fix: make culture-sensitive formatting explicit (CA1305)

src/LageBuch.App/Services/IncidentHostController.cs

@@ -1,3 +1,4 @@
+using System.Globalization;
 using System.Net;
 using LageBuch.AppLogic;
 using LageBuch.AppLogic.Services;
@@ -39,7 +40,7 @@ public async Task StartAsync(LocalIncidentSession session)
         // A fresh 4-digit PIN per share session: the host reads it out, joiners type it (§ #64).
         // Cryptographic RNG so the PIN isn't predictable from a seeded/observed sequence — cheap
         // hardening even though a 4-digit space is small (brute-force is the accepted, documented risk).
-        var pin = System.Security.Cryptography.RandomNumberGenerator.GetInt32(0, 10_000).ToString("D4");
+        var pin = System.Security.Cryptography.RandomNumberGenerator.GetInt32(0, 10_000).ToString("D4", CultureInfo.InvariantCulture);
         var host = new IncidentHost(session, _clock, _appVersion, _ui, pin);
         await host.StartAsync(IPAddress.Any);
         _host = host;

src/LageBuch.AppLogic/ViewModels/HomeViewModel.cs

@@ -1,4 +1,5 @@
 using System.Collections.ObjectModel;
+using System.Globalization;
 using System.Net.Sockets;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
@@ -81,7 +82,7 @@ private async Task NewIncidentAsync(NewIncidentRequest request)
         // Date + time + Stichwort, e.g. "20260819-2217-B3P.fwincident" -- the Einsatznummer is
         // unknown at creation (#69) and no longer part of the filename; it can be added later from
         // the workspace header. No Stichwort at all just leaves the timestamp alone.
-        var timestamp = _clock.Now.ToString("yyyyMMdd-HHmm");
+        var timestamp = _clock.Now.ToString("yyyyMMdd-HHmm", CultureInfo.InvariantCulture);
         var stem = string.IsNullOrWhiteSpace(request.Keyword)
             ? timestamp
             : $"{timestamp}-{StripInvalidFileNameChars(request.Keyword.Trim())}";

src/LageBuch.AppLogic/ViewModels/ScbaViewModel.cs

@@ -1,4 +1,5 @@
 using System.Collections.ObjectModel;
+using System.Globalization;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using LageBuch.AppLogic.Services;
@@ -70,7 +71,7 @@ public ScbaTruppRow(
     public bool IsAlarm => _trupp.IsAlarm(_clock.Now);
     public bool IsControlDue => _trupp.IsControlDue(_clock.Now);
 
-    public string StartTimeDisplay => _trupp.StartTime is { } s ? s.ToString("HH:mm") : "—";
+    public string StartTimeDisplay => _trupp.StartTime is { } s ? s.ToString("HH:mm", CultureInfo.InvariantCulture) : "—";
     public string? PressureDisplay => _trupp.LatestPressure is { } p ? $"{p} bar" : null;
 
     public string ElapsedDisplay => _trupp.HasStarted ? Clock(_trupp.Elapsed(_clock.Now)) : "—";

src/LageBuch.AppLogic/ViewModels/TasksViewModel.cs

@@ -72,13 +72,13 @@ public TasksViewModel(
     // Shared with TaskDialogViewModel (same assembly) so picker wording matches everywhere.
     internal static IReadOnlyList<ImportanceOption> ImportanceLevels() =>
         Enum.GetValues<TaskImportance>()
-            .OrderByDescending(v => Convert.ToInt32(v))
+            .OrderByDescending(v => (int)v)
             .Select(v => new ImportanceOption(v, Formatting.Level(v)))
             .ToArray();
 
     internal static IReadOnlyList<UrgencyOption> UrgencyLevels() =>
         Enum.GetValues<TaskUrgency>()
-            .OrderByDescending(v => Convert.ToInt32(v))
+            .OrderByDescending(v => (int)v)
             .Select(v => new UrgencyOption(v, Formatting.Level(v)))
             .ToArray();
 

