fix: show totals in chart legend and days in Time Spent budgeted sub-text

[EdiWeeks]

Summary

Two small project-details-page fixes on the same screen:

• Hours per Week chart legend — shows the sum of Planned, Approved and Pending hours across the visible weeks (e.g. Planned (237.0h) Approved (158.5h) Pending (10.0h)). Totals re-compute when navigating weeks via the arrows / "This Week" button. Implemented via a legendTotals useMemo derived from the same displayData that drives the bars.
• Time Spent card — the "X% of Yh budgeted" sub-text now uses the shared formatHoursWithDays helper, so it shows 71% of 237.0h (31.5d) budgeted instead of 71% of 237h budgeted. Matches the format already used on the neighbouring Time Budgeted card.

Test plan

• Open project details for PR00010 — Cairn Homes – Support & Maintenance.
• Hours per Week legend reads Planned (Xh) Approved (Yh) Pending (Zh) and the figures sum to the visible bars.
• Click the previous-week / next-week arrows or "This Week" — the legend totals update to match the new visible window.
• Time Spent card sub-text reads X% of <budget>h (<budgetdays>d) budgeted, matching the format on the Time Budgeted card next to it.
• No regression on the Spend vs Budget chart (separate legend, untouched).

Fixes #202
Fixes #203

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