Dashboard KPI widgets: reports[].widget, custom widgets, Report Editor panel

[delchev]

Meaningful dashboard tiles instead of raw per-entity record counts, in three layers:

reports[].widget — KPI tiles backed by reports

reports:
  - name: OverdueInvoices
    source: Invoice
    filter: "due <= CURRENT_DATE AND balance > 0"
    widget: { kind: count, label: Overdue Invoices, icon: alert-triangle }
  - name: RevenueByMonth
    dimensions: ["month(date)"]
    measures: ["sum(total)"]
    widget:
      value: "sum(total)"
      at: { "month(date)": now }     # type-aware token: current YYYYMM
      label: Revenue (this month)

• kind: count — the report's record count; value — one aggregate cell (at pins dimensions via the existing typed-conditions filter; now resolves client-side: month(x) → current YYYYMM, year(x) → current year, date → today); list — the first limit rows as a mini table.
• No new SQL machinery, endpoints, or file extensions: ReportIntentGenerator resolves authored expressions to the report's own column aliases into a widget block on the .report; the runtime is the existing generated report controller, fetched by the shared reports store (loadWidgetValue; 403 hides the tile for role-guarded reports).

Top-level widgets: — the custom escape hatch

kind: kpi is a number tile fed by a developer REST endpoint returning {value, description?} (value may be a display string like "99.9%"); kind: page embeds an HTML page like a report preview tile. The kind implies how the same-origin url is consumed — no separate source-type field.

Report Editor (Web IDE)

A new Dashboard Widget panel (enable, kind, label/icon, value-measure picker over the aggregate columns, at-pin table over the grouping columns, list limit) plus Description and Show on the home dashboard in General — hand-authored .report widgets for classic projects.

Semantics & i18n

Declared widgets flip the .model root dashboardKpis flag: the Harmonia shell bakes the entity tile list empty (no widgets → today's dashboard byte-identical), and a widget-bearing report loses its preview tile. Report + widget labels are translated end-to-end (new report-template translate source → <Name>-report catalogs; custom labels ride the model catalog; sidebar/dashboard/breadcrumb read them via displayLabel/widgetLabel).

Testing

Unit: IntentParserTest (10 widget cases), ReportIntentGeneratorTest, EdmIntentGeneratorTest. Integration: IntentEngineIT#report_widget_generates_the_kpi_block_and_replaces_entity_tiles (+ extended fixture). Verified live end-to-end on a demo project: count/value/list values over the generated controllers, the custom KPI endpoint, catalogs, entity-tile suppression and the no-widgets fallback.

Follow-ups (merge after this PR; inert on older parsers)

• Dashboard KPI widget on the MembersWithLoansDue report dirigiblelabs/sample-intent-model#5
• Dashboard KPI widgets on the sales-invoices reports dirigiblelabs/sample-intent-multi-model#10
• Document dashboard KPI widgets (reports[].widget + custom widgets) dirigible-io/dirigible-io.github.io#135 (docs)

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