Make the default the dashboard's light, not the system's

[sotashimozono]

I unified the two looks toward the wrong one. souta asked for the folder pages to be brought to the dashboard's look; what shipped brought the dashboard to the folder's, so choosing a dark scheme turned everything dark — including the page that had been the reference.

The theme stays. Seventeen schemes and the picker were never the problem. What changes is which one you get without choosing.

Which light

Compared by rendering the three light candidates, not by reading hex:

default-light     --bg #f8f8f8  --hover/--line #e8e8e8
github            --bg #ffffff  --hover/--line #f6f8fa
catppuccin-latte  --bg #eff1f5  --hover/--line #e6e9ef

the old dashboard --bg #ffffff  --hover #fafafa  --line #e3e3e3

github matches the background exactly and then puts #f6f8fa borders on a white page, which is no border at all — base16 maps base01 to both --hover and --line, and the dashboard had those as different colours. default-light's #e8e8e8 against the old #e3e3e3 keeps a card's edge.

auto was doing two jobs

It was the default and the name of the entry that follows the system. That worked only while they were the same idea. The moment the default became a real scheme the list had two entries called default-light, and theme_names_are_unique failed — which is what a test that counts is for. auto has its own constant now and is still in the picker.

Two more tests were right to fail:

• css_for fell back to the system pair for an unknown name. That was "the default" only while the default followed the system; it now falls back to the default itself, looked up rather than recursed into.
• the_default_carries_a_light_and_a_dark_palette was making a claim about auto under the default's name — the same confusion, one layer up.

For anyone who has already chosen

Nothing changes. A remembered theme still wins, which is why souta's own daemon stays on catppuccin-mocha until they pick otherwise.

230 tests, 65 e2e checks against a real host, fmt/clippy clean.

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
crates/ssh-browser/src/theme/mod.rs	85.71%	1 Missing ⚠️

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