fix(core): prevent infinite loops with hard cap on consecutive same-name tool calls

[noxymon]

Summary

This PR implements a hard cap for consecutive calls to the same tool name to prevent infinite loops, especially in "thinking" tools where arguments (like thought numbers) change each time. It also enhances the loop detection event to carry more details to the UI.

Details

• Added CONSECUTIVE_SAME_TOOL_NAME_THRESHOLD (50) and THINKING_TOOL_LOOP_THRESHOLD (15) to LoopDetectionService.
• Enhanced loop detection to track consecutive calls to the same tool name even if arguments differ.
• Updated LoopDetected event to carry specific loop details ( ype, count, detail).
• Improved UI alerting in useGeminiStream to display detailed information about the detected loop.
• Added comprehensive unit tests for the new loop detection logic.

Related Issues

Fixes google-gemini#25671

How to Validate

1. Run
   pm test -w @google/gemini-cli-core -- loopDetectionService.test.ts to verify the logic.
2. Trigger a loop in the CLI with a tool that changes arguments (e.g. sequentialthinking) and verify it stops after 15 calls with a detailed message.

Pre-Merge Checklist

• Updated relevant documentation and README (if needed)
• Added/updated tests (if needed)
• Noted breaking changes (if any)
• Validated on required platforms/methods:
  • MacOS
    • npm run
    • npx
    • Docker
    • Podman
    • Seatbelt
  • Windows
    • npm run
    • npx
    • Docker
  • Linux
    • npm run
    • npx
    • Docker