(#178) improve negative rate representation

[ryanw-mobile]

Added a new colour spectrum (freezing blue) to represent a negative rate. This spectrum supports the dark theme in the way that it reverses the ordering when in dark mode.

Also, on the Agile screen, when the negative rate is active, the arc changes to animate the colour range.

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: -0.03% (target: -1.00%)	:white_check_mark: ∅

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (d74bf86432c01a0163958456211966480db82829) | 1705 | 780 | 45.75% | | | Head commit (b289f883dd1a5142086762b89e1bc76b96ef48e8) | 1704 (-1) | 779 (-1) | 45.72% (**-0.03%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#199) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 42.65%. Comparing base (d74bf86) to head (3688d11).

:exclamation: Current head 3688d11 differs from pull request most recent head b289f88

Please upload reports for the commit b289f88 to get more accurate results.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #199 +/- ## ========================================== - Coverage 42.69% 42.65% -0.04% ========================================== Files 91 90 -1 Lines 1642 1641 -1 Branches 226 226 ========================================== - Hits 701 700 -1 Misses 884 884 Partials 57 57 ```

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