Expand Rewards to three decimal places

[tmancey]

Resolves brave/brave-browser#10027

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Verified that these changes build without errors on
  • Android
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that these changes pass automated tests (unit, browser, security tests) on
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that all lint errors/warnings are resolved (npm run lint)
• Ran git rebase master (if needed).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Request a security/privacy review as needed.
• Add appropriate QA labels (QA/Yes or QA/No) to include the closed issue in milestone
• Public documentation has been updated as necessary. For instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protections
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-compatibility-issues-with-tracking-protection
  • https://github.com/brave/brave-browser/wiki/QA-Guide

Test Plan:

See brave/brave-browser#10027

Reviewer Checklist:

• New files have MPL-2.0 license header.
• Request a security/privacy review as needed.
• Adequate test coverage exists to prevent regressions
• Verify test plan is specified in PR before merging to source

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on.
• All relevant documentation has been updated.

[tmancey]

Failed CI for Linux and macOS, restarting

[NejcZdovc]

One was missed https://github.com/brave/brave-core/blob/master/components/brave_rewards/resources/page/components/pageWallet.tsx#L552

[NejcZdovc]

PR looks good to me. Waiting for confirmation from design team

[NejcZdovc]

please fix browser tests

[tmancey]

CI failed for known test-install issue

[LaurenWags]

Verified using

Brave | 1.12.48 Chromium: 83.0.4103.116 (Official Build) nightly (64-bit)
-- | --
Revision | 8f0c18b4dca9b6699eb629be0f51810c24fb6428-refs/branch-heads/4103@{#716}
OS | macOS Version 10.14.6 (Build 18G3020)

The following areas of the UI were checked to confirm 3 decimal places were shown (note, not all screenshots were taken using the same profile).

1. Auto Contribute Panel on brave://rewards

2. Tip panels on brave://rewards

3. Rewards Widget on NTP:

4. Claiming Ad or UGP grant:

5. Wallet summary panel on brave://rewards

6. Tip banners (one time and recurring for both before and after tipping):

7. Summary from BAT logo:

8. Monthly Statement:

9. Ad panel on brave://rewards:

10. Recurring tip amount display on panel:

Logged follow up issues for the wallet summary on brave://rewards page going to 2 lines but summary on panel stays on one line - brave/brave-browser#10446