    "trendNeutral": "— same as {{month}}",
+    "trendNeutral": "- same as {{month}}",
     "validAmountRequired": "Please enter a valid amount",
     "dateRequired": "Date is required",
     "catFood": "Groceries",

public/locales/it.json

@@ -21,7 +21,7 @@
     "errorOccurred": "Si è verificato un errore.",
     "unexpectedError": "Si è verificato un errore imprevisto.",
     "errorGeneric": "Si è verificato un errore.",
-    "updateAvailable": "Aggiornamento disponibile — ricarica la pagina per ottenere l'ultima versione.",
+    "updateAvailable": "Aggiornamento disponibile - ricarica la pagina per ottenere l'ultima versione.",
     "titleRequired": "Il titolo è obbligatorio",
     "nameRequired": "Il nome è obbligatorio",
     "contentRequired": "Il contenuto è obbligatorio",
@@ -82,7 +82,7 @@
     "title": "Compiti",
     "newTask": "Nuovo compito",
     "editTask": "Modifica compito",
-    "emptyTitle": "Nessun compito — tutto fatto?",
+    "emptyTitle": "Nessun compito - tutto fatto?",
     "emptyDescription": "Crea nuovi compiti con il pulsante +.",
     "titleLabel": "Titolo *",
     "titlePlaceholder": "Cosa bisogna fare?",
@@ -93,7 +93,7 @@
     "dueDateLabel": "Data di scadenza",
     "dueTimeLabel": "Ora",
     "assignedLabel": "Assegnato a",
-    "assignedNobody": "— Nessuno —",
+    "assignedNobody": "- Nessuno -",
     "statusLabel": "Stato",
     "priorityUrgent": "Urgente",
     "priorityHigh": "Alta",
@@ -259,7 +259,7 @@
     "locationLabel": "Luogo",
     "locationPlaceholder": "Opzionale",
     "assignedLabel": "Assegnato a",
-    "assignedNobody": "— Nessuno —",
+    "assignedNobody": "- Nessuno -",
     "colorLabel": "Colore",
     "descriptionLabel": "Descrizione",
     "descriptionPlaceholder": "Opzionale…",
@@ -428,7 +428,7 @@
     "savedToast": "Voce salvata",
     "deletedToast": "Voce eliminata",
     "loadError": "Impossibile caricare il bilancio.",
-    "trendNeutral": "— come {{month}}",
+    "trendNeutral": "- come {{month}}",
     "validAmountRequired": "Inserisci un importo valido",
     "dateRequired": "La data è obbligatoria",
     "catFood": "Spesa alimentare",