Three visual bugs from the t-146 PoC ship.
1. Bubble alignment robustness — keep `align-self: flex-end/-start`
but also pin with `margin-left/right: auto`. align-self was already
correct in CSS, but layered margin-auto makes the alignment
bulletproof against any future cross-axis override.
2. Dark-mode contrast — paliadin CSS used three undefined tokens
(`--color-accent-tint`, `--color-status-red`, `--color-status-red-tint`,
`--color-surface-hover`) whose hardcoded fallbacks (`#e8fbb2`, `#fee`,
etc.) always fired. In dark mode the user bubble rendered light cream
text on light-lime background, the error bubble light cream on light
pink — both unreadable. Repointed to the project's actual tokens:
`--color-bg-lime-tint` (defined in both modes), `--status-red-fg/bg/border`
(defined in both modes), `--color-surface-2` for the starter hover.
Added explicit `color: var(--color-text)` to `.paliadin-bubble` and
`color: var(--status-red-fg)` to the error variant. Same root cause as
t-paliad-144's contrast sweeps (cf. memory `paliad: undefined --color-bg-muted token`).
3. Friendly tmux-unavailable error — Dokploy container has no tmux/claude
CLI per CLAUDE.md, so prod hits `event: error` with
`{"code":"tmux_unavailable", ...}`. The client used to dump the raw
JSON into the bubble. Now `friendlyErrorMessage()` parses the payload
and shows a localised "Paliadin läuft nur lokal" notice (DE+EN), with
a `connection_lost` fallback for native EventSource transport errors
(no `data`) or anything we don't recognise. Same code path also
replaces the generic "Fehler beim Senden: …" pre-SSE catch block with
`paliadin.error.upstream` so transport errors don't leak `String(err)`
into the UI either.
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