Fix error message capitalization and add workflow permissions

Co-authored-by: abeckDev <8720854+abeckDev@users.noreply.github.com>

Author: Copilot

.github/workflows/dotnet-ci.yml

@@ -9,6 +9,9 @@ on:
 jobs:
   build-and-test:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      checks: write
 
     steps:
     - uses: actions/checkout@v4

AbeckDev.DbTimetable.Mcp.Test/TimetableToolsTests.cs

@@ -270,7 +270,7 @@ public async Task GetStationDetails_WithHttpRequestException_ReturnsErrorMessage
         var result = await tools.GetStationDetails(pattern);
 
         // Assert
-        Assert.Contains("Error fetching station Details:", result);
+        Assert.Contains("Error fetching station details:", result);
         Assert.Contains(exceptionMessage, result);
     }
 

AbeckDev.DbTimetable.Mcp/Tools.cs

@@ -106,7 +106,7 @@ public async Task<string> GetStationBoard(
             }
             catch (HttpRequestException ex)
             {
-                return $"Error fetching station Details: {ex.Message}";
+                return $"Error fetching station details: {ex.Message}";
             }
             catch (Exception ex)
             {