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ui: light theme by default (dark is opt-in)

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Swaps the role of `:root` (now light) and the data-theme attribute
(now `[data-theme="dark"]`) in cassandra.css, flips the localStorage
fallback from 'dark' to 'light' in base/login/verify templates, and
updates the theme-toggle label and the branding-consistency test
selectors to match.

Existing users with cassandra.theme=dark in localStorage still see
dark — their explicit preference wins. Only first-time visitors and
users with no stored preference shift to light.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Giorgio Gilestro 2026-05-22 21:51:23 +01:00
parent 9e058144ec
commit 89632e9937
6 changed files with 42 additions and 39 deletions
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9
app/branding.py
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@ -16,10 +16,11 @@ detection test (`tests/test_branding_consistency.py`) parses
`cassandra.css` and asserts every variable matches. Update both or
neither.
The light theme is the *default* in emails — mail clients can't read
`localStorage`, so we can't replicate the dashboard's user-toggled
theme. Clients that honour `prefers-color-scheme` get the dark palette
via media query.
The light theme is the *default* everywhere — dashboard `:root` block,
auth pages, and emails. Dark is opt-in via the in-app toggle (which
sets `data-theme="dark"` on `<html>` and persists in `localStorage`).
Mail clients that honour `prefers-color-scheme: dark` get the dark
palette via media query.
"""
from __future__ import annotations