UsageScreen: Add button to jump back to latest readings

[ryanw-mobile]

Added a new button on the navigationOptionsBar, so we can jump back instantly to the latest readings under the current selected presentation style.

also added an experimental feature by hiding loading screen on AgileScreen when we already have something to show, so that the transition animations are not wasted.

[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 (03d6bfd2880e51d9cb5a1c5bc77855455821f541) | 2085 | 1388 | 66.57% | | | Head commit (adeab7e611fb8ca57f8769ad026e9c06978ab9fb) | 2086 (+1) | 1388 (+0) | 66.54% (**-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 (#241) | 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[bot]]

Codecov Report

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

Project coverage is 61.61%. Comparing base (03d6bfd) to head (adeab7e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #241 +/- ## ======================================= Coverage 61.61% 61.61% ======================================= Files 102 102 Lines 2001 2001 Branches 321 321 ======================================= Hits 1233 1233 Misses 649 649 Partials 119 119 ```

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