Improve analytics readability

[clyons]

Purpose / Big Picture

The Analytics view should stay readable as a portfolio grows. This change makes the existing charts easier to scan without changing what data they show: the commit heatmap fits the available panel width, the lifecycle chart keeps project names visible while scrolling through long timelines, and the portfolio health legend explains the recent-commit counts more clearly.

This is intentionally a frontend-only usability pass. It does not change how commit analytics are sourced from local repos, remote refs, or GitHub, so existing analytics semantics stay the same.

Summary

• make the commit heatmap resize to the available analytics panel width
• keep project labels visible while scrolling the lifecycle timeline and add a compact timeline range control
• simplify the portfolio health legend to Commits: 7d / 30d

Notes

• Frontend-only change.
• Does not change how commit analytics are sourced from local repos, remote refs, or GitHub.
• No database, API, or environment changes.

Validation

• npm ci in frontend/
• make fe-build

Build completed successfully. Vite emitted the existing large chunk warning.