Fix(demo): correct bug in k-mail-replier's Gemini implementation

[Rahul-Lashkari]

fixed bugs that prevented the Gemini model path in the k-mail-replier demo from running.

• fixed UnicodeDecodeError on Windows by adding encoding='utf-8 in app.py
• updated the model name from Available models list to fix a 404 not found api error

tested the app locally.

[gemini-code-assist]

Summary of Changes

Hello @Rahul-Lashkari, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses critical bugs within the k-mail-replier demo's Gemini implementation, ensuring its proper functionality. The changes specifically tackle a file encoding issue that affected Windows environments and an outdated model reference that led to API errors, making the demo robust and operational.

Highlights

• UnicodeDecodeError Fix: Resolved a UnicodeDecodeError on Windows by explicitly adding encoding='utf-8' when opening the email-001-ko.txt file in app.py.
• Gemini Model Update: Corrected a 404 API error by updating the Gemini model name from gemini-1.5-flash to gemini-2.5-flash in gemini.py.

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[gemini-code-assist]

Code Review

This pull request effectively addresses two bugs that were preventing the Gemini model path in the k-mail-replier demo from running. The fix for the UnicodeDecodeError by explicitly setting encoding='utf-8' is correct, and updating the model name from gemini-1.5-flash to gemini-2.5-flash resolves the 404 API error. The changes are well-targeted and improve the demo's functionality. I have one suggestion in gemini.py to improve code maintainability by using a constant for the model name.

[gemini-code-assist]

To improve maintainability and avoid using 'magic strings', it's a good practice to define the model name 'gemini-2.5-flash' as a constant at the module level (e.g., GEMINI_MODEL_NAME = 'gemini-2.5-flash'). This makes it easier to locate and update the model name in the future if it changes again.

[bebechien]

LGTM