Add Coinbase exchange integration with CDP API support (#704)

* **Add Coinbase integration with item and account management**
- Creates migrations for `coinbase_items` and `coinbase_accounts`.
- Adds models, controllers, views, and background tasks to support account linking, syncing, and transaction handling.
- Implements Coinbase API client and adapter for seamless integration.
- Supports ActiveRecord encryption for secure credential storage.
- Adds UI components for provider setup, account management, and synchronization.

* Localize Coinbase-related UI strings, refine account linking for security, and add timeouts to Coinbase API requests.

* Localize Coinbase account handling to support native currencies (USD, EUR, GBP, etc.) across balances, trades, holdings, and transactions.

* Improve Coinbase processing with timezone-safe parsing, native currency support, and immediate holdings updates.

* Improve trend percentage formatting and enhance race condition handling for Coinbase account linking.

* Fix log message wording for orphan cleanup

* Ensure `selected_accounts` parameter is sanitized by rejecting blank entries.

* Add tests for Coinbase integration: account, item, and controller coverage

- Adds unit tests for `CoinbaseAccount` and `CoinbaseItem` models.
- Adds integration tests for `CoinbaseItemsController`.
- Introduces Stimulus `select-all` controller for UI checkbox handling.
- Localizes UI strings and logging for Coinbase integration.

* Update test fixtures to use consistent placeholder API keys and secrets

* Refine `coinbase_item` tests to ensure deterministic ordering and improve scope assertions.

* Integrate `SyncStats::Collector` into Coinbase syncer to streamline statistics collection and enhance consistency.

* Localize Coinbase sync status messages and improve sync summary test coverage.

* Update `CoinbaseItem` encryption: use deterministic encryption for `api_key` and standard for `api_secret`.

* fix schema drift

* Beta labels to lower expectations

---------

Co-authored-by: luckyPipewrench <luckypipewrench@proton.me>
Co-authored-by: Juan José Mata <juanjo.mata@gmail.com>

app/controllers/accounts_controller.rb

@@ -11,6 +11,7 @@ class AccountsController < ApplicationController
     @lunchflow_items = family.lunchflow_items.ordered.includes(:syncs, :lunchflow_accounts)
     @enable_banking_items = family.enable_banking_items.ordered.includes(:syncs)
     @coinstats_items = family.coinstats_items.ordered.includes(:coinstats_accounts, :accounts, :syncs)
+    @coinbase_items = family.coinbase_items.ordered.includes(:coinbase_accounts, :accounts, :syncs)
 
     # Build sync stats maps for all providers
     build_sync_stats_maps
@@ -151,7 +152,9 @@ class AccountsController < ApplicationController
     )
 
     # Build available providers list with paths resolved for this specific account
-    @available_providers = provider_configs.map do |config|
+    # Filter out providers that don't support linking to existing accounts
+    @available_providers = provider_configs.filter_map do |config|
+      next unless config[:existing_account_path].present?
       {
         name: config[:name],
         key: config[:key],
@@ -238,5 +241,20 @@ class AccountsController < ApplicationController
         latest_sync = item.syncs.ordered.first
         @coinstats_sync_stats_map[item.id] = latest_sync&.sync_stats || {}
       end
+
+      # Coinbase sync stats
+      @coinbase_sync_stats_map = {}
+      @coinbase_unlinked_count_map = {}
+      @coinbase_items.each do |item|
+        latest_sync = item.syncs.ordered.first
+        @coinbase_sync_stats_map[item.id] = latest_sync&.sync_stats || {}
+
+        # Count unlinked accounts
+        count = item.coinbase_accounts
+          .left_joins(:account_provider)
+          .where(account_providers: { id: nil })
+          .count
+        @coinbase_unlinked_count_map[item.id] = count
+      end
     end
 end