feat: Enhance holding detail drawer with live price sync and enriched overview (#1086)

* Feat: Implement manual sync prices functionality and enhance holdings display

* Feat: Enhance sync prices functionality with error handling and update UI components

* Feat: Update sync prices error handling and enhance Spanish locale messages

* Fix: Address CodeRabbit review feedback

- Set fallback @provider_error when prices_updated == 0 so turbo stream
  never fails silently without a visible error message
- Move attr_reader :provider_error to class header in Price::Importer
  for conventional placement alongside other attribute declarations
- Precompute @last_price_updated in controller (show + sync_prices)
  instead of running a DB query directly inside ERB templates

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Fix: Replace bare rescue with explicit exception handling in turbo stream view

Bare `rescue` silently swallows all exceptions, making debugging impossible.
Match the pattern already used in show.html.erb: rescue ActiveRecord::RecordInvalid
explicitly, then catch StandardError with logging (message + backtrace) before
falling back to the unknown label.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Fix: Update test assertion to expect actual provider error message

The stub returns "Yahoo Finance rate limit exceeded" as the provider error.
After the @provider_error fallback fix, the controller now correctly surfaces
the real provider error when present (using .presence || fallback), so the
flash[:alert] is the actual error string, not the generic fallback.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* Fix: Assert scoped security_ids in sync_prices materializer test

Replace loose stub with constructor expectation to verify that
Balance::Materializer is instantiated with the single-security scope.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Fix: Assert holding remap in remap_security test

Add assertion that @holding.security_id is updated to the target
security after remap, covering the core command outcome.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Fix: CI test failure - Update disconnect external assistant test to use env overrides

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

app/models/security/price/importer.rb

@@ -4,6 +4,8 @@ class Security::Price::Importer
 
   PROVISIONAL_LOOKBACK_DAYS = 7
 
+  attr_reader :provider_error
+
   def initialize(security:, security_provider:, start_date:, end_date:, clear_cache: false)
     @security          = security
     @security_provider = security_provider
@@ -130,6 +132,7 @@ class Security::Price::Importer
             scope.set_context("security", { id: security.id, start_date: start_date, end_date: end_date })
           end
 
+          @provider_error = error_message
           {}
         end
       end

app/models/security/provided.rb

@@ -114,13 +114,14 @@ module Security::Provided
       return 0
     end
 
-    Security::Price::Importer.new(
+    importer = Security::Price::Importer.new(
       security: self,
       security_provider: provider,
       start_date: start_date,
       end_date: end_date,
       clear_cache: clear_cache
-    ).import_provider_prices
+    )
+    [ importer.import_provider_prices, importer.provider_error ]
   end
 
   private