src/LageBuch.Documents/Sections/ForcesSection.cs

@@ -1,3 +1,4 @@
+using System.Globalization;
 using LageBuch.Domain;
 using QuestPDF.Fluent;
 using QuestPDF.Helpers;
@@ -40,7 +41,7 @@ public static void Compose(IContainer container, Incident incident)
                         table.Cell().Element(Cells.Body).Text(Formatting.OrDash(unit.CallSign));
                         // Stärke im 1/1/2-Format: Führungskräfte/Mannschaft/Gesamt (#76).
                         table.Cell().Element(Cells.Body).Text(unit.StrengthText);
-                        table.Cell().Element(Cells.Body).Text(unit.ScbaCount.ToString());
+                        table.Cell().Element(Cells.Body).Text(unit.ScbaCount.ToString(CultureInfo.InvariantCulture));
                         table.Cell().Element(Cells.Body).Text(Formatting.OrDash(unit.Status));
                         table.Cell().Element(Cells.Body).Text(Formatting.OrDash(unit.Notes));
                     }
@@ -56,7 +57,7 @@ public static void Compose(IContainer container, Incident incident)
                 t.Span("Gesamtstärke: ").SemiBold();
                 t.Span($"{incident.TotalOfficer}/{incident.TotalPersonnel - incident.TotalOfficer}/{incident.TotalPersonnel}");
                 t.Span("   davon Atemschutzgeräteträger: ").SemiBold();
-                t.Span(incident.TotalScba.ToString());
+                t.Span(incident.TotalScba.ToString(CultureInfo.InvariantCulture));
             });
         });
     }

src/LageBuch.Persistence/IncidentRepository.cs

@@ -1,3 +1,4 @@
+using System.Globalization;
 using LageBuch.Domain;
 using LageBuch.Persistence.Sqlite;
 using Microsoft.Data.Sqlite;
@@ -277,7 +278,7 @@ private static void WriteChecklist(SqliteConnection cn, SqliteTransaction tx, IR
             using var cmd = cn.CreateCommand();
             cmd.CommandText = "SELECT state FROM incident_meta LIMIT 1;";
             var raw = cmd.ExecuteScalar();
-            return raw is null ? null : (IncidentState)Convert.ToInt32(raw);
+            return raw is null ? null : (IncidentState)Convert.ToInt32(raw, CultureInfo.InvariantCulture);
         }
         catch
         {
@@ -308,7 +309,7 @@ public Incident Load(string path)
         {
             cmd.CommandText = "SELECT state FROM incident_meta LIMIT 1;";
             var raw = cmd.ExecuteScalar() ?? throw new InvalidOperationException("No incident in file.");
-            state = (IncidentState)Convert.ToInt32(raw);
+            state = (IncidentState)Convert.ToInt32(raw, CultureInfo.InvariantCulture);
         }
 
         using var cn = state == IncidentState.Closed
@@ -408,15 +409,15 @@ public Incident Load(string path)
                 var fd = System.Text.Json.JsonSerializer.Deserialize<Dictionary<string, string?>>(fdJson)
                          ?? new Dictionary<string, string?>();
                 var fdDict = fd.ToDictionary(
-                    kv => int.Parse(kv.Key),
+                    kv => int.Parse(kv.Key, CultureInfo.InvariantCulture),
                     kv => kv.Value);
                 // apartment_labels is null on rows written before this column existed.
                 var alJson = Str(r, 6);
                 var alDict = alJson is null
                     ? new Dictionary<int, string?>()
                     : (System.Text.Json.JsonSerializer.Deserialize<Dictionary<string, string?>>(alJson)
                         ?? new Dictionary<string, string?>())
-                        .ToDictionary(kv => int.Parse(kv.Key), kv => kv.Value);
+                        .ToDictionary(kv => int.Parse(kv.Key, CultureInfo.InvariantCulture), kv => kv.Value);
                 return Domain.CoMeasurement.Building.Rehydrate(Guid.Parse(r.GetString(0)), r.GetString(1),
                     r.GetInt32(2), r.GetInt32(3), fdDict, r.GetInt32(5), alDict);
             });
@@ -449,7 +450,7 @@ public Incident Load(string path)
         return Incident.Rehydrate(
             Guid.Parse((string)meta[0]!),
             ParseDate((string)meta[1]!),
-            (IncidentState)Convert.ToInt32(meta[2]),
+            (IncidentState)Convert.ToInt32(meta[2], CultureInfo.InvariantCulture),
             incidentNumber,
             meta[5] as string,
             meta[6] as string,

src/LageBuch.Persistence/Sqlite/Migrations.cs

@@ -1,3 +1,4 @@
+using System.Globalization;
 using LageBuch.Domain.Atemschutz;
 using Microsoft.Data.Sqlite;
 
