feat(deps): react-number-format replaces hand-rolled CurrencyInput parser

The old CurrencyInput had ~100 LOC of regex-based parsing,
display-state syncing, and caret/focus juggling. react-number-format
ships a 17-LOC equivalent (NumericFormat with customInput pointing
at our shared Input shell) that handles the edge cases the hand-
rolled version missed: paste sanitisation, IME composition,
selection-caret preservation, locale separator switching.

Same external API on CurrencyInput so all 3 call sites
(berth-form, invoice-line-items, expense-form-dialog) keep working
without changes.

Verified: tsc clean, vitest 1315/1315, next build green.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -101,6 +101,7 @@
     "react-email": "^6.1.3",
     "react-hook-form": "^7.75.0",
     "react-image-crop": "^11.0.10",
+    "react-number-format": "^5.4.5",
     "react-resizable-panels": "^3.0.6",
     "recharts": "^3.8.1",
     "sharp": "^0.34.5",