Add novel dashboard with project phases; fix beat/chapter overflow

Dashboard replaces the tabbed overview: Outline + Characters cards
(recent-first), gated by a new Project.Phase (Brainstorming ->
Outlining -> Writing -> Editing -> Complete). Brainstorming shows just
a notes editor; existing projects backfill to Outlining. Old brief
editor moves to a Settings route.

Beat table now renders as plain readable text, turning into editable
fields only for the clicked row. Fixed horizontal overflow on the
chapters list and beat table caused by unconstrained CSS grid/table
tracks sizing to their widest unwrapped child. Widened the project
layout's max width.

src/Novelly.Api/Chapters/ChapterContracts.cs

@@ -20,7 +20,8 @@ public record ChapterSummaryResponse(
     int BeatCount,
     int SceneCount,
     int WordCount,
-    IReadOnlyList<TagResponse> Tags);
+    IReadOnlyList<TagResponse> Tags,
+    DateTimeOffset UpdatedAt);
 
 /// <summary>
 /// A chapter in full: the outline (a paragraph of summary plus an ordered beat table)
@@ -146,5 +147,6 @@ public static class ChapterMapping
         c.Id, c.ProjectId, c.Number, c.Title, c.Summary,
         c.PovCharacterId, c.PovCharacter?.Name, c.Setting, c.Status, c.TargetWordCount,
         c.Beats.Count, c.Scenes.Count, c.Scenes.Sum(s => s.WordCount),
-        [.. c.Tags.OrderBy(t => t.Name).Select(t => t.ToResponse())]);
+        [.. c.Tags.OrderBy(t => t.Name).Select(t => t.ToResponse())],
+        c.UpdatedAt);
 }