feat: invoice share context, CSV trim, duplicate rename, export date-…

[cyberpunk30]

Title:

feat: invoice share context, CSV trim, duplicate rename, export date-range

Body:

Closes #601
Closes #602
Closes #603
Closes #604

Summary

Implements four independent UI/UX improvements across the invoice modals.

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#601 — InvoiceShareQRModal: show invoice context in header

The modal header was context-free. Added two optional props (invoiceTitle, totalAmount) so
callers can pass invoice details directly into the modal. The header now renders:

• Invoice title (falls back to Invoice #<id> when absent)
• Total amount + currency below the title
• "Share via QR Code" as a subtitle

All header text uses truncate so it degrades gracefully on narrow viewports.

File: src/components/InvoiceShareQRModal.tsx

---

#602 — CsvRecipientImport: trim whitespace before validation

CSV exports from spreadsheet tools often include leading/trailing spaces in address cells,
causing silent validation failures. Fixed in two places:

• parseCsv: each field (address, percentage, amount) is now explicitly trimmed after
  column extraction.
• handleUpdateRow: inline-edited values are trimmed before re-running validation.

Genuinely malformed addresses still produce the "Invalid Stellar address" error as before.

File: src/components/CsvRecipientImport.tsx

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#603 — DuplicateModal: editable name field

The duplicate was always created with an auto-generated name (Copy of Invoice #<id>) and no way
to change it before saving. Added:

• A text input pre-filled with the auto-generated name
• Trim + empty-string validation with an accessible inline error (role="alert")
• onConfirm signature updated to (name: string, deadlineIso: string)

File: src/components/DuplicateModal.tsx

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#604 — ExportModal + API: date-range picker with defaults

Exporting all invoices with no date constraint was impractical for long-running accounts.
Changes:

• From defaults to 30 days ago, To defaults to today (YYYY-MM-DD)
• Each picker has a visible label ("From" / "To")
• Client-side validation blocks export and shows an inline error when From > To
• The apiFetch call now appends ?from=...&to=... query params
• The API route reads those query params, merges them into the filter options (overriding body
  values), and returns 400 if from > to

Files: src/components/ExportModal.tsx, src/app/api/invoices/export/route.ts

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Testing

• All existing tests continue to pass (no test logic was modified)
• Each acceptance criterion from the four issues is satisfied

The Closes #601 … Closes #604 lines will auto-close all four issues when the PR is merged on
GitHub.

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