chore(docs, frontend): document and implement Web-App sync workaround for async driver issue

- Added session log documenting Web-App stabilization, including fixes for Webpack build and login issues.
- Implemented full-sync workaround in `PingEventRepositoryImpl` due to SQLDelight async driver limitations.
- Updated `PingDashboard` to display sync completion messages.
- Added `libs.sqldelight.coroutines` dependency and regenerated SQLDelight queries.
- Updated roadmap and journal with progress on frontend sync integration.

frontend/core/local-db/src/commonMain/sqldelight/at/mocode/frontend/core/localdb/AppDatabase.sq

@@ -44,5 +44,6 @@ VALUES ?;
 
 upsertPingEvent:
 -- Single-row convenience upsert (used by repositories).
+-- Force re-generation comment
 INSERT OR REPLACE INTO PingEvent(id, message, last_modified)
 VALUES (?, ?, ?);