refactor: extract interfaces to Interfaces folders and consolidate filters

Move interface declarations into per-area Interfaces/ subfolders, merge the
small task-list filter classes into StatusFilter/SmartFlagFilter, and simplify
related services, converters and hub DTO handling.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/ClaudeDo.Data/Filtering/Filters/ImportantFilter.cs

@@ -1,12 +0,0 @@
-using ClaudeDo.Data.Models;
-using TaskStatus = ClaudeDo.Data.Models.TaskStatus;
-
-namespace ClaudeDo.Data.Filtering.Filters;
-
-public sealed class ImportantFilter : ITaskListFilter
-{
-    public string Id => "smart:important";
-    public bool Matches(TaskEntity t) => t.IsStarred;
-    public bool ShouldCount(TaskEntity t) => t.IsStarred && t.Status != TaskStatus.Done;
-    public bool MatchesAsContext(TaskEntity t, IReadOnlyList<TaskEntity> all) => false;
-}

src/ClaudeDo.Data/Filtering/Filters/MyDayFilter.cs

@@ -1,12 +0,0 @@
-using ClaudeDo.Data.Models;
-using TaskStatus = ClaudeDo.Data.Models.TaskStatus;
-
-namespace ClaudeDo.Data.Filtering.Filters;
-
-public sealed class MyDayFilter : ITaskListFilter
-{
-    public string Id => "smart:my-day";
-    public bool Matches(TaskEntity t) => t.IsMyDay;
-    public bool ShouldCount(TaskEntity t) => t.IsMyDay && t.Status != TaskStatus.Done;
-    public bool MatchesAsContext(TaskEntity t, IReadOnlyList<TaskEntity> all) => false;
-}

src/ClaudeDo.Data/Filtering/Filters/PlannedFilter.cs

@@ -1,12 +0,0 @@
-using ClaudeDo.Data.Models;
-using TaskStatus = ClaudeDo.Data.Models.TaskStatus;
-
-namespace ClaudeDo.Data.Filtering.Filters;
-
-public sealed class PlannedFilter : ITaskListFilter
-{
-    public string Id => "smart:planned";
-    public bool Matches(TaskEntity t) => t.ScheduledFor != null;
-    public bool ShouldCount(TaskEntity t) => t.ScheduledFor != null && t.Status != TaskStatus.Done;
-    public bool MatchesAsContext(TaskEntity t, IReadOnlyList<TaskEntity> all) => false;
-}

src/ClaudeDo.Data/Filtering/Filters/QueuedFilter.cs

@@ -1,14 +0,0 @@
-using ClaudeDo.Data.Models;
-using TaskStatus = ClaudeDo.Data.Models.TaskStatus;
-
-namespace ClaudeDo.Data.Filtering.Filters;
-
-public sealed class QueuedFilter : ITaskListFilter
-{
-    public string Id => "virtual:queued";
-    public bool Matches(TaskEntity t) => t.Status == TaskStatus.Queued;
-    public bool ShouldCount(TaskEntity t) => t.Status == TaskStatus.Queued;
-    public bool MatchesAsContext(TaskEntity t, IReadOnlyList<TaskEntity> all) =>
-        PlanningRules.IsPlanningParent(t) &&
-        PlanningRules.HasMatchingChild(t, all, c => c.Status == TaskStatus.Queued);
-}

src/ClaudeDo.Data/Filtering/Filters/RunningFilter.cs

@@ -1,14 +0,0 @@
-using ClaudeDo.Data.Models;
-using TaskStatus = ClaudeDo.Data.Models.TaskStatus;
-
-namespace ClaudeDo.Data.Filtering.Filters;
-
-public sealed class RunningFilter : ITaskListFilter
-{
-    public string Id => "virtual:running";
-    public bool Matches(TaskEntity t) => t.Status == TaskStatus.Running;
-    public bool ShouldCount(TaskEntity t) => t.Status == TaskStatus.Running;
-    public bool MatchesAsContext(TaskEntity t, IReadOnlyList<TaskEntity> all) =>
-        PlanningRules.IsPlanningParent(t) &&
-        PlanningRules.HasMatchingChild(t, all, c => c.Status == TaskStatus.Running);
-}

src/ClaudeDo.Data/Filtering/Filters/SmartFlagFilter.cs

@@ -0,0 +1,16 @@
+using ClaudeDo.Data.Models;
+using TaskStatus = ClaudeDo.Data.Models.TaskStatus;
+
+namespace ClaudeDo.Data.Filtering.Filters;
+
+/// <summary>
+/// Filter for a smart list keyed off a boolean/nullable task flag
+/// (My Day, Important, Planned). Counts only non-done matches.
+/// </summary>
+public sealed class SmartFlagFilter(string id, Func<TaskEntity, bool> flag) : ITaskListFilter
+{
+    public string Id => id;
+    public bool Matches(TaskEntity t) => flag(t);
+    public bool ShouldCount(TaskEntity t) => flag(t) && t.Status != TaskStatus.Done;
+    public bool MatchesAsContext(TaskEntity t, IReadOnlyList<TaskEntity> all) => false;
+}

src/ClaudeDo.Data/Filtering/Filters/StatusFilter.cs

@@ -0,0 +1,18 @@
+using ClaudeDo.Data.Models;
+using TaskStatus = ClaudeDo.Data.Models.TaskStatus;
+
+namespace ClaudeDo.Data.Filtering.Filters;
+
+/// <summary>
+/// Virtual list filter matching tasks by a single status (Queued, Running).
+/// Planning parents appear contextually when they host a matching child.
+/// </summary>
+public sealed class StatusFilter(string id, TaskStatus status) : ITaskListFilter
+{
+    public string Id => id;
+    public bool Matches(TaskEntity t) => t.Status == status;
+    public bool ShouldCount(TaskEntity t) => t.Status == status;
+    public bool MatchesAsContext(TaskEntity t, IReadOnlyList<TaskEntity> all) =>
+        PlanningRules.IsPlanningParent(t) &&
+        PlanningRules.HasMatchingChild(t, all, c => c.Status == status);
+}

src/ClaudeDo.Data/Filtering/TaskListFilterRegistry.cs

@@ -1,4 +1,5 @@
 using ClaudeDo.Data.Filtering.Filters;
+using TaskStatus = ClaudeDo.Data.Models.TaskStatus;
 
 namespace ClaudeDo.Data.Filtering;
 
@@ -14,11 +15,11 @@ public sealed class TaskListFilterRegistry
     private static readonly IReadOnlyDictionary<string, ITaskListFilter> BuiltIn =
         new Dictionary<string, ITaskListFilter>(StringComparer.Ordinal)
         {
-            ["smart:my-day"]    = new MyDayFilter(),
-            ["smart:important"] = new ImportantFilter(),
-            ["smart:planned"]   = new PlannedFilter(),
-            ["virtual:queued"]  = new QueuedFilter(),
-            ["virtual:running"] = new RunningFilter(),
+            ["smart:my-day"]    = new SmartFlagFilter("smart:my-day", t => t.IsMyDay),
+            ["smart:important"] = new SmartFlagFilter("smart:important", t => t.IsStarred),
+            ["smart:planned"]   = new SmartFlagFilter("smart:planned", t => t.ScheduledFor != null),
+            ["virtual:queued"]  = new StatusFilter("virtual:queued", TaskStatus.Queued),
+            ["virtual:running"] = new StatusFilter("virtual:running", TaskStatus.Running),
             ["virtual:review"]  = new ReviewFilter(),
         };