fix: today/watch view zero-data table and midnight-aligned hourly chart

CLAUDE.md

@@ -12,6 +12,7 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 - Run WPF app (Windows-only): `dotnet run --project src/AIUsageMonitor.WPF`
 - Run tests: `dotnet test AIUsageMonitor.slnx`
   - Single test: `dotnet test tests/AIUsageMonitor.Core.Tests --filter "FullyQualifiedName~MethodName"`
+  - Tests live only under `tests/AIUsageMonitor.Core.Tests`, mirroring Core's `Analytics/` and `Providers/Claude/` folders — there are no Cli or WPF test projects.
 - Versioning is via MinVer, driven by `v*` git tags (prefix `v`); no manual version bumps in project files.
 
 ## Architecture
@@ -30,7 +31,7 @@ Provider-specific code lives under `Providers/<Name>/` and implements `Providers
 
 `Analytics/UsageAnalyzer` computes daily/period/model-distribution/hourly/session summaries from an `IUsageProvider`'s `StatsCache`, using `Analytics/CostCalculator` for token cost estimation → `Services/DataService` is the single facade over all of this, consumed by both Cli and WPF. `StatsCache` is currently Claude's own cache-file shape (`Providers/Claude/Models`); adding a second provider will require either normalizing its output to that shape or generalizing `UsageAnalyzer`'s input type.
 
-`DataService` caches the parsed `StatsCache` for 30 seconds and invalidates early via a `FileSystemWatcher` on `stats-cache.json` (Claude-provider-specific, via a type check in `DataService`'s constructor). Session-level summaries (`GetSessionSummaries`) are read fresh from the raw session files rather than the cache.
+`DataService` caches the parsed `StatsCache` for 30 seconds and invalidates early via a `FileSystemWatcher` on `stats-cache.json` (Claude-provider-specific, via a type check in `DataService`'s constructor). Session-level summaries (`GetSessionSummaries`) are read fresh from the raw session files rather than the cache. Long-running `DataService` reads accept an optional `IProgress<int>`, which the Cli surfaces as a Spectre.Console progress bar.
 
 DI is wired through `ServiceCollectionExtensions.AddClaudeUsageCore()`, which registers the Claude provider's locator/parsers, binds it as the singleton `IUsageProvider`, and registers `CostCalculator`, `UsageAnalyzer`, and `DataService`.
 

src/AIUsageMonitor.Cli/Commands/TodayCommand.cs

@@ -1,4 +1,5 @@
 using AIUsageMonitor.Cli.Rendering;
+using AIUsageMonitor.Core.Models;
 using AIUsageMonitor.Core.Services;
 using Spectre.Console;
 using System.CommandLine;
@@ -18,26 +19,15 @@ public static class TodayCommand
     public static Command Create(DataService dataService)
     {
         var command = new Command("today", "Show today's usage summary");
-        var recentHoursOption = new Option<int>("--recent-hours")
-        {
-            Description = "Trailing window (in hours) for the recent activity block",
-            DefaultValueFactory = _ => 6
-        };
-        command.Options.Add(recentHoursOption);
 
-        command.SetAction(parseResult =>
+        command.SetAction(_ =>
         {
             var summary = ProgressReporter.Run("Loading usage data...",
-                p => dataService.GetDailySummary(DateOnly.FromDateTime(DateTime.Today), p));
-            if (summary is null)
-            {
-                AnsiConsole.MarkupLine("[yellow]No data for today.[/]");
-                return 0;
-            }
+                p => dataService.GetDailySummary(DateOnly.FromDateTime(DateTime.Today), p))
+                ?? DailySummary.Empty(DateOnly.FromDateTime(DateTime.Today));
 
-            var recentHours = Math.Max(1, parseResult.GetValue(recentHoursOption));
             var recent = ProgressReporter.Run("Loading recent activity...",
-                p => dataService.GetRecentActivity(TimeSpan.FromHours(recentHours), p));
+                p => dataService.GetRecentActivity(DateTimeOffset.Now - DateTimeOffset.Now.Date, p));
 
             AnsiConsole.Write(new Rows(
                 SpectreRenderer.BuildDailySummary(summary),

src/AIUsageMonitor.Cli/Commands/WatchCommand.cs

@@ -1,4 +1,5 @@
 using AIUsageMonitor.Cli.Rendering;
+using AIUsageMonitor.Core.Models;
 using AIUsageMonitor.Core.Services;
 using Spectre.Console;
 using Spectre.Console.Rendering;
@@ -29,29 +30,22 @@ public static Command Create(DataService dataService)
             Description = "Refresh interval in seconds",
             DefaultValueFactory = _ => 2
         };
-        var recentHoursOption = new Option<int>("--recent-hours")
-        {
-            Description = "Trailing window (in hours) for the hourly token chart shown in the today view",
-            DefaultValueFactory = _ => 6
-        };
         command.Options.Add(viewOption);
         command.Options.Add(intervalOption);
-        command.Options.Add(recentHoursOption);
 
         command.SetAction(async (parseResult, ct) =>
         {
             var view = parseResult.GetValue(viewOption)!;
             var interval = Math.Max(1, parseResult.GetValue(intervalOption));
-            var recentHours = Math.Max(1, parseResult.GetValue(recentHoursOption));
 
             IRenderable BuildCurrent(IProgress<int>? progress = null) => view switch
             {
-                "today" => dataService.GetDailySummary(DateOnly.FromDateTime(DateTime.Today), progress) is { } d
-                    ? new Rows(
-                        SpectreRenderer.BuildDailySummary(d),
-                        new Rule().RuleStyle("grey"),
-                        SpectreRenderer.BuildHourlyTokenChart(dataService.GetRecentActivity(TimeSpan.FromHours(recentHours), progress).HourlyTrend))
-                    : new Markup("[yellow]No data for today.[/]"),
+                "today" => new Rows(
+                    SpectreRenderer.BuildDailySummary(
+                        dataService.GetDailySummary(DateOnly.FromDateTime(DateTime.Today), progress)
+                            ?? DailySummary.Empty(DateOnly.FromDateTime(DateTime.Today))),
+                    new Rule().RuleStyle("grey"),
+                    SpectreRenderer.BuildHourlyTokenChart(dataService.GetRecentActivity(DateTimeOffset.Now - DateTimeOffset.Now.Date, progress).HourlyTrend)),
                 "week" => SpectreRenderer.BuildPeriodSummary(
                     dataService.GetPeriodSummary(DateOnly.FromDateTime(DateTime.Today).AddDays(-6), DateOnly.FromDateTime(DateTime.Today), progress)),
                 "models" => SpectreRenderer.BuildModelDistribution(dataService.GetModelDistribution(progress)),

src/AIUsageMonitor.Core/Models/AnalyticsDtos.cs

@@ -19,7 +19,15 @@ public sealed record DailySummary(
     int ToolCalls,
     long TotalTokens,
     Dictionary<string, long> TokensByModel,
-    decimal EstimatedCost);
+    decimal EstimatedCost)
+{
+    /// <summary>
+    /// Creates a zero-valued <see cref="DailySummary"/> for a date with no recorded activity.
+    /// </summary>
+    /// <param name="date">The calendar date the summary covers.</param>
+    /// <returns>A <see cref="DailySummary"/> with all counters at zero.</returns>
+    public static DailySummary Empty(DateOnly date) => new(date, 0, 0, 0, 0, [], 0m);
+}
 
 /// <summary>
 /// Represents an aggregated summary of usage activity over a date range.