Update LLM/API key error logs

[barun-saha]

Closes #188.

Summary by CodeRabbit

• Bug Fixes
  • Simplified authentication error message for LLM access (now a concise unified message without exception details) and updated embedded link text/formatting.
  • Suppressed internal error logging in streaming LLM handling while preserving existing error behavior.

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[coderabbitai]

📝 Walkthrough

Walkthrough

Updated LLM authentication error messaging in app.py to a concise, unified string (removing exception details) and removed runtime error logging from an exception handler in src/slidedeckai/helpers/llm_helper.py while still re-raising the exception.

Changes

Cohort / File(s)	Summary
Auth error message app.py	Replaced previous multi-part/verbose authentication error text with a single unified, more concise string that no longer embeds exception details; link text/formatting updated.
Exception logging removed src/slidedeckai/helpers/llm_helper.py	Removed/logging call inside the except block of stream_litellm_completion; the exception is still re-raised unchanged.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Update Streamlit, error handling, and prepare for a new release #187 — Overlapping changes to litellm error handling and logging in app.py and llm_helper.py.

Poem

🐰 I nibbled bytes and stitched a line,

Shorter words to make things fine.
No noisy logs to hop about,
Just tidy errors—soft and stout.
🥕✨

Pre-merge checks and finishing touches

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main change: updating error messages related to LLM/API key authentication, which aligns with the core objective of issue #188.
Linked Issues check	✅ Passed	The PR directly addresses issue #188's requirement to provide clearer error messages for missing or incorrect API keys by replacing raw exception text with more informative, user-friendly messages.
Out of Scope Changes check	✅ Passed	All changes are scoped to LLM/API key error handling in app.py and llm_helper.py, directly supporting the objective of improving error messages for authentication issues.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

✨ Finishing touches

• 📝 Generate docstrings

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📜 Recent review details

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between d3e3b00 and c7f2afc.

📒 Files selected for processing (2)

• app.py
• src/slidedeckai/helpers/llm_helper.py

💤 Files with no reviewable changes (1)

• src/slidedeckai/helpers/llm_helper.py

🚧 Files skipped from review as they are similar to previous changes (1)

• app.py

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (3)

• GitHub Check: test (3.12)
• GitHub Check: test (3.11)
• GitHub Check: test (3.10)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[coderabbitai]

Actionable comments posted: 2

📜 Review details

Configuration used: defaults

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 72225b3 and d3e3b00.

📒 Files selected for processing (2)

• app.py
• src/slidedeckai/helpers/llm_helper.py

🧰 Additional context used

📓 Path-based instructions (1)

**/*.py

📄 CodeRabbit inference engine (.github/copilot-instructions.md)

**/*.py: Use single quotes for strings in Python code unless double quotes are necessary; use triple double quotes for docstrings
Include type hints for parameters and return types when defining functions
Use f-strings for string formatting instead of % or .format() (except for logs)
Use Google-style docstrings for all functions and classes
Use two blank lines before top-level function and class definitions; use one blank line between methods inside a class
Enforce maximum line length of 100 characters; use brackets to break long lines and wrap long strings or expressions inside parentheses
Split long lines at braces with each parameter on a new line, indented inside parentheses

Files:

• src/slidedeckai/helpers/llm_helper.py
• app.py

⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (3)

• GitHub Check: test (3.11)
• GitHub Check: test (3.10)
• GitHub Check: test (3.12)