Refine gateway setup wizard UX and fix accessibility gaps (#940)

Refine the gateway setup wizard UX, improve accessibility names, make wizard text selectable, and fix the expanded-provider step id handling.

Follow-up included in this merge: remove the stale 'More' overflow button when resetting wizard steps so it cannot leak onto later steps.

Validation: local build.ps1, Shared tests, Tray tests; GitHub Build and Test, CodeQL gate, Socket checks all passed.

Author: karkarl

docs/setup-wizard-ux/01-welcome-security.png

@@ -0,0 +1,47 @@
+# Setup wizard UX refresh — screens & accessibility proof
+
+Screenshots captured from the live isolated dev app (`OPENCLAW_FORCE_ONBOARDING=1`,
+`run-app-local.ps1 -NoBuild -Isolated`) walking the full gateway setup + onboard flow.
+Accessibility was scanned per-screen with a standalone Axe.Windows (v2.4.1) scanner
+against the live process — the same engine Accessibility Insights uses.
+
+## Screens
+
+| # | Screen | Notes |
+|---|--------|-------|
+| 01 | Welcome + security notice | Selectable RichTextBlock body |
+| 02 | Setup mode | Single-selection `ListView` (ItemContainer), first item selected by default |
+| 03 | Config handling | Single-selection list, standardized bottom bar |
+| 04 | Model/auth provider (collapsed) | "Skip for now" pinned to top, subtle **More ▾** expander |
+| 05 | Model/auth provider (expanded) | One-click expand keeps "Skip for now"; full provider list |
+| 06 | Auth method | Single-selection list |
+| 07 | Text input step | API-key entry |
+| 08 | Capabilities | Radio group with accessible names (a11y fix) |
+
+Bottom action bar across steps: standard **Back** button, `AccentButtonStyle`
+primary (Continue), subtle **More options** / **Skip** / **Start over** controls.
+
+## Accessibility results (Axe.Windows, actionable violations)
+
+All refactored surfaces flagged `NameNotNull` (focusable element with a null
+accessible Name) before the fix; every one is 0 after.
+
+| Screen | Before | After |
+|--------|:------:|:-----:|
+| Capabilities radio group | 3 | 0 |
+| Setup mode ListView | 2 | 0 |
+| Provider list (collapsed) | 6 | 0 |
+| Provider list (expanded) | 7 | 0 |
+| Welcome / Confirm / Auth / Text input | 0 | 0 |
+
+### Fixes
+- `WizardPage` option lists: each `ListViewItem` (and multiselect `CheckBox`) now
+  gets `AutomationProperties.Name` = label + hint via a shared `CreateOptionItem`
+  helper.
+- `CapabilitiesPage`: the three profile radio buttons (Read-only / Standard /
+  Full access) now set `AutomationProperties.Name`.
+
+### Known framework limitation (not fixed)
+Inline `Hyperlink` elements inside a `RichTextBlock` (security disclaimer link)
+report a null `BoundingRectangle` to UIA when scrolled out of view. This is a
+WinUI framework behavior for inline hyperlinks, not a control we construct.

docs/setup-wizard-ux/02-setup-mode-listview.png

@@ -86,10 +86,10 @@
                 <Border Width="8" Height="8" CornerRadius="4" VerticalAlignment="Center" Background="{ThemeResource SetupInactiveDotBrush}" />
             </StackPanel>
             <Button x:Name="BackButton" Grid.Column="0" Content="Back"
-                    Height="44" MinWidth="96" HorizontalAlignment="Left"
+                    MinWidth="100" HorizontalAlignment="Left"
                     Click="Back_Click" />
             <Button x:Name="OpenConnectionButton" Grid.Column="1" Content="Open Companion Settings"
-                    Height="44" MinWidth="200" HorizontalAlignment="Right"
+                    MinWidth="100" HorizontalAlignment="Right"
                     Style="{StaticResource AccentButtonStyle}"
                     Click="OpenConnection_Click" />
         </Grid>