feat: Apply amount.ts formatting utilities throughout all components

[T-kesh]

• Replace manual /1e7 and parseFloat operations with fromStroops(), toStroops(), and formatStreamRate()
• Add hasValidPrecision() validation to all amount inputs
• Fix NotificationDropdown.tsx manual formatting and syntax errors
• Update stream detail page to use proper amount utilities
• Add precision validation to AmountStep, TopUpModal, StreamCreationWizard
• Ensure consistent rate display across all stream cards
• Eliminate precision loss from manual calculations

closes #375

[ogazboiz]

hey, main was failing CI from broken auth imports + frontend parse errors. fixed and pushed to main now. please rebase to pick up the fixes:

git fetch upstream
git rebase upstream/main
git push --force-with-lease

if there's a conflict, resolve it locally and we'll review once CI is green.

[ogazboiz]

hey, since main now has #444 merged (the cancel stream endpoint), your branch is showing stale modifications to backend/src/controllers/stream/cancel.ts and backend/src/services/sorobanService.ts that overlap with main's current state.

please rebase again to drop those:

git fetch upstream
git rebase upstream/main
# during rebase, when conflicts appear in cancel.ts or sorobanService.ts:
git checkout upstream/main -- backend/src/controllers/stream/cancel.ts backend/src/services/sorobanService.ts
git add backend/src/controllers/stream/cancel.ts backend/src/services/sorobanService.ts
git rebase --continue
git push --force-with-lease

after that, your diff should only show the actual feature for this PR and we can merge.

[T-kesh]

hey, since main now has #444 merged (the cancel stream endpoint), your branch is showing stale modifications to backend/src/controllers/stream/cancel.ts and backend/src/services/sorobanService.ts that overlap with main's current state.

please rebase again to drop those:

git fetch upstream
git rebase upstream/main
# during rebase, when conflicts appear in cancel.ts or sorobanService.ts:
git checkout upstream/main -- backend/src/controllers/stream/cancel.ts backend/src/services/sorobanService.ts
git add backend/src/controllers/stream/cancel.ts backend/src/services/sorobanService.ts
git rebase --continue
git push --force-with-lease

after that, your diff should only show the actual feature for this PR and we can merge.

Alright then. I'll start working on that

[T-kesh]

hey, since main now has #444 merged (the cancel stream endpoint), your branch is showing stale modifications to backend/src/controllers/stream/cancel.ts and backend/src/services/sorobanService.ts that overlap with main's current state.

please rebase again to drop those:

git fetch upstream
git rebase upstream/main
# during rebase, when conflicts appear in cancel.ts or sorobanService.ts:
git checkout upstream/main -- backend/src/controllers/stream/cancel.ts backend/src/services/sorobanService.ts
git add backend/src/controllers/stream/cancel.ts backend/src/services/sorobanService.ts
git rebase --continue
git push --force-with-lease

after that, your diff should only show the actual feature for this PR and we can merge.

So I did that and the CI backend issue is back. Awaiting next review

[ogazboiz]

hey, main CI is fully green now. there were several real TypeScript and test issues from #444's merge that have all been fixed. please rebase one more time:

git fetch upstream
git rebase upstream/main
git push --force-with-lease

your PR's diff should be much cleaner after this rebase since main now has the canonical versions of cancel.ts, sorobanService.ts, and the withdraw test.

[T-kesh]

hey, main CI is fully green now. there were several real TypeScript and test issues from #444's merge that have all been fixed. please rebase one more time:

git fetch upstream
git rebase upstream/main
git push --force-with-lease

your PR's diff should be much cleaner after this rebase since main now has the canonical versions of cancel.ts, sorobanService.ts, and the withdraw test.

Done and all checks are green now. Please kindly review again

[ogazboiz]

hey @T-kesh, clean refactor. consolidating to use lib/amount.ts everywhere instead of the duplicated utils/amount.ts, plus adding precision validation on top-up amounts and a cancel button on stream details. all CI green. merging!

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