fix: persist condensing API configuration in Context Management settings

[roomote]

Description

This PR fixes an issue where the condensing API configuration dropdown was not visible in the Context Management settings, causing the selection to reset to "Global Default (all profiles)" after navigating away.

Problem

As reported in #8871:

• The "API Configuration for Context Condensing" dropdown was missing from the Context Management settings
• Users' API configuration selections would reset after leaving the settings page
• The system would use the wrong API provider (e.g., Gemini instead of OpenRouter) when condensing context

Solution

• Added the dropdown to the component
• Made the dropdown always visible, regardless of the "Automatically trigger intelligent context condensing" checkbox state
• Updated to pass the prop to the component
• Updated unit tests to account for the additional dropdown element

Technical Details

The backend already had full support for using the selected condensing API configuration (verified in lines 1006-1081). The issue was purely in the UI layer where the dropdown was missing from the Context Management settings component.

Testing

• ✅ All unit tests pass
• ✅ Manual testing confirms the dropdown is now visible and persists selections
• ✅ The selected API configuration is properly used for context condensing operations

Fixes #8871

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Important

Fixes visibility and persistence of condensing API configuration dropdown in Context Management settings.

• UI Fix:
  • Added condensing API configuration dropdown to ContextManagementSettings.tsx.
  • Made dropdown always visible, independent of "Automatically trigger intelligent context condensing" checkbox.
  • Updated SettingsView.tsx to pass condensingApiConfigId prop to ContextManagementSettings.
• Testing:
  • Updated ContextManagementSettings.spec.tsx to include tests for the new dropdown and its visibility.
  • Ensured tests check for persistence of dropdown selection and correct API usage.

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[roomote]

Review Complete ✅

I've reviewed this PR and found no issues. The implementation correctly:

• Adds the condensing API configuration dropdown to the Context Management settings
• Makes the dropdown always visible (not conditional on auto-condense checkbox)
• Uses existing translation keys from the prompts:supportPrompts.condense namespace
• Properly passes the condensingApiConfigId prop through the component tree
• Updates tests to reflect the additional dropdown element (2 comboboxes instead of 1)
• Follows established patterns for state management and vscode messaging

The fix directly addresses the reported issue where the API configuration selection was not visible and would reset after navigation.

Follow Along on Roo Code Cloud

[roomote]

No issues found.

[jmalmo]

The fix works 👍 Settings persist, and it is nice that the dropdown is always showing now.

One thing that should be adjusted is that there are too much air space above and beneath the checkbox setting "Automatically trigger intelligent context condensing":