feat(settings): add Cloud link to settings sidebar for cloud backends (#1453)

* feat(settings): add Cloud link to settings sidebar for cloud backends

Add a "Cloud" external link at the bottom of the Settings sidebar that
appears only when the active backend is a Cloud backend. It links to
`{cloudHost}/settings` (opens in a new tab) with an external-link icon,
giving users a quick path to their hosted account/settings page. Local
backends and the no-backend state render nothing.

- New `CloudSettingsLink` component reads the active backend and renders
  only for cloud backends, normalizing the host (trailing slash) before
  appending `/settings`.
- Added to the desktop sidebar, mobile hub, and mobile drawer (next to
  the existing backend-synced badge).
- New i18n key `SETTINGS$CLOUD_SETTINGS_LINK` (allowlisted as a brand
  name since "Cloud" is identical across locales).
- Added unit tests covering cloud/local/no-backend cases and URL building.

Screenshot of the new Cloud button in the Settings window: .pr/settings-cloud-button.png

Co-authored-by: openhands <openhands@all-hands.dev>

* docs(pr): replace screenshot with correct Settings sidebar view

The previous screenshot captured the manage-backends overlay that
appears for a logged-out cloud backend, not the Settings sidebar.
Re-captured against a connected cloud backend so the Cloud link is
visible at the bottom of the Settings sidebar alongside the nav items.

Co-authored-by: openhands <openhands@all-hands.dev>

* feat(settings): add cloud glyph to Cloud settings sidebar link

Render the Cloud settings link with a leading cloud icon (lucide `Cloud`)
next to the "Cloud" label, keeping the trailing external-link icon so
users can tell it opens the hosted page in a new tab. Matches the other
iconified rows in the Settings sidebar.

Update the PR screenshot to show the new two-icon layout.

* feat(settings): place Cloud link below Secrets with nav-row styling

Move the Cloud settings link out of the sidebar footer into the nav
list, directly below the Secrets entry and above the synced-settings
badge, so it sits where users expect a settings sub-page to be.

Restyle the link to match the other sidebar nav rows: reuse the shared
sidebar-layout classes (sidebarNavRowClassName + SIDEBAR_ROW_INTERACTIVE
idle, SIDEBAR_ICON_SLOT_CLASS, sidebarNavLabelClassName) so it has the
same height, padding, border-radius, transparent idle background, and
hover background as Secrets/LLM/etc. Drop the bespoke bordered card.
Still renders a leading cloud glyph, the "Cloud" label, and a trailing
external-link icon.

Apply the same placement in the mobile hub and mobile drawer.

* chore: Remove PR-only artifacts

* docs(settings): simplify CloudSettingsLink JSDoc; add PR screenshots

- Apply reviewer suggestion to trim verbose JSDoc (keep only the
  non-obvious note about why local backends are excluded).
- Add the three evidence screenshots referenced in the PR description
  to .pr/ so the Video/Screenshots links resolve on the branch.

---------

Co-authored-by: openhands <openhands@all-hands.dev>
Co-authored-by: neubig <398875+neubig@users.noreply.github.com>
Co-authored-by: allhands-bot <allhands-bot@users.noreply.github.com>

scripts/check-translation-completeness.cjs

@@ -34,6 +34,7 @@ const IDENTICAL_VALUE_ALLOWLIST = new Set([
   'SETTINGS$AGENT_SERVER_URL_PLACEHOLDER',
   'SETTINGS$AGENT_TYPE_OPENHANDS',
   'SETTINGS$AZURE_DEVOPS',
+  'SETTINGS$CLOUD_SETTINGS_LINK',
   'SETTINGS$GITHUB',
   'SETTINGS$GITLAB',
   'SETTINGS$MCP_DEFAULT_CONFIG',