@@ -18,7 +19,7 @@ public static int GetVersion(SqliteConnection cn)
         using var read = cn.CreateCommand();
         read.CommandText = "SELECT version FROM schema_version LIMIT 1;";
         var result = read.ExecuteScalar();
-        return result is null ? 0 : Convert.ToInt32(result);
+        return result is null ? 0 : Convert.ToInt32(result, CultureInfo.InvariantCulture);
     }
 
     public static void Migrate(SqliteConnection cn)

src/LageBuch.Sync/SnapshotMapper.cs

@@ -1,3 +1,4 @@
+using System.Globalization;
 using LageBuch.Domain;
 using LageBuch.Domain.Atemschutz;
 using LageBuch.Domain.CoMeasurement;
@@ -47,9 +48,9 @@ public static IncidentSnapshot ToSnapshot(Incident incident)
                 t.CreatedBy, t.CreatedAt, t.DueAt, t.CompletedAt, t.CompletedBy)).ToList(),
             incident.Buildings.Select(b => new BuildingDto(
                 b.Id, b.Name, b.FloorCount, b.ApartmentsPerFloor,
-                b.FloorDescriptions.ToDictionary(kv => kv.Key.ToString(), kv => kv.Value),
+                b.FloorDescriptions.ToDictionary(kv => kv.Key.ToString(CultureInfo.InvariantCulture), kv => kv.Value),
                 b.Ordinal,
-                b.ApartmentLabels.ToDictionary(kv => kv.Key.ToString(), kv => kv.Value))).ToList(),
+                b.ApartmentLabels.ToDictionary(kv => kv.Key.ToString(CultureInfo.InvariantCulture), kv => kv.Value))).ToList(),
             incident.Dwellings.Select(d => new DwellingDto(
                 d.Id, d.BuildingId, d.FloorOrdinal, d.ApartmentNumber,
                 d.ResidentName, d.Status, d.KeyAvailable, d.CoValue)).ToList());
@@ -86,11 +87,11 @@ public static Incident FromSnapshot(IncidentSnapshot snapshot)
             snapshot.Buildings.Select(b => Building.Rehydrate(
                 b.Id, b.Name, b.FloorCount, b.ApartmentsPerFloor,
                 b.FloorDescriptions.ToDictionary(
-                    kv => int.Parse(kv.Key),
+                    kv => int.Parse(kv.Key, CultureInfo.InvariantCulture),
                     kv => kv.Value),
                 b.Ordinal,
                 b.ApartmentLabels?.ToDictionary(
-                    kv => int.Parse(kv.Key),
+                    kv => int.Parse(kv.Key, CultureInfo.InvariantCulture),
                     kv => kv.Value))),
             snapshot.Dwellings.Select(d => Dwelling.Rehydrate(
                 d.Id, d.BuildingId, d.FloorOrdinal, d.ApartmentNumber,

tests/LageBuch.Acceptance.Tests/ModuleTabsScrollingTests.cs

@@ -1,3 +1,4 @@
+using System.Globalization;
 using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Controls.Presenters;
@@ -56,7 +57,7 @@ public void Nav_rail_stays_one_column_and_scrolls_on_a_short_viewport()
             .ToArray();
         Assert.True(columns.Length == 1,
             $"nav rail wrapped into {columns.Length} columns at x=" +
-            string.Join(", ", columns.Select(c => c.ToString("F0"))) +
+            string.Join(", ", columns.Select(c => c.ToString("F0", CultureInfo.InvariantCulture))) +
             " -- it must overflow into a scrollbar instead.");
 
         // The overflow lands in a ScrollViewer, not silent clipping.