fix: standardize contact company field on company_name (#14099)

Standardizes the contact company import/filter/automation contract on
`company_name`.

Closes #14096
Revives #9907

## Why

Contact company is read across the current CRM/contact UI from
`additional_attributes['company_name']`, but CSV import and a few
backend filter/automation paths still used the older `company` key. That
meant imported company values could be saved in a place the dashboard,
sorting, filters, and automation conditions did not consistently read
from.

Based on the production data check, the legacy `company` automation
configuration is effectively dead: the affected account did not have
contacts populated with `additional_attributes['company']`. So this PR
intentionally avoids adding long-term fallback behavior and uses
`company_name` as the single key going forward.

## What changed

- Contact CSV import now writes only `company_name` into
`additional_attributes['company_name']`.
- The example contact import CSV now uses the `company_name` header.
- Contact company sorting/filter config now uses `company_name`.
- Automation condition config now uses `company_name`.
- Existing standard automation conditions with `attribute_key:
'company'` are migrated to `company_name`.
- Existing saved contact filters with standard `attribute_key:
'company'` are migrated to `company_name`.
- Custom attributes named `company` are preserved and are not rewritten
by the migration.

## How to test

- Import a contact CSV with a `company_name` column and confirm the
Contact Company field is populated.
- Sort contacts by Company and confirm imported contacts are ordered
correctly.
- Create/edit an automation with Company as a condition and confirm it
saves with `company_name`.
- Verify existing saved contact filters and automation rules using the
old standard `company` key are migrated to `company_name`.

---------

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Sojan Jose <sojan@pepalo.com>

app/javascript/dashboard/components-next/filter/contactProvider.js

@@ -135,6 +135,16 @@ export function useContactFilterContext() {
       filterOperators: containmentOperators.value,
       attributeModel: 'standard',
     },
+    {
+      attributeKey: CONTACT_ATTRIBUTES.COMPANY_NAME,
+      value: CONTACT_ATTRIBUTES.COMPANY_NAME,
+      attributeName: t('CONTACTS_LAYOUT.FILTER.COMPANY'),
+      label: t('CONTACTS_LAYOUT.FILTER.COMPANY'),
+      inputType: 'plainText',
+      dataType: 'text',
+      filterOperators: containmentOperators.value,
+      attributeModel: 'standard',
+    },
     {
       attributeKey: CONTACT_ATTRIBUTES.CREATED_AT,
       value: CONTACT_ATTRIBUTES.CREATED_AT,

app/javascript/dashboard/components-next/filter/helper/filterHelper.js

@@ -23,6 +23,7 @@ export const CONTACT_ATTRIBUTES = {
   IDENTIFIER: 'identifier',
   COUNTRY_CODE: 'country_code',
   CITY: 'city',
+  COMPANY_NAME: 'company_name',
   CREATED_AT: 'created_at',
   LAST_ACTIVITY_AT: 'last_activity_at',
   REFERER: 'referer',