Add main link to each phase of the budget

Co-authored-by: decabeza <alberto@decabeza.es>

spec/components/budgets/phases_component_spec.rb

@@ -0,0 +1,17 @@
+require "rails_helper"
+
+describe Budgets::PhasesComponent, type: :component do
+  let(:budget) { create(:budget) }
+
+  it "shows budget current phase main link when defined" do
+    render_inline Budgets::PhasesComponent.new(budget)
+
+    expect(page).not_to have_css(".main-link")
+
+    budget.current_phase.update!(main_link_text: "Phase link!", main_link_url: "https://consulproject.org")
+    render_inline Budgets::PhasesComponent.new(budget)
+
+    expect(page).to have_css(".main-link")
+    expect(page).to have_link("Phase link!", href: "https://consulproject.org")
+  end
+end