Show cumulative AIC usage on overview

[asizikov]

Summary

Replace the Overview daily requests vs AI Credits chart with a cumulative AIC gross cost chart that shows when included credits are consumed and when additional spend begins.

Commit	Change
refactor: add static chart legend items	Adds reusable non-interactive static legend items to the shared line chart and uses them for the existing cost-management simulated additional usage legend.
feat: show cumulative AIC usage on overview	Adds a cumulative AIC gross cost chart, included-credit threshold, additional-spend legend, and scope-aware included-credit copy for organization and individual reports.

Validation

• npm run lint
• npm test -- --run
• npm run build

[Copilot]

Pull request overview

This PR updates the Overview dashboard to focus on usage-based billing by replacing the daily PRU vs AIC quantity chart with a cumulative AIC gross cost chart that visualizes included-credit consumption and when additional spend begins, plus scope-aware included-credit explanatory copy.

Changes:

• Adds a cumulative AIC gross cost chart with an included-credits threshold line and segment coloring to indicate when usage exceeds the included value.
• Introduces an includedAicCredits prop to drive included-credit threshold/value display on the Overview.
• Updates the included-credits informational callout to be scope-aware (individual vs organization).

Show a summary per file

File	Description
src/views/OverviewView.tsx	Replaces the old daily requests vs AIC chart with a cumulative AIC gross cost visualization and adds included-credits threshold + scope-aware explanatory copy.
src/App.tsx	Passes calculated included AIC credits into OverviewView via a new prop.

Copilot's findings

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• Files reviewed: 2/2 changed files
• Comments generated: 2