fix: resolve all known swap+send bugs

[BZahory]

Description

A number of minor bugs have been discovered during the official QA process of Swap+Send; this PR aims to resolve all of them without regression.

Related issues

METABRIDGE-843

Fixes:

Manual testing steps

1. Test all issues with a send-swap label
2. Ensure they are no longer present
3. Ensure Swap+Send continues to work as expected

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I’ve followed MetaMask Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[micaelae]

what does this do?

seeing some odd behavior when I enter a long number like 0.12414314125153525326236. only the ending numbers are displayed on unfocus. also happens when I hit Max and my balance has a lot of trailing numbers

[codecov]

Codecov Report

Attention: Patch coverage is 57.44681% with 40 lines in your changes missing coverage. Please review.

Project coverage is 65.64%. Comparing base (ddf0e93) to head (d6536aa).

Files	Patch %	Lines
ui/ducks/send/send.js	53.97%	29 Missing ⚠️
...r-amount/asset-picker-modal/asset-picker-modal.tsx	57.69%	11 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop   #25100   +/-   ##
========================================
  Coverage    65.64%   65.64%           
========================================
  Files         1362     1362           
  Lines        54151    54189   +38     
  Branches     14074    14112   +38     
========================================
+ Hits         35546    35572   +26     
- Misses       18605    18617   +12     

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[metamaskbot]

Builds ready [d6536aa]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (118 ± 157 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	60	98	76	8	4
		domContentLoaded	8	19	10	2	1
		load	38	1542	118	327	157
		domInteractive	8	19	10	2	1

Bundle size diffs [🚨 Warning! Bundle size has increased!]

• background: 0 Bytes (0.00%)
• ui: 370 Bytes (0.01%)
• common: 999 Bytes (0.02%)