fix: make showSidebarBar and showFooterBar hide only usage bars

[mynameistito]

Summary

The provider display settings showSidebarBar and showFooterBar currently hide the entire provider view. They should only hide the usage percentage bar ([████░░░░░░░░]) while keeping the provider and its other usage information visible.

Expected behavior

• enabled: false for a provider hides that provider entirely and stops fetching it.
• showSidebarBar: false keeps the provider visible in the sidebar, including its name, tier, errors, reset information, and usage percentage, but removes only the sidebar usage bar.
• showFooterBar: false keeps the provider's footer information visible, including the percentage and reset text, but removes only the footer usage bar.
• The settings should remain independent per provider.

Current behavior

• showSidebarBar: false removes the provider from the sidebar entirely.
• showFooterBar: false removes the provider's footer usage display entirely.

This is confusing because the existing enabled setting already represents whether a provider should be fetched and displayed.

Scope

Please apply the fix to both release lanes:

• OpenCode @latest / main
• OpenCode @next / opencode-v2

Reproduction

Configure an enabled provider with either display flag set to false:

{
  "providers": {
    "codex": {
      "enabled": true,
      "showSidebarBar": false,
      "showFooterBar": false
    }
  }
}

The provider view disappears instead of only its [█░░░░░░░] usage bar.