Three things that were asked for and were genuinely missing:

1. ضريبة كسب العمل had no screen at all — the brackets lived only in
   hr_tax_brackets and could only be changed with SQL. Adds a proper
   admin screen: brackets are versioned as a set per effective_date,
   old sets are kept (never deleted) so past payroll stays explainable,
   and activating a set deactivates the others. The form validates that
   brackets are contiguous, that only the last one is open-ended, and
   auto-fills the next bracket's start. A built-in simulator shows the
   tax on any annual income so the accountant can verify the set before
   running payroll.

   Also hardens the live calculator: IncomeTaxService summed every row
   flagged active regardless of effective_date, so two overlapping
   active sets produced a silently wrong tax. It now uses the newest
   active set only.

2. The voucher screen searched the entire chart of accounts for both
   sides, so you could pick a fixed-asset account as the cash side or a
   cash account as the expense side — the latter trips the "same as the
   cash account" guard and the voucher just refuses to save. The lookup
   is now scoped per side: cash/bank accounts for the counter side, and
   expense (صرف) or revenue (قبض) accounts for the line side depending
   on the voucher's direction.

3. The accounting gaps screen showed only a count per gap. Each gap now
   has a "عرض التفاصيل" button that lists the actual documents behind
   that number — id, date, party, quantity, recorded amount and status
   — so the accountant can check the cases before choosing a rate.