Service tests hit empty, positive, negative, and exactly-zero cases,
verify debt_target is excluded from the calculation, and confirm
month_zero responds to applied updates. Route tests assert the zero
widget appears OOB on every mutation with the expected tone class.
Refs #7
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Single large number on /, Planned + Applied pair on /month/YYYY-MM,
both colour-coded (green at zero, amber positive, red negative).
Every mutation route (add, delete, month entry update) appends the
zero widget to its response with hx-swap-oob so totals stay in sync
without a full page reload. An _append_oob helper replaces the ad-hoc
string concatenation the target card was already using.
Refs #7
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
budget_zero sums income minus every non-income section on the budget
config. month_zero returns both Planned and Applied versions over a
month's entries. zero_tone classifies a value as zero / positive /
negative so templates can pick a colour.
Refs #7
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
