Implement Indexa Capital provider with real API integration (#933)

* Add Indexa Capital provider scaffold

Generate Indexa Capital provider scaffolding and align credential fields with the API authentication requirements.

* Fix PR 926 lint and schema CI failures

* Implement Indexa Capital provider with real API integration

- Rewrite all broken view templates (were meta-ERB from code generator)
- Create missing select_accounts.html.erb template
- Implement real API calls: list_accounts via /users/me, get_holdings
  via /accounts/{number}/fiscal-results, get_account_balance via
  /accounts/{number}/performance
- Add API token auth support (stored token > env token > credentials)
- Add api_token column with encryption support
- Redesign settings panel: API token prominent, credentials collapsible
- Fix account balances display using performance endpoint portfolios
- Fix accounts index empty-state guard missing indexa_capital_items
- Simplify activities fetch job (no activities API endpoint exists)
- Fix i18n interpolation (%%{ -> %{) throughout locale file

* Add tests for Indexa Capital provider integration

- IndexaCapitalItemTest: validations, credentials, scopes, sync status
- IndexaCapitalAccountTest: upsert, holdings, account provider linking
- Provider::IndexaCapitalTest: auth modes, API stubs, error handling
- IndexaCapitalItemsControllerTest: CRUD, setup, linking, authorization
- Fixtures for items (token + credentials) and accounts (mutual + pension)

52 tests, 98 assertions, 0 failures

* Address code review feedback from PR #933

- Fix zero balance bug: use `nil?` instead of `present?` so 0 is stored
- Fix has_indexa_capital_credentials? to check api_token (was ignored)
- Fix build_provider to delegate to Provided concern (was ignoring token)
- Fix IndexaCapital section outside encryption_error guard in settings
- Add account_number sanitization to prevent path traversal in API URLs
- Replace all skipped processor tests with real working tests
- Add zero-balance and path-traversal test coverage

61 tests, 107 assertions, 0 failures

* Address code review round 2: credentials validation, RuboCop, test quality

- Fix RuboCop SpaceInsideArrayLiteralBrackets in credentials check
- Chain where.not calls so all three username/document/password must be present
- Require all three credentials (||) instead of any one (&&) in validate_configuration!
- Move attr_reader to private to avoid exposing credentials publicly
- Parse dates with Date.parse in extract_balance for robustness
- Remove stale TODO and Crypto from supported_account_types
- Order build_provider query deterministically by created_at
- Replace no-op holdings assertion with meaningful assert_difference

* Address code review round 3: JSON parse safety and test precision

- Rescue JSON::ParserError on 2xx responses for clearer error messages
- Fix weak balance assertion: set balance to 0 before processing, assert
  expected value (27093.01 = sum of holdings amounts)

* Include Indexa Capital in automatic family sync

Add indexa_capital_items to Family::Syncer#child_syncables so balances
and holdings refresh on daily auto-sync and login sync, not only on
manual sync button clicks.

---------

Signed-off-by: Juan José Mata <juanjo.mata@gmail.com>
Co-authored-by: Juan José Mata <jjmata@jjmata.com>
Co-authored-by: Juan José Mata <juanjo.mata@gmail.com>

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.2].define(version: 2026_02_03_204605) do
+ActiveRecord::Schema[7.2].define(version: 2026_02_07_231945) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "pgcrypto"
   enable_extension "plpgsql"
@@ -668,6 +668,57 @@ ActiveRecord::Schema[7.2].define(version: 2026_02_03_204605) do
     t.index ["family_id"], name: "index_imports_on_family_id"
   end
 
+  create_table "indexa_capital_accounts", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
+    t.uuid "indexa_capital_item_id", null: false
+    t.string "name"
+    t.string "indexa_capital_account_id"
+    t.string "account_number"
+    t.string "currency"
+    t.decimal "current_balance", precision: 19, scale: 4
+    t.string "account_status"
+    t.string "account_type"
+    t.string "provider"
+    t.jsonb "institution_metadata"
+    t.jsonb "raw_payload"
+    t.string "indexa_capital_authorization_id"
+    t.decimal "cash_balance", precision: 19, scale: 4, default: "0.0"
+    t.jsonb "raw_holdings_payload", default: []
+    t.jsonb "raw_activities_payload", default: []
+    t.datetime "last_holdings_sync"
+    t.datetime "last_activities_sync"
+    t.boolean "activities_fetch_pending", default: false
+    t.date "sync_start_date"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["indexa_capital_account_id"], name: "index_indexa_capital_accounts_on_indexa_capital_account_id", unique: true
+    t.index ["indexa_capital_authorization_id"], name: "idx_on_indexa_capital_authorization_id_58db208d52"
+    t.index ["indexa_capital_item_id"], name: "index_indexa_capital_accounts_on_indexa_capital_item_id"
+  end
+
+  create_table "indexa_capital_items", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
+    t.uuid "family_id", null: false
+    t.string "name"
+    t.string "institution_id"
+    t.string "institution_name"
+    t.string "institution_domain"
+    t.string "institution_url"
+    t.string "institution_color"
+    t.string "status", default: "good"
+    t.boolean "scheduled_for_deletion", default: false
+    t.boolean "pending_account_setup", default: false
+    t.datetime "sync_start_date"
+    t.jsonb "raw_payload"
+    t.jsonb "raw_institution_payload"
+    t.string "username"
+    t.string "document"
+    t.text "password"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.text "api_token"
+    t.index ["family_id"], name: "index_indexa_capital_items_on_family_id"
+    t.index ["status"], name: "index_indexa_capital_items_on_status"
+  end
+
   create_table "investments", id: :uuid, default: -> { "gen_random_uuid()" }, force: :cascade do |t|
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
@@ -1473,6 +1524,8 @@ ActiveRecord::Schema[7.2].define(version: 2026_02_03_204605) do
   add_foreign_key "impersonation_sessions", "users", column: "impersonator_id"
   add_foreign_key "import_rows", "imports"
   add_foreign_key "imports", "families"
+  add_foreign_key "indexa_capital_accounts", "indexa_capital_items"
+  add_foreign_key "indexa_capital_items", "families"
   add_foreign_key "invitations", "families"
   add_foreign_key "invitations", "users", column: "inviter_id"
   add_foreign_key "llm_usages", "families"