feat: site languages, setup and site URL settings

features/localization_visual_checker.feature

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+Feature: The visual checker covers the Localization board
+  web/visual discovers the Localization board, its groups, its 1024 px
+  captures and its fixtures, so that this slice and every later localization
+  slice is gated against docs/design.
+
+  Background:
+    Given the board is docs/design/source/RenewCMS Screens Localization.dc.html with frame LocaleFrame
+    And the state tables are docs/design/screens/localization-*.md and docs/design/states.md
+    And task visual:check is a hard gate: every capture within 10 %, no unmocked /v1 call, no size mismatch, no exception without the user's approval
+    And no threshold is changed
+    And nothing in docs/design is edited
+
+  Scenario: Groups are discovered from the screen file
+    When task visual:check runs for "localization-site-languages"
+    Then the checker reads the visual reference line and the three groups L1, L1b and L2
+    And it lists their 25, 9 and 7 states by their loc.* ids
+    And a state with no setup in web/visual fails the run
+
+  Scenario Outline: Capture sizes
+    Given a state lists <sizes> in its Sizes column
+    Then the checker captures the board frame and the SPA at <widths>, in light and dark
+    And a state with 1440 and 390 only gets no 1024 capture
+
+    Examples:
+      | sizes           | widths                       |
+      | 1440, 390       | 1440x900 and 390x844         |
+      | 1440, 1024, 390 | 1440x900, 1024x? and 390x844 |
+
+  Scenario: Selecting frames
+    Given LocaleFrame is selected by LocaleFrame{s:{v:"sl",x:"multi"}}
+    Then the checker renders that state in the board and captures its frame
+    And a state is addressed by its loc.* id, not by the legacy name
+
+  Scenario: Fixtures and mocks
+    Then every state's setup uses the matching fixture of locale-fixtures.js (Journal, Atelier, Archive, Notes, Gallery)
+    And the mocked /v1 responses are derived from those fixtures
+    And the board's it, ja and zh-Hans tags are used by mocks only
+    And states that depend on the current date or time are skipped as clock-sensitive and nothing else is
+
+  Scenario: Existing screens are unaffected
+    When task visual:check runs for any screen that existed before
+    Then its states, sizes and verdicts are the same as before