feat(reports): show per-project estimated tax and take-home

[0x054]

Summary

Reports now show what you actually keep, not just what you billed. With tax.set_aside_rate configured, the TUI reports screen and the CLI ttd report week/month/range project and client views gain est. tax and take-home columns next to billable value, and every report's totals line — including the day view — reports both figures. Without a rate, reports are unchanged: rate 0 means off, the same convention the quarterly tax dashboard uses.

Demo

Week of Jun 8 – Jun 14 2026
Project     ┃ Days ┃ Hours ┃ Activity ┃  Amount ┃ Est. Tax ┃ Take-Home
━━━━━━━━━━━━╇━━━━━━╇━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━━
acme/api    │ 1    │  4:00 │ ····█··  │ $600.00 │  $192.00 │   $408.00
acme/design │ 1    │  2:00 │ ····█··  │ $300.00 │   $96.00 │   $204.00
Total: 6:00  ·  $900.00 billable value  ·  $288.00 est. tax  ·  $612.00 take-home

Design notes

• Amounts reuse the same cents-aligned compute_set_aside math as the quarterly tax dashboard — no new tax primitives in core.
• Totals are summed from the displayed per-row values, so the columns always add up to the totals line.
• The TUI rebuilds its column set per render (config reloads fresh each render), so setting or clearing the rate mid-session updates the table on the next refresh.
• Projects with no hourly rate show — in the new columns and stay out of the tax totals, mirroring the existing Amount behavior.
• The CLI day view keeps its per-row columns lean (no per-cell tax) but still reports est. tax and take-home in the totals line.

Tests

Three new CLI tests (columns with a rate, day-view summary, hidden without a rate) and a TUI pilot test that also covers clearing the rate mid-session. Full suite: 282 passed, coverage 87%, ruff/ty clean.