feat: update logo with bolder strokes and regenerate icons/screenshots

Apply improved logo visibility (larger dots, higher opacity, thicker M
stroke) to all SVG sources, inline components, and regenerated all
PNG/ICO icons and desktop E2E screenshots.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Mohammod Al Amin Ashik <maa.ashik00@gmail.com>

Author: its-mash