fix: handle context window exceeded errors during context condensing

[roomote]

This PR attempts to address Issue #10781.

Problem

When the selected condensing model has a smaller context window than the current conversation, the API throws an error that was previously unhandled. This caused the UI to hang with "Condensing Chat" forever, giving no feedback to the user.

Solution

Added error handling around the streaming API call in summarizeConversation() to:

1. Catch API errors during the condensing process
2. Detect context window exceeded errors using common error message patterns
3. Return a user-friendly error message via the existing error display mechanism
4. Handle other API errors with a generic error message that includes the original error details

Changes

• src/core/condense/index.ts: Added try-catch around the streaming API call
• src/i18n/locales/en/common.json: Added new translation key condense_context_window_exceeded
• src/core/condense/__tests__/index.spec.ts: Added 3 test cases for error handling

Testing

• All 47 tests in the condense module pass
• Lint and type checks pass

Feedback and guidance are welcome!

---

Important

Adds error handling for context window exceeded errors in summarizeConversation() and updates translations and tests.

• Behavior:
  • Adds error handling in summarizeConversation() to catch context window exceeded errors and return user-friendly messages.
  • Handles other API errors with a generic error message including original error details.
• Files:
  • index.ts: Adds try-catch block around streaming API call in summarizeConversation().
  • index.spec.ts: Adds test cases for context window exceeded and generic API error handling.
  • common.json: Adds translation key condense_context_window_exceeded in multiple locales.
• Testing:
  • All tests in the condense module pass.
  • Lint and type checks pass.

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[roomote]

Rooviewer   See task on Roo Cloud

Review complete. No issues found.

The implementation correctly handles context window exceeded errors during context condensing by:

• Wrapping the streaming API call in try-catch
• Detecting context window errors using reasonable pattern matching
• Returning user-friendly error messages via the existing error display mechanism
• Preserving original messages on error
• Including appropriate test coverage
• Adding translations for the error message to all 17 non-English locales

Previous reviews

• 3c3ef35: Review #1

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[DarkEden-coding]

This looks good to fix #10781

[DarkEden-coding]

@roomote you are missing translations of the error message, see failed check-translations check:

BACKEND - Checking 17 non-English locale(s): ca, de, es, fr, hi, id, it, ja, ko, nl, pl, pt-BR, ru, tr, vi, zh-CN, zh-TW
Checking 5 translation file(s): common.json, embeddings.json, marketplace.json, mcp.json, tools.json

BACKEND Missing Translations Report:

📝 ca:
  - common.json: 1 missing translations
      errors.condense_context_window_exceeded: "The selected condensing model's context window is too small for the current conversation. Please select a model with a larger context window or manually reduce the conversation size first."

📝 de:
  - common.json: 1 missing translations
      errors.condense_context_window_exceeded: "The selected condensing model's context window is too small for the current conversation. Please select a model with a larger context window or manually reduce the conversation size first."

📝 es:
  - common.json: 1 missing translations
      errors.condense_context_window_exceeded: "The selected condensing model's context window is too small for the current conversation. Please select a model with a larger context window or manually reduce the conversation size first."

📝 fr:
  - common.json: 1 missing translations
      errors.condense_context_window_exceeded: "The selected condensing model's context window is too small for the current conversation. Please select a model with a larger context window or manually reduce the conversation size first."

📝 hi:
  - common.json: 1 missing translations
      errors.condense_context_window_exceeded: "The selected condensing model's context window is too small for the current conversation. Please select a model with a larger context window or manually reduce the conversation size first."

📝 id:
  - common.json: 1 missing translations
      errors.condense_context_window_exceeded: "The selected condensing model's context window is too small for the current conversation. Please select a model with a larger context window or manually reduce the conversation size first."

📝 it:
  - common.json: 1 missing translations
      errors.condense_context_window_exceeded: "The selected condensing model's context window is too small for the current conversation. Please select a model with a larger context window or manually reduce the conversation size first."

📝 ja:
  - common.json: 1 missing translations
      errors.condense_context_window_exceeded: "The selected condensing model's context window is too small for the current conversation. Please select a model with a larger context window or manually reduce the conversation size first."

📝 ko:
  - common.json: 1 missing translations
      errors.condense_context_window_exceeded: "The selected condensing model's context window is too small for the current conversation. Please select a model with a larger context window or manually reduce the conversation size first."

📝 nl:
  - common.json: 1 missing translations
      errors.condense_context_window_exceeded: "The selected condensing model's context window is too small for the current conversation. Please select a model with a larger context window or manually reduce the conversation size first."

📝 pl:
  - common.json: 1 missing translations
      errors.condense_context_window_exceeded: "The selected condensing model's context window is too small for the current conversation. Please select a model with a larger context window or manually reduce the conversation size first."

📝 pt-BR:
  - common.json: 1 missing translations
      errors.condense_context_window_exceeded: "The selected condensing model's context window is too small for the current conversation. Please select a model with a larger context window or manually reduce the conversation size first."

📝 ru:
  - common.json: 1 missing translations
      errors.condense_context_window_exceeded: "The selected condensing model's context window is too small for the current conversation. Please select a model with a larger context window or manually reduce the conversation size first."

📝 tr:
  - common.json: 1 missing translations
      errors.condense_context_window_exceeded: "The selected condensing model's context window is too small for the current conversation. Please select a model with a larger context window or manually reduce the conversation size first."

📝 vi:
  - common.json: 1 missing translations
      errors.condense_context_window_exceeded: "The selected condensing model's context window is too small for the current conversation. Please select a model with a larger context window or manually reduce the conversation size first."

📝 zh-CN:
  - common.json: 1 missing translations
      errors.condense_context_window_exceeded: "The selected condensing model's context window is too small for the current conversation. Please select a model with a larger context window or manually reduce the conversation size first."

📝 zh-TW:
  - common.json: 1 missing translations
      errors.condense_context_window_exceeded: "The selected condensing model's context window is too small for the current conversation. Please select a model with a larger context window or manually reduce the conversation size first."

[roomote]

Fixaroo   See task on Roo Cloud

Fixed the missing translations. Added errors.condense_context_window_exceeded to all 17 non-English locale files. Translation check passes.

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