[WIP] Fix Claude token counter to use claude-sonnet-4-5

[Copilot]

• Update claude-token-counter.html to use claude-sonnet-4-5 model
• Verify the change by examining the updated file
• Test the HTML file manually - confirmed model constant is correctly set
• Complete the task

Changes Made:

• Updated the MODEL constant in claude-token-counter.html from claude-3-5-sonnet-20241022 to claude-sonnet-4-5

Verification:

• Manually tested the HTML file in a browser
• Verified the MODEL constant is correctly set to claude-sonnet-4-5
• Page loads and renders correctly with no JavaScript errors

Original prompt

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This section details on the original issue you should resolve

<issue_title>Fix Claude token counter</issue_title>
<issue_description>claude-token-counter.html needs to switch to using claude-sonnet-4-5.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Fix Claude token counter #97

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