Add usage forecast overlay

[kmatsunami]

Summary

• add a linear usage projection model and expose forecast text/overlay data on usage metrics
• render forecast markers in the menu card and provider detail bars, keeping overflow text above 100% while clamping drawing
• harden local dev scripts so ./Scripts/compile_and_run.sh and pnpm check work in the current CLT-based environment

Testing

• ./Scripts/compile_and_run.sh
• pnpm check

Related

• Closes Add quota exhaustion projection overlay to usage bars #1