fix(client): the folder picker had no background, and its field no layout

Two defects from one screenshot, and a test for the class behind the first.

**The modal was transparent.** `.ftp-panel` asked for `var(--bg-panel,
var(--bg))` and this stylesheet defines neither — the palette is `--bg-base`,
`--bg-surface`, `--bg-raised`. An unknown custom property makes the whole
declaration invalid while the rule around it still applies, so the panel simply
had no background and the page showed straight through it. Three more of mine
were the same: `--bg-hover`, `--bg-input`, `--danger`.

**The field had no layout.** It was built on `.settings-row`, which is
`display:flex; justify-content:space-between` — so a label, a hint and a value
inside one end up spread across a single line in source order, which is how it
read as three unrelated fragments per app. It is its own block now, and the
chosen folders are a table borrowing `.shared-dirs-tbl`: these are lists, and a
wrapped run of chips gives nothing to scan and nowhere to put a per-row remove.
The operator is looking at two lists of directories on one page and they should
read alike.

`test_css_variables.py` is the general form. CSS fails silently and generously
here, and nothing checked. It found four more that predate this branch: the
unread-count badge (`--danger`) had white text on nothing, a transfer link had
no colour, a notification card had no rounding and no unread marker. Fixed, and
`--warn` and `--accent-bg` are promoted from literal fallbacks to real palette
entries at exactly their current light values.

Two of its own regexes were wrong before they were right — a scoped definition
written inline, and one preceded by a comment, were both reported as undefined.
A third check comparing the two palettes fired on `--border-focus`, a focus
ring the themes share deliberately; a heuristic that has to be explained away
on its first run is worse than no test, so it is gone rather than exempted.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011pvMdvLBG92jyhvD5pD6us

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