feat: send many for web

[kyranjamie]

This PR adds the ability for users to send many recipients, a feature only possible on Stacks routing via a smart contract. This is mostly vibe coded as I wait for multi-wallet builds to finish.

cc/ @mica000 @fabric-8 for design input

cc/ @314159265359879 QA

[leather-bot]

Leather Web build 6496459 — Web preview, Web test report

[codecov]

Codecov Report

❌ Patch coverage is 0% with 425 lines in your changes missing coverage. Please review.
✅ Project coverage is 12.10%. Comparing base (73e6231) to head (6496459).
⚠️ Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
.../features/tools/send-many/send-many-transaction.ts	0.00%	140 Missing ⚠️
...ures/tools/send-many/components/send-many-form.tsx	0.00%	83 Missing ⚠️
...s/send-many/components/send-many-recipient-row.tsx	0.00%	60 Missing ⚠️
...ps/web/app/pages/advanced/tools/send-many.page.tsx	0.00%	56 Missing ⚠️
...b/app/features/tools/send-many/send-many-schema.ts	0.00%	41 Missing ⚠️
...pp/features/tools/send-many/send-many-constants.ts	0.00%	32 Missing ⚠️
...s/web/app/pages/advanced/tools/send-many.route.tsx	0.00%	7 Missing ⚠️
apps/web/app/pages/advanced/advanced.page.tsx	0.00%	5 Missing ⚠️
apps/web/app/routes.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2174      +/-   ##
==========================================
- Coverage   12.15%   12.10%   -0.06%     
==========================================
  Files        2384     2391       +7     
  Lines       97436    97861     +425     
  Branches     3992     3999       +7     
==========================================
  Hits        11848    11848              
- Misses      84576    85001     +425     
  Partials     1012     1012              

Files with missing lines	Coverage Δ
apps/web/app/routes.ts	0.00% <0.00%> (ø)
apps/web/app/pages/advanced/advanced.page.tsx	0.00% <0.00%> (ø)
...s/web/app/pages/advanced/tools/send-many.route.tsx	0.00% <0.00%> (ø)
...pp/features/tools/send-many/send-many-constants.ts	0.00% <0.00%> (ø)
...b/app/features/tools/send-many/send-many-schema.ts	0.00% <0.00%> (ø)
...ps/web/app/pages/advanced/tools/send-many.page.tsx	0.00% <0.00%> (ø)
...s/send-many/components/send-many-recipient-row.tsx	0.00% <0.00%> (ø)
...ures/tools/send-many/components/send-many-form.tsx	0.00% <0.00%> (ø)
.../features/tools/send-many/send-many-transaction.ts	0.00% <0.00%> (ø)

Components	Coverage Δ
bitcoin	62.80% <ø> (ø)
query	24.49% <ø> (ø)
utils	87.10% <ø> (ø)
crypto	70.62% <ø> (ø)
stacks	49.42% <ø> (ø)

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[fabric-8]

Hey @kyranjamie, here's a tweaked up version to make this feel a bit more polished — No dramatic changes just, a few adjustments around element grouping, spacing, alignment, and colors. Pick whatever tweaks you feel are reasonable regarding effort/reward ratio ;) We can also team up briefly to jam through the changes together