feat(vendor): add frontend for contact info inheritance

Add UI for vendor contact field inheritance from company:
- Show "(from company)" indicator for inherited fields
- Add "Reset" button per field to clear override
- Add "Reset All to Company" button for bulk reset
- Purple border styling for inherited fields
- Dynamic placeholder showing company values

JavaScript methods:
- resetFieldToCompany(fieldName): Reset individual field
- resetAllContactToCompany(): Reset all contact fields
- hasAnyContactOverride(): Check if any field is overridden

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

app/templates/admin/vendor-edit.html

@@ -164,9 +164,20 @@
 
             <!-- Right Column: Contact Info -->
             <div>
-                <h3 class="mb-4 text-lg font-semibold text-gray-700 dark:text-gray-200">
+                <div class="flex items-center justify-between mb-4">
-                    Contact Information
+                    <h3 class="text-lg font-semibold text-gray-700 dark:text-gray-200">
-                </h3>
+                        Contact Information
+                    </h3>
+                    <button
+                        type="button"
+                        @click="resetAllContactToCompany()"
+                        :disabled="saving || !hasAnyContactOverride()"
+                        class="text-xs px-2 py-1 text-purple-600 dark:text-purple-400 hover:text-purple-800 dark:hover:text-purple-300 disabled:opacity-50 disabled:cursor-not-allowed"
+                        title="Reset all contact fields to inherit from company">
+                        <span x-html="$icon('refresh', 'w-3 h-3 inline mr-1')"></span>
+                        Reset All to Company
+                    </button>
+                </div>
 
                 <!-- Owner Email (readonly) -->
                 <label class="block mb-4 text-sm">
@@ -186,47 +197,97 @@
 
                 <!-- Contact Email -->
                 <label class="block mb-4 text-sm">
-                    <span class="text-gray-700 dark:text-gray-400">
+                    <div class="flex items-center justify-between">
-                        Contact Email <span class="text-red-600">*</span>
+                        <span class="text-gray-700 dark:text-gray-400">
-                    </span>
+                            Contact Email
+                            <span x-show="vendor?.contact_email_inherited"
+                                  class="ml-1 text-xs text-purple-500 dark:text-purple-400"
+                                  title="Inherited from company">
+                                (from company)
+                            </span>
+                        </span>
+                        <button
+                            type="button"
+                            x-show="!vendor?.contact_email_inherited && formData.contact_email"
+                            @click="resetFieldToCompany('contact_email')"
+                            :disabled="saving"
+                            class="text-xs text-purple-600 hover:text-purple-800 dark:text-purple-400">
+                            Reset
+                        </button>
+                    </div>
                     <input
                         type="email"
                         x-model="formData.contact_email"
-                        required
+                        :placeholder="vendor?.company_contact_email || 'contact@company.com'"
                         :disabled="saving"
                         class="block w-full mt-1 text-sm dark:text-gray-300 dark:border-gray-600 dark:bg-gray-700 focus:border-purple-400 focus:outline-none focus:shadow-outline-purple dark:focus:shadow-outline-gray form-input"
-                        :class="{ 'border-red-600 focus:border-red-400 focus:shadow-outline-red': errors.contact_email }"
+                        :class="{
+                            'border-red-600 focus:border-red-400 focus:shadow-outline-red': errors.contact_email,
+                            'border-purple-300 dark:border-purple-600': vendor?.contact_email_inherited
+                        }"
                     >
                     <span class="text-xs text-gray-600 dark:text-gray-400 mt-1">
-                        Public business contact email
+                        <span x-show="vendor?.contact_email_inherited">Using company value. Enter a value to override.</span>
+                        <span x-show="!vendor?.contact_email_inherited">Custom value (clear to inherit from company)</span>
                     </span>
                     <span x-show="errors.contact_email" class="text-xs text-red-600 dark:text-red-400 mt-1" x-text="errors.contact_email"></span>
                 </label>
 
