Add pending transaction handling and duplicate reconciliation logic (#602)

* Add pending transaction handling and duplicate reconciliation logic

- Implemented logic to exclude pending transactions from budgets and analytics calculations.
- Introduced mechanisms for reconciling pending transactions with posted versions.
- Added duplicate detection with support for merging or dismissing matches.
- Updated transaction search filters to include a `status_filter` for pending/confirmed transactions.
- Introduced UI elements for reviewing and resolving duplicates.
- Enhanced `ProviderSyncSummary` with stats for reconciled and stale pending transactions.

* Refactor translation handling and enhance transaction and sync logic

- Moved hardcoded strings to locale files for improved translation support.
- Refined styling for duplicate transaction indicators and sync summaries.
- Improved logic for excluding stale pending transactions and updating timestamps on batch exclusion.
- Added unique IDs to status filters for better element targeting in UI.
- Optimized database queries to avoid N+1 issues in stale pending calculations.

* Add sync settings and enhance pending transaction handling

- Introduced a new "Sync Settings" section in hosting settings with UI to toggle inclusion of pending transactions.
- Updated handling of pending transactions with improved inference logic for `posted=0` and `transacted_at` in processors.
- Added priority order for pending transaction inclusion: explicit argument > environment variable > runtime configurable setting.
- Refactored settings and controllers to store updated sync preferences.

* Refactor sync settings and pending transaction reconciliation

- Extracted logic for pending transaction reconciliation, stale exclusion, and unmatched tracking into dedicated methods for better maintainability.
- Updated sync settings to infer defaults from multiple provider environment variables (`SIMPLEFIN_INCLUDE_PENDING`, `PLAID_INCLUDE_PENDING`).
- Refined UI and messaging to handle multi-provider configurations in sync settings.

# Conflicts:
#	app/models/simplefin_item/importer.rb

* Debounce transaction reconciliation during imports

- Added per-run reconciliation debouncing to prevent repeated scans for the same account during chunked history imports.
- Trimmed size of reconciliation stats to retain recent details only.
- Introduced error tracking for reconciliation steps to improve UI visibility of issues.

* Apply ABS() in pending transaction queries and improve error handling

- Updated pending transaction logic to use ABS() for consistent handling of negative amounts.
- Adjusted amount bounds calculations to ensure accuracy for both positive and negative values.
- Refined exception handling in `merge_duplicate` to log failures and update user alert.
- Replaced `Date.today` with `Date.current` in tests to ensure timezone consistency.
- Minor optimization to avoid COUNT queries by loading limited records directly.

* Improve error handling in duplicate suggestion and dismissal logic

- Added exception handling for `store_duplicate_suggestion` to log failures and prevent crashes during fuzzy/low-confidence matches.
- Enhanced `dismiss_duplicate` action to handle `ActiveRecord::RecordInvalid` and display appropriate user alerts.

---------

Co-authored-by: Josh Waldrep <joshua.waldrep5+github@gmail.com>

app/components/provider_sync_summary.html.erb

@@ -69,6 +69,102 @@
           <% end %>
         </div>
 
+        <%# Pending→posted reconciliation %>
+        <% if has_pending_reconciled? %>
+          <div class="mt-1">
+            <div class="flex items-center gap-1">
+              <%= helpers.icon "check-circle", size: "sm", color: "success" %>
+              <span class="text-success"><%= t("provider_sync_summary.health.pending_reconciled", count: pending_reconciled) %></span>
+            </div>
+            <% if pending_reconciled_details.any? %>
+              <details class="mt-1">
+                <summary class="text-xs cursor-pointer text-secondary hover:text-primary">
+                  <%= t("provider_sync_summary.health.view_reconciled") %>
+                </summary>
+                <div class="mt-1 pl-2 border-l-2 border-surface-inset space-y-1">
+                  <% pending_reconciled_details.each do |detail| %>
+                    <p class="text-xs text-success">
+                      <%= detail["account_name"] %>: <%= detail["pending_name"] %>
+                    </p>
+                  <% end %>
+                </div>
+              </details>
+            <% end %>
+          </div>
+        <% end %>
+
+        <%# Duplicate suggestions needing review %>
+        <% if has_duplicate_suggestions_created? %>
+          <div class="mt-1">
+            <div class="flex items-center gap-1">
+              <%= helpers.icon "alert-triangle", size: "sm", color: "warning" %>
+              <span class="text-warning"><%= t("provider_sync_summary.health.duplicate_suggestions", count: duplicate_suggestions_created) %></span>
+            </div>
+            <% if duplicate_suggestions_details.any? %>
+              <details class="mt-1">
+                <summary class="text-xs cursor-pointer text-secondary hover:text-primary">
+                  <%= t("provider_sync_summary.health.view_duplicate_suggestions") %>
+                </summary>
+                <div class="mt-1 pl-2 border-l-2 border-surface-inset space-y-1">
+                  <% duplicate_suggestions_details.each do |detail| %>
+                    <p class="text-xs text-warning">
+                      <%= detail["account_name"] %>: <%= detail["pending_name"] %> → <%= detail["posted_name"] %>
+                    </p>
+                  <% end %>
+                </div>
+              </details>
+            <% end %>
+          </div>
+        <% end %>
+
+        <%# Stale pending transactions (auto-excluded) %>
+        <% if has_stale_pending? %>
+          <div class="mt-1">
+            <div class="flex items-center gap-1">
+              <%= helpers.icon "clock", size: "sm", color: "warning" %>
+              <span class="text-warning"><%= t("provider_sync_summary.health.stale_pending", count: stale_pending_excluded) %></span>
+            </div>
+            <% if stale_pending_details.any? %>
+              <details class="mt-1">
+                <summary class="text-xs cursor-pointer text-secondary hover:text-primary">
+                  <%= t("provider_sync_summary.health.view_stale_pending") %>
+                </summary>
+                <div class="mt-1 pl-2 border-l-2 border-surface-inset space-y-1">
+                  <% stale_pending_details.each do |detail| %>
+                    <p class="text-xs text-warning">
+                      <%= detail["account_name"] %>: <%= t("provider_sync_summary.health.stale_pending_count", count: detail["count"]) %>
+                    </p>
+                  <% end %>
+                </div>
+              </details>
+            <% end %>
+          </div>
+        <% end %>
+
+        <%# Stale unmatched pending (need manual review) %>
+        <% if has_stale_unmatched_pending? %>
+          <div class="mt-1">
+            <div class="flex items-center gap-1">
+              <%= helpers.icon "help-circle", size: "sm" %>
+              <span class="text-secondary"><%= t("provider_sync_summary.health.stale_unmatched", count: stale_unmatched_pending) %></span>
+            </div>
+            <% if stale_unmatched_details.any? %>
+              <details class="mt-1">
+                <summary class="text-xs cursor-pointer text-secondary hover:text-primary">
+                  <%= t("provider_sync_summary.health.view_stale_unmatched") %>
+                </summary>
+                <div class="mt-1 pl-2 border-l-2 border-surface-inset space-y-1">
+                  <% stale_unmatched_details.each do |detail| %>
+                    <p class="text-xs text-secondary">
+                      <%= detail["account_name"] %>: <%= t("provider_sync_summary.health.stale_unmatched_count", count: detail["count"]) %>
+                    </p>
+                  <% end %>
+                </div>
+              </details>
+            <% end %>
+          </div>
+        <% end %>
+
         <%# Data quality warnings %>
         <% if has_data_quality_issues? %>
           <div class="flex items-center gap-3 mt-1">