feat: import leftover student fields into notes and show them on the roster

Store leftover CSV columns on hidden student notes, move catalog import to /events/import, and persist Students index columns from Chapter Settings.

Co-authored-by: Cursor <cursoragent@cursor.com>

Tests/Notes/ImportedFieldsTable_Tests.cs

@@ -0,0 +1,179 @@
+using Core.Notes;
+
+namespace Tests.Notes;
+
+[TestFixture]
+public class ImportedFieldsTable_Tests
+{
+    [Test]
+    public void NormalizeValue_X_BecomesYes()
+    {
+        Assert.That(ImportedFieldsTable.NormalizeValue("x"), Is.EqualTo("Yes"));
+        Assert.That(ImportedFieldsTable.NormalizeValue("X"), Is.EqualTo("Yes"));
+        Assert.That(ImportedFieldsTable.NormalizeValue("  x  "), Is.EqualTo("Yes"));
+    }
+
+    [Test]
+    public void NormalizeValue_Blank_StaysEmpty()
+    {
+        Assert.That(ImportedFieldsTable.NormalizeValue(null), Is.EqualTo(string.Empty));
+        Assert.That(ImportedFieldsTable.NormalizeValue("  "), Is.EqualTo(string.Empty));
+    }
+
+    [Test]
+    public void Merge_IncomingWins_AndAppendsNewFields()
+    {
+        var existing = """
+            Freeform note
+
+            ## Imported fields
+
+            | Field | Value |
+            | --- | --- |
+            | Interview Time | 1:00-1:15 |
+            | Application | Yes |
+            """;
+
+        var result = ImportedFieldsTable.Merge(existing,
+        [
+            new ImportedField("Interview Time", "3:20-3:35"),
+            new ImportedField("Teacher Rec 1", "Fuqua")
+        ]);
+
+        Assert.That(result.Changed, Is.True);
+        Assert.That(result.Changes, Has.Count.EqualTo(2));
+        var fields = ImportedFieldsTable.ParseFields(result.Markdown);
+        Assert.That(fields.Single(f => f.Name == "Interview Time").Value, Is.EqualTo("3:20-3:35"));
+        Assert.That(fields.Single(f => f.Name == "Application").Value, Is.EqualTo("Yes"));
+        Assert.That(fields.Single(f => f.Name == "Teacher Rec 1").Value, Is.EqualTo("Fuqua"));
+        Assert.That(result.Markdown, Does.Contain("Freeform note"));
+    }
+
+    [Test]
+    public void Merge_SameDataTwice_IsNoOp()
+    {
+        var first = ImportedFieldsTable.Merge(null,
+        [
+            new ImportedField("Interview Time", "3:20-3:35"),
+            new ImportedField("Application", "x")
+        ]);
+
+        Assert.That(first.Changed, Is.True);
+        Assert.That(ImportedFieldsTable.ParseFields(first.Markdown).Single(f => f.Name == "Application").Value, Is.EqualTo("Yes"));
+
+        var second = ImportedFieldsTable.Merge(first.Markdown,
+        [
+            new ImportedField("Interview Time", "3:20-3:35"),
+            new ImportedField("Application", "x")
+        ]);
+
+        Assert.That(second.Changed, Is.False);
+        Assert.That(second.Changes, Is.Empty);
+        Assert.That(ImportedFieldsTable.ParseFields(second.Markdown), Is.EqualTo(ImportedFieldsTable.ParseFields(first.Markdown)));
+    }
+
+    [Test]
+    public void GetFieldValue_ReadsImportedTable()
+    {
+        var markdown = ImportedFieldsTable.FormatSection(
+        [
+            new ImportedField("Interview Time", "3:20-3:35")
+        ]);
+
+        Assert.That(ImportedFieldsTable.GetFieldValue(markdown, "Interview Time"), Is.EqualTo("3:20-3:35"));
+        Assert.That(ImportedFieldsTable.GetFieldValue(markdown, "Application"), Is.Null);
