fix: soften dark theme sidebar text colors to reduce eye strain

Toned down pure white text and bright highlights in the sidebar for
better readability against the #252525 dark background.

Author: abose

src/styles/brackets_theme_default.less

@@ -94,13 +94,13 @@
 @project-panel-base-color: @bc-project-files-bg;
 @bc-working-set-bg: #2f2f2f;
 @bc-project-files-bg: #252525;
-@project-panel-text-1: #ffffff;
-@project-panel-text-2: #adb9bd;
+@project-panel-text-1: #e0e0e0;
+@project-panel-text-2: #a8b0b4;
 @main-toolbar-background-color: #252525;
 
 /* open working file highlight */
-@open-working-file-name-highlight: #8fddff;
-@open-working-file-ext-highlight: #8fddff;
+@open-working-file-name-highlight: #85d0f0;
+@open-working-file-ext-highlight: #85d0f0;
 
 /* selection colors */
 @selection-color-focused: #abdffa;