translator: add nil checks for tool call ids before dereferencing the pointers

[nacx]

Description

Adds nil checks for tool call IDs before dereferencing the pointers.

Related Issues/PRs (if applicable)

N/A

Special notes for reviewers (if applicable)

N/A

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.69%. Comparing base (21d65d6) to head (c59e431).

Files with missing lines	Patch %	Lines
internal/translator/anthropic_helper.go	0.00%	2 Missing and 1 partial ⚠️
internal/translator/gemini_helper.go	0.00%	1 Missing and 1 partial ⚠️
internal/translator/openai_awsbedrock.go	0.00%	1 Missing and 1 partial ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2242      +/-   ##
==========================================
- Coverage   84.71%   84.69%   -0.02%     
==========================================
  Files         144      144              
  Lines       21217    21224       +7     
==========================================
+ Hits        17973    17975       +2     
- Misses       2162     2165       +3     
- Partials     1082     1084       +2     

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[nacx]

/retest

[missBerg]

/retest

[nacx]

/retest