add quick add entry.

API/ROLAC.API/DTOs/Giving/AppendOfferingLineRequest.cs

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+using System.ComponentModel.DataAnnotations;
+namespace ROLAC.API.DTOs.Giving;
+
+// Body of POST /api/offering-entry/lines — one offering line plus the date of the
+// session it belongs to (find-or-create that day's session, append the line).
+public class AppendOfferingLineRequest
+{
+    [Required] public DateOnly Date { get; set; }
+    [Required] public OfferingGivingLineRequest Line { get; set; } = new();
+}

API/ROLAC.API/DTOs/Giving/MemberTypeaheadDto.cs

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+namespace ROLAC.API.DTOs.Giving;
+
+// Minimal member fields exposed to the anonymous mobile offering-entry page —
+// just enough for the giver typeahead to render a display name (matches the
+// Angular memberDisplayName helper: NickName ?? FirstName_en, plus LastName_en).
+public class MemberTypeaheadDto
+{
+    public int     Id           { get; set; }
+    public string? NickName     { get; set; }
+    public string  FirstName_en { get; set; } = "";
+    public string  LastName_en  { get; set; } = "";
+}

API/ROLAC.API/DTOs/Giving/OfferingEntryBootstrapDto.cs

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+namespace ROLAC.API.DTOs.Giving;
+
+// One-shot payload that seeds the mobile offering-entry page: the active giving
+// categories for the Type dropdown and the current state of today's session.
+public class OfferingEntryBootstrapDto
+{
+    public string SessionDate { get; set; } = "";   // yyyy-MM-dd
+    public List<GivingCategoryDto>  Categories { get; set; } = [];
+    public OfferingEntrySummaryDto  Summary    { get; set; } = new();
+}

API/ROLAC.API/DTOs/Giving/OfferingEntryLineAddedDto.cs

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+namespace ROLAC.API.DTOs.Giving;
+
+// Returned from POST /api/offering-entry/lines and broadcast over the
+// OfferingEntryHub: the line just added plus the session's new running totals,
+// so every connected client (other phones + the desktop page) can update live.
+public class OfferingEntryLineAddedDto
+{
+    public int      SessionId   { get; set; }
+    public string   SessionDate { get; set; } = "";   // yyyy-MM-dd
+    public string   Status      { get; set; } = "";
+    public decimal  SystemTotal { get; set; }
+    public int      LineCount   { get; set; }
+    public OfferingGivingLineDto Line { get; set; } = new();
+}

API/ROLAC.API/DTOs/Giving/OfferingEntrySummaryDto.cs

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+namespace ROLAC.API.DTOs.Giving;
+
+// A day's offering session as the mobile page sees it: the running total/line
+// count plus the lines already recorded. SessionId is null when no session
+// exists for the date yet (nothing entered today).
+public class OfferingEntrySummaryDto
+{
+    public int?     SessionId   { get; set; }
+    public string   SessionDate { get; set; } = "";   // yyyy-MM-dd
+    public string?  Status      { get; set; }          // null when no session yet
+    public decimal  SystemTotal { get; set; }
+    public int      LineCount   { get; set; }
+    public List<OfferingGivingLineDto> Lines { get; set; } = [];
+}