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/views/simplefin_items/_simplefin_item.html.erb

@@ -104,6 +104,25 @@
               <%= icon "alert-circle", size: "sm", color: "warning" %>
               <%= tag.span stale_status[:message], class: "text-sm" %>
             </div>
+          <% elsif (pending_status = simplefin_item.stale_pending_status)[:count] > 0 %>
+            <div class="text-secondary">
+              <div class="flex items-center gap-1">
+                <%= icon "clock", size: "sm", color: "secondary" %>
+                <%= tag.span pending_status[:message], class: "text-sm" %>
+                <span class="text-xs text-tertiary"><%= t(".stale_pending_note") %></span>
+              </div>
+              <% if pending_status[:accounts]&.any? %>
+                <div class="text-xs text-tertiary ml-5">
+                  <%= t(".stale_pending_accounts", accounts: pending_status[:accounts].join(", ")) %>
+                </div>
+              <% end %>
+            </div>
+          <% elsif (reconciled_status = simplefin_item.last_sync_reconciled_status)[:count] > 0 %>
+            <div class="text-success flex items-center gap-1">
+              <%= icon "check-circle", size: "sm", color: "success" %>
+              <%= tag.span reconciled_status[:message], class: "text-sm" %>
+              <span class="text-xs text-tertiary"><%= t(".reconciled_details_note") %></span>
+            </div>
           <% elsif simplefin_item.rate_limited_message.present? %>
             <div class="text-warning flex items-center gap-1">
               <%= icon "clock", size: "sm", color: "warning" %>
@@ -117,7 +136,7 @@
           <% elsif duplicate_only_errors %>
             <div class="text-secondary flex items-center gap-1">
               <%= icon "info", size: "sm" %>
-              <%= tag.span "Some accounts were skipped as duplicates — use ‘Link existing accounts’ to merge.", class: "text-secondary" %>
+              <%= tag.span t(".duplicate_accounts_skipped"), class: "text-secondary" %>
             </div>
           <% else %>
             <p class="text-secondary">