Add global sync summary component for all providers (#588)

* Add shared sync statistics collection and provider sync summary UI

- Introduced `SyncStats::Collector` concern to centralize sync statistics logic, including account, transaction, holdings, and health stats collection.
- Added collapsible `ProviderSyncSummary` component for displaying sync summaries across providers.
- Updated syncers (e.g., `LunchflowItem::Syncer`) to use the shared collector methods for consistent stats calculation.
- Added rake tasks under `dev:sync_stats` for testing and development purposes, including fake stats generation with optional issues.
- Enhanced provider-specific views to include sync summaries using the new shared component.

* Refactor `ProviderSyncSummary` to improve maintainability

- Extracted `severity_color_class` to simplify severity-to-CSS mapping.
- Replaced `holdings_label` with `holdings_label_key` for streamlined localization.
- Updated locale file to separate `found` and `processed` translations for clarity.

---------

Signed-off-by: Juan José Mata <juanjo.mata@gmail.com>
Co-authored-by: Josh Waldrep <joshua.waldrep5+github@gmail.com>
Co-authored-by: Juan José Mata <juanjo.mata@gmail.com>

config/locales/views/components/en.yml

@@ -0,0 +1,29 @@
+---
+en:
+  provider_sync_summary:
+    title: Sync summary
+    last_sync: "Last sync: %{time_ago} ago"
+    accounts:
+      title: Accounts
+      total: "Total: %{count}"
+      linked: "Linked: %{count}"
+      unlinked: "Unlinked: %{count}"
+      institutions: "Institutions: %{count}"
+    transactions:
+      title: Transactions
+      seen: "Seen: %{count}"
+      imported: "Imported: %{count}"
+      updated: "Updated: %{count}"
+      skipped: "Skipped: %{count}"
+    holdings:
+      title: Holdings
+      found: "Found: %{count}"
+      processed: "Processed: %{count}"
+    health:
+      title: Health
+      rate_limited: "Rate limited %{time_ago}"
+      recently: recently
+      errors: "Errors: %{count}"
+      data_warnings: "Data warnings: %{count}"
+      notices: "Notices: %{count}"
+      view_data_quality: View data quality details