CLDC-4333: staircasing value hint text/validation fix (#3270)

* CLDC-4333: update purchase price soft vals to take stairbought into account

* CLDC-4333: set hard min to 0 for staircasing

* CLDC-4333: add dynamic hard min based on stairbought

* CLDC-4333: step value input width up to next option

* CLDC-4333: update value spec

* CLDC-4333: update hint text instead to ensure value is 100% of equity

* CLDC-4333: update hint text instead to ensure value is 100% of equity

* CLDC-4333: revert q text change to align with spec

* CLDC-4333: revert spec changes

* CLDC-4333: revert 2025 changes

* CLDC-4333: clarify 2026 question

* CLDC-4333: revert question fix

* CLDC-4333: revert initial purchase hint text update

app/models/form/sales/questions/value.rb

@@ -6,7 +6,7 @@ class Form::Sales::Questions::Value < ::Form::Question
     @type = "numeric"
     @min = form.start_year_2026_or_later? ? 15_000 : 0
     @step = 1
-    @width = 5
+    @width = 10
     @prefix = "£"
     @question_number = get_question_number_from_hash(QUESTION_NUMBER_FROM_YEAR_AND_SECTION, value_key: subsection.id)
     @top_guidance_partial = "financial_calculations_shared_ownership"

config/locales/forms/2026/sales/sale_information.en.yml

@@ -153,7 +153,7 @@ en:
             value_shared_ownership_staircase:
               check_answer_label: "Full purchase price"
               check_answer_prompt: ""
-              hint_text: "Enter the full purchase price paid for the equity bought in this staircasing transaction (this is equal to the value of the share bought by the purchaser)."
+              hint_text: "Enter the full purchase price of the property before any discounts are applied. For shared ownership, enter the full purchase price paid for 100% equity (this is equal to the value of the share owned by the PRP plus the value bought by the purchaser in the current and all previous transactions)."
               question_text: "What was the full purchase price for this staircasing transaction?"
 
           equity:

config/locales/validations/sales/sale_information.en.yml

@@ -76,7 +76,7 @@ en:
             mortgage_not_used: "The cash deposit is %{deposit}.</br></br>The full purchase price (%{value}) multiplied by the percentage bought is %{expected_shared_ownership_deposit_value}.</br></br>These two amounts should be the same."
             mortgage_used_socialhomebuy: "The mortgage amount (%{mortgage}), cash deposit (%{deposit}), and cash discount (%{cashdis}) added together is %{mortgage_deposit_and_discount_total}.</br></br>The full purchase price (%{value}) multiplied by the percentage equity stake purchased (%{equity}) is %{expected_shared_ownership_deposit_value}.</br></br>These two amounts should be the same."
             mortgage_not_used_socialhomebuy: "The cash deposit (%{deposit}) and cash discount (%{cashdis}) added together is %{deposit_and_discount_total}.</br></br>The full purchase price (%{value}) multiplied by the percentage bought (%{equity}) is %{expected_shared_ownership_deposit_value}.</br></br>These two amounts should be the same."
-          staircasing_mortgage: # this key
+          staircasing_mortgage:
             mortgage_used: "The mortgage (%{mortgage}) and cash deposit (%{deposit}) added together is %{mortgage_and_deposit_total}.</br></br>The full purchase price (%{value}) multiplied by the percentage bought is %{stairbought_part_of_value}.</br></br>These two amounts should be the same."
             mortgage_not_used: "The cash deposit is %{deposit}.</br></br>The full purchase price (%{value}) multiplied by the percentage bought is %{stairbought_part_of_value}.</br></br>These two amounts should be the same."
             mortgage_used_socialhomebuy: "The mortgage amount (%{mortgage}), cash deposit (%{deposit}), and cash discount (%{cashdis}) added together is %{mortgage_deposit_and_discount_total}.</br></br>The full purchase price (%{value}) multiplied by the percentage bought (%{stairbought}) is %{stairbought_part_of_value}.</br></br>These two amounts should be the same."

spec/models/form/sales/questions/value_spec.rb

@@ -32,7 +32,7 @@ RSpec.describe Form::Sales::Questions::Value, type: :model do
   end
 
   it "has correct width" do
-    expect(question.width).to eq(5)
+    expect(question.width).to eq(10)
   end
 
   it "has correct prefix" do