[usermaneGermane]

Step 1 of the new look (direction "Soft", chosen from the mock-ups). Version 3.1.0-alpha.1, a test version; Latest stays 3.0.0.

What changes

• Light and dark. Every colour in theme.py is now a (light, dark) pair in the new palette. The app follows the system, and Settings → Appearance switches to light or dark.
• A typeface of its own. Manrope (SIL Open Font License) is bundled as Regular and Bold and loaded at start. Without the files the app falls back to Segoe UI.
• Tiles are pastel with a dark letter in both modes.
• Pilot window: Vaults → Members. A header band in the vault's colour, the fingerprint on a card with a Copy button, a round avatar per member, rows without borders.
• No other screen changes its layout yet: they get the new colours and font only. The main window, login and the rest follow in later PRs.

Not in this PR

• SecretSpace for Linux gets the same after the pilot is approved.
• The strength meter's colours are unchanged and are pale on the light theme.
• The login backdrop is painted for the mode in use when the screen opens; it does not repaint if the system switches while the login screen is showing.

Tests

• test_look.py: pairs, pick(), the backdrop in both modes, WCAG AA contrast (4.5 : 1) for the colour pairs used together, the bundled font.
• Full suite: 738 passed, 2 skipped.
• Lab flows through the real windows: accounts 42/42, sync 22/22, vaults 56/56, sharing 101/101, recovery 83/83.
• Screenshots of the sharing windows checked in light and dark.

🤖 Generated with Claude Code

https://claude.ai/code/session_011ojnyVg7ccsR3pZ64s7aRH