feat: unify income payment cards and drop period comparisons (WealthLedger/main#33)

- income page renders only selected-period totals and payments; the
  comparison blocks, notices and display-only percentage math removed
- new shared PayoutCard presents executed payouts, forecasts and
  per-security schedules with explicit money semantics
- ledger rows, upcoming events, stock dividends and bond coupons use
  the same card; period filter lost its duplicated paper wrapper

src/shared/api/spec/openapi.json

@@ -6706,47 +6706,6 @@
           "meta"
         ]
       },
-      "IncomeComparisonCurrencyDto": {
-        "type": "object",
-        "properties": {
-          "currency": {
-            "type": "string"
-          },
-          "selected": {
-            "$ref": "#/components/schemas/IncomeCurrencySummaryDto"
-          },
-          "compared": {
-            "$ref": "#/components/schemas/IncomeCurrencySummaryDto"
-          },
-          "difference": {
-            "$ref": "#/components/schemas/IncomeCurrencySummaryDto"
-          }
-        },
-        "required": [
-          "currency",
-          "selected",
-          "compared",
-          "difference"
-        ]
-      },
-      "IncomeComparisonDto": {
-        "type": "object",
-        "properties": {
-          "period": {
-            "$ref": "#/components/schemas/IncomePeriodDto"
-          },
-          "totalsByCurrency": {
-            "type": "array",
-            "items": {
-              "$ref": "#/components/schemas/IncomeComparisonCurrencyDto"
-            }
-          }
-        },
-        "required": [
-          "period",
-          "totalsByCurrency"
-        ]
-      },
       "IncomeBucketDto": {
         "type": "object",
         "properties": {
@@ -6948,24 +6907,6 @@
             "type": "string",
             "format": "date-time"
           },
-          "previous": {
-            "nullable": true,
-            "type": "object",
-            "allOf": [
-              {
-                "$ref": "#/components/schemas/IncomeComparisonDto"
-              }
-            ]
-          },
-          "yearComparison": {
-            "nullable": true,
-            "type": "object",
-            "allOf": [
-              {
-                "$ref": "#/components/schemas/IncomeComparisonDto"
-              }
-            ]
-          },
           "bucketGranularity": {
             "type": "string",
             "enum": [
@@ -6998,8 +6939,6 @@
           "period",
           "totalsByCurrency",
           "calculatedAt",
-          "previous",
-          "yearComparison",
           "bucketGranularity",
           "buckets",
           "instruments",
@@ -7056,9 +6995,7 @@
           "role": {
             "type": "string",
             "enum": [
-              "selected",
-              "previous",
-              "year"
+              "selected"
             ]
           }
         },