                 <!-- Phone -->
                 <label class="block mb-4 text-sm">
-                    <span class="text-gray-700 dark:text-gray-400">
+                    <div class="flex items-center justify-between">
-                        Phone
+                        <span class="text-gray-700 dark:text-gray-400">
-                    </span>
+                            Phone
+                            <span x-show="vendor?.contact_phone_inherited"
+                                  class="ml-1 text-xs text-purple-500 dark:text-purple-400">
+                                (from company)
+                            </span>
+                        </span>
+                        <button
+                            type="button"
+                            x-show="!vendor?.contact_phone_inherited && formData.contact_phone"
+                            @click="resetFieldToCompany('contact_phone')"
+                            :disabled="saving"
+                            class="text-xs text-purple-600 hover:text-purple-800 dark:text-purple-400">
+                            Reset
+                        </button>
+                    </div>
                     <input
                         type="tel"
                         x-model="formData.contact_phone"
+                        :placeholder="vendor?.company_contact_phone || '+352 XXX XXX'"
                         :disabled="saving"
                         class="block w-full mt-1 text-sm dark:text-gray-300 dark:border-gray-600 dark:bg-gray-700 focus:border-purple-400 focus:outline-none focus:shadow-outline-purple dark:focus:shadow-outline-gray form-input"
+                        :class="{ 'border-purple-300 dark:border-purple-600': vendor?.contact_phone_inherited }"
                     >
                 </label>
 
                 <!-- Website -->
                 <label class="block mb-4 text-sm">
-                    <span class="text-gray-700 dark:text-gray-400">
+                    <div class="flex items-center justify-between">
-                        Website
+                        <span class="text-gray-700 dark:text-gray-400">
-                    </span>
+                            Website
+                            <span x-show="vendor?.website_inherited"
+                                  class="ml-1 text-xs text-purple-500 dark:text-purple-400">
+                                (from company)
+                            </span>
+                        </span>
+                        <button
+                            type="button"
+                            x-show="!vendor?.website_inherited && formData.website"
+                            @click="resetFieldToCompany('website')"
+                            :disabled="saving"
+                            class="text-xs text-purple-600 hover:text-purple-800 dark:text-purple-400">
+                            Reset
+                        </button>
+                    </div>
                     <input
                         type="url"
                         x-model="formData.website"
+                        :placeholder="vendor?.company_website || 'https://company.com'"
                         :disabled="saving"
-                        placeholder="https://example.com"
                         class="block w-full mt-1 text-sm dark:text-gray-300 dark:border-gray-600 dark:bg-gray-700 focus:border-purple-400 focus:outline-none focus:shadow-outline-purple dark:focus:shadow-outline-gray form-input"
+                        :class="{ 'border-purple-300 dark:border-purple-600': vendor?.website_inherited }"
                     >
                 </label>
             </div>
@@ -241,27 +302,59 @@
             <div class="grid gap-6 md:grid-cols-2">
                 <!-- Business Address -->
                 <label class="block text-sm">
-                    <span class="text-gray-700 dark:text-gray-400">
+                    <div class="flex items-center justify-between">
-                        Business Address
+                        <span class="text-gray-700 dark:text-gray-400">
-                    </span>
+                            Business Address
+                            <span x-show="vendor?.business_address_inherited"
+                                  class="ml-1 text-xs text-purple-500 dark:text-purple-400">
+                                (from company)
+                            </span>
+                        </span>
+                        <button
+                            type="button"
+                            x-show="!vendor?.business_address_inherited && formData.business_address"
+                            @click="resetFieldToCompany('business_address')"
+                            :disabled="saving"
+                            class="text-xs text-purple-600 hover:text-purple-800 dark:text-purple-400">
+                            Reset
+                        </button>
+                    </div>
                     <textarea
                         x-model="formData.business_address"
                         rows="3"
                         :disabled="saving"
+                        :placeholder="vendor?.business_address_inherited ? 'Using company address' : 'Enter business address'"
                         class="block w-full mt-1 text-sm dark:text-gray-300 dark:border-gray-600 dark:bg-gray-700 focus:border-purple-400 focus:outline-none focus:shadow-outline-purple dark:focus:shadow-outline-gray form-textarea"
+                        :class="{ 'border-purple-300 dark:border-purple-600': vendor?.business_address_inherited }"
                     ></textarea>
                 </label>
 
                 <!-- Tax Number -->
                 <label class="block text-sm">
-                    <span class="text-gray-700 dark:text-gray-400">
+                    <div class="flex items-center justify-between">
-                        Tax Number
+                        <span class="text-gray-700 dark:text-gray-400">
-                    </span>
+                            Tax Number
+                            <span x-show="vendor?.tax_number_inherited"
+                                  class="ml-1 text-xs text-purple-500 dark:text-purple-400">
+                                (from company)
+                            </span>
+                        </span>
+                        <button
+                            type="button"
+                            x-show="!vendor?.tax_number_inherited && formData.tax_number"
+                            @click="resetFieldToCompany('tax_number')"
+                            :disabled="saving"
+                            class="text-xs text-purple-600 hover:text-purple-800 dark:text-purple-400">
+                            Reset
+                        </button>
+                    </div>
                     <input
                         type="text"
                         x-model="formData.tax_number"
                         :disabled="saving"
+                        :placeholder="vendor?.tax_number_inherited ? 'Using company tax number' : 'Enter tax number'"
                         class="block w-full mt-1 text-sm dark:text-gray-300 dark:border-gray-600 dark:bg-gray-700 focus:border-purple-400 focus:outline-none focus:shadow-outline-purple dark:focus:shadow-outline-gray form-input"
+                        :class="{ 'border-purple-300 dark:border-purple-600': vendor?.tax_number_inherited }"
                     >
                 </label>
             </div>

static/admin/js/vendor-edit.js

@@ -254,6 +254,57 @@ function adminVendorEdit() {
             } finally {
                 this.saving = false;
             }
+        },
+
+        // ===== Contact Field Inheritance Methods =====
+
+        /**
+         * Reset a single contact field to inherit from company.
+         * Sets the field to empty string, which the backend converts to null (inherit).
+         * @param {string} fieldName - The contact field to reset
+         */
+        resetFieldToCompany(fieldName) {
+            const contactFields = ['contact_email', 'contact_phone', 'website', 'business_address', 'tax_number'];
+            if (!contactFields.includes(fieldName)) {
+                editLog.warn('Invalid contact field:', fieldName);
+                return;
+            }
+
+            editLog.info(`Resetting ${fieldName} to inherit from company`);
+            this.formData[fieldName] = '';
+
+            // Update the vendor object to reflect inheritance (UI indicator)
+            if (this.vendor) {
+                this.vendor[`${fieldName}_inherited`] = true;
+            }
+        },
+
+        /**
+         * Reset all contact fields to inherit from company.
+         */
+        resetAllContactToCompany() {
+            editLog.info('Resetting all contact fields to inherit from company');
+
+            const contactFields = ['contact_email', 'contact_phone', 'website', 'business_address', 'tax_number'];
+            contactFields.forEach(field => {
+                this.formData[field] = '';
+                if (this.vendor) {
+                    this.vendor[`${field}_inherited`] = true;
+                }
+            });
+
+            Utils.showToast('All contact fields reset to company defaults', 'info');
+        },
+
+        /**
+         * Check if any contact field has a vendor-level override (not inherited).
+         * @returns {boolean} True if at least one contact field is overridden
+         */
+        hasAnyContactOverride() {
+            if (!this.vendor) return false;
+
+            const contactFields = ['contact_email', 'contact_phone', 'website', 'business_address', 'tax_number'];
+            return contactFields.some(field => !this.vendor[`${field}_inherited`]);
         }
     };
 }