Merge pull request #901 from quoid/investigate-memory-usage2

fix: further reduces memory usage

Merge pull request #900 from quoid/memory-usage-analysis

fix: significantly reduces memory usage

build(release): v4.8.6, v1.8.6

build(release): v4.8.5, v1.8.5

build(release): v4.8.4, v1.8.4

build(release): v4.8.3, v1.8.3

build(gem): update fastlane

build(release): v4.8.2, v1.8.2

Merge pull request #864 from quoid/fix/863/content-scripts-memory-leak

fix: avoid browser tabs content scripts memory leak

fix: hide splitter when sidebar is hidden