+    }
+
+    [Test]
+    public void Merge_PreservesTextAfterSection()
+    {
+        var existing = """
+            ## Imported fields
+
+            | Field | Value |
+            | --- | --- |
+            | Application | Yes |
+
+            ## Advisor comments
+
+            Great interview.
+            """;
+
+        var result = ImportedFieldsTable.Merge(existing, [new ImportedField("Application", "Yes")]);
+        Assert.That(result.Changed, Is.False);
+        Assert.That(result.Markdown, Does.Contain("## Advisor comments"));
+        Assert.That(result.Markdown, Does.Contain("Great interview."));
+    }
+
+    [Test]
+    public void ParseFields_KeepsBlankValues()
+    {
+        var markdown = ImportedFieldsTable.FormatSection(
+        [
+            new ImportedField("Application", "Yes"),
+            new ImportedField("Teacher Rec 3", "")
+        ]);
+
+        var fields = ImportedFieldsTable.ParseFields(markdown);
+        Assert.That(fields.Single(f => f.Name == "Teacher Rec 3").Value, Is.EqualTo(string.Empty));
+        Assert.That(ImportedFieldsTable.GetFieldValue(markdown, "Teacher Rec 3"), Is.EqualTo(string.Empty));
+    }
+
+    [Test]
+    public void Merge_BlankFields_SameDataTwice_IsNoOp()
+    {
+        var first = ImportedFieldsTable.Merge(null,
+        [
+            new ImportedField("Interview Time", "3:20-3:35"),
+            new ImportedField("Teacher Rec 3", "")
+        ]);
+
+        Assert.That(first.Changed, Is.True);
+        Assert.That(ImportedFieldsTable.ParseFields(first.Markdown), Has.Count.EqualTo(2));
+
+        var second = ImportedFieldsTable.Merge(first.Markdown,
+        [
+            new ImportedField("Interview Time", "3:20-3:35"),
+            new ImportedField("Teacher Rec 3", "")
+        ]);
+
+        Assert.That(second.Changed, Is.False);
+        Assert.That(second.Changes, Is.Empty);
+    }
+
+    [Test]
+    public void Merge_IncomingBlank_ClearsExistingValue()
+    {
+        var existing = ImportedFieldsTable.Merge(null, [new ImportedField("Teacher Rec 1", "Fuqua")]).Markdown;
+        var result = ImportedFieldsTable.Merge(existing, [new ImportedField("Teacher Rec 1", "")]);
+
+        Assert.That(result.Changed, Is.True);
+        Assert.That(ImportedFieldsTable.GetFieldValue(result.Markdown, "Teacher Rec 1"), Is.EqualTo(string.Empty));
+    }
+
+    [Test]
+    public void GetFieldValue_IsCaseInsensitive()
+    {
+        var markdown = ImportedFieldsTable.FormatSection([new ImportedField("Interview Time", "3:20-3:35")]);
+        Assert.That(ImportedFieldsTable.GetFieldValue(markdown, "interview time"), Is.EqualTo("3:20-3:35"));
+    }
+
+    [Test]
+    public void DistinctFieldNames_UnionsNotes_AndKeepsFirstCasing()
+    {
+        var first = ImportedFieldsTable.FormatSection(
+        [
+            new ImportedField("Interview Time", "3:20-3:35"),
+            new ImportedField("Application", "Yes")
+        ]);
+        var second = ImportedFieldsTable.FormatSection(
+        [
+            new ImportedField("application", "Yes"),
+            new ImportedField("Teacher Rec 1", "Fuqua")
+        ]);
+
+        var names = ImportedFieldsTable.DistinctFieldNames([first, second, null, ""]);
+
+        Assert.That(names, Is.EqualTo(new[] { "Application", "Interview Time", "Teacher Rec 1" }));
+    }
+}