refactor: unify token usage stats across all session types (#274)

- Rewrite SQL queries to join bot_history_messages with bot_sessions,
  supporting chat/heartbeat/schedule usage from a single source
- Update Go handler and CLI command to use unified queries
- Fix daily chart stacking: each session type gets its own bar group
- Add total input/output trend lines to the daily token chart
- Fix summary cards reactivity by restricting aggregation to allDays range
- Fix cache chart reactive dependency tracking by inlining data access
- Add i18n keys for schedule, totalInput, totalOutput
- Default time range changed to 7 days
- Regenerate sqlc, swagger, and SDK

spec/swagger.json

@@ -4676,7 +4676,7 @@
         },
         "/bots/{bot_id}/token-usage": {
             "get": {
-                "description": "Get daily aggregated token usage for a bot, split by chat and heartbeat, with optional model filter and per-model breakdown",
+                "description": "Get daily aggregated token usage for a bot, split by chat, heartbeat, and schedule session types, with optional model filter and per-model breakdown",
                 "tags": [
                     "token-usage"
                 ],
@@ -11183,6 +11183,12 @@
                     "items": {
                         "$ref": "#/definitions/handlers.DailyTokenUsage"
                     }
+                },
+                "schedule": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/handlers.DailyTokenUsage"
+                    }
                 }
             }
         },
@@ -11909,11 +11915,13 @@
             "enum": [
                 "ok",
                 "auth_error",
+                "model_not_supported",
                 "error"
             ],
             "x-enum-varnames": [
                 "TestStatusOK",
                 "TestStatusAuthError",
+                "TestStatusModelNotSupported",
                 "TestStatusError"
             ]
         },