feat(app-crm): demo categoryGranularity month-bucketing on Pipeline Trend

Switch the Pipeline Trend line chart from a 90-day window with raw-
timestamp grouping (rendered flat at y=1 because each seed record has
a unique close_date) to a 12-month window bucketed by close-month
with a previous-year compareTo overlay. Showcases the new
`categoryGranularity` widget property delivering real Y-axis
variation across the seed dataset.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: os-zhuang

examples/app-crm/dist/objectstack.json

@@ -600,20 +600,19 @@
         },
         {
           "id": "pipeline_trend_90d",
-          "title": "Pipeline Trend (90d)",
-          "description": "Daily count of opportunities created in the last 90 days, with a sliding overlay of the prior 90-day window.",
+          "title": "Pipeline Trend (12 months)",
+          "description": "Opportunity count bucketed by close-month for the last year, with a sliding overlay of the prior year for compareTo.",
           "type": "line",
           "object": "crm_opportunity",
           "filter": {
             "close_date": {
-              "$gte": "{90_days_ago}",
+              "$gte": "{1_years_ago}",
               "$lte": "{today}"
             }
           },
-          "compareTo": {
-            "offset": "90d"
-          },
+          "compareTo": "previousYear",
           "categoryField": "close_date",
+          "categoryGranularity": "month",
           "aggregate": "count",
           "layout": {
             "x": 0,

examples/app-crm/src/dashboards/pipeline.dashboard.ts

@@ -82,16 +82,16 @@ export const PipelineDashboard: Dashboard = {
     {
       id: 'pipeline_trend_90d',
       type: 'line',
-      title: 'Pipeline Trend (90d)',
-      description: 'Daily count of opportunities created in the last 90 days, with a sliding overlay of the prior 90-day window.',
+      title: 'Pipeline Trend (12 months)',
+      description: 'Opportunity count bucketed by close-month for the last year, with a sliding overlay of the prior year for compareTo.',
       object: 'crm_opportunity',
       aggregate: 'count',
       categoryField: 'close_date',
-      categoryGranularity: 'day',
+      categoryGranularity: 'month',
       filter: {
-        close_date: { $gte: '{90_days_ago}', $lte: '{today}' },
+        close_date: { $gte: '{1_years_ago}', $lte: '{today}' },
       },
-      compareTo: { offset: '90d' },
+      compareTo: 'previousYear',
       layout: { x: 0, y: 2, w: 8, h: 4 },
     },
     {