Add a 📊 stats dialog with a 14-day runs chart

[Necromancervbh]

A new 📊 button in the header opens a stats dialog:

• Tiles: successful runs, success rate, manual work saved, best streak (and the current one), and how many different cards you've used
• Runs over the last 14 days: a bar chart.
  • Hover or point at a day for "Sun 27 Sep: 11 runs, 3m saved" (failures are included when there are any).
  • Only today's bar and the tallest bar carry a number, so the chart stays readable.
  • Show as a table lists the same numbers for screen readers or copying.
• Busiest combos: your top 5 by runs, as horizontal bars

Engine

• recordDaily counts runs, failures and seconds saved per local day. It keeps only the last 60 days, so the save file stays small.
• dailySeries fills days without runs with zeros.
• The snapshot includes player.daily. Older saves are upgraded automatically.

Design checks

• The bar color was checked with a palette validator for lightness and contrast against the panel in both themes: #d9661f on dark and #d9621b on light.
• Bars are thin, rounded at the top and sit on the baseline. The gridlines are faint.
• The hover area covers the whole day column, including its label.
• The chart is drawn at its real width, so labels stay 12px on phones. On narrow screens "Today" becomes a bold day letter so it doesn't collide.

Testing: npm test passes 49 tests, including a new test for daily counting, pruning and zero-filling. Checked in the browser in dark and light at 1100px and in dark at 390px: no horizontal scroll, tooltips work, and the console has no errors. The README has a new stats screenshot.

🤖 Generated with Claude Code

https://claude.ai/code/session_01Wm8TE3zwYDLddBccTdRBqf

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Generated by Claude Code

[coderabbitai]

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: af55f9d8-b80f-4f2d-bb24-25c974bff1ea

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