Google Gemini - Custom Page Background (Light & Dark Mode)

Description

Sets the Gemini page background to #faf8f4 in light mode and #262624 in dark mode (including sidebar and top bar). In dark mode, uses #141413 as the message background color. Removes the blue tint from the left sidebar, hides the input-container ::before pseudo-element, sets .response-container background, sets --gem-sys-color--surface-container-high on .theme-host, hides .conversation-title-container, sets top-bar-actions to opacity 0, and hides .desktop-ogb-buffer.