Retheme the Textual TUI under the Australis Dark colorscheme
(github.com/lkraven/australis) — Aurora blue/cyan/green primary,
Ice neutrals (#222531 bg, #a9bcc3 fg, #cce7ec highlight), Sea
darks for chrome separators, Dawn accents reserved for terminal-
event labels (red/yellow). 16-color cool-tone palette with medium
contrast.
Mechanism: Textual `Theme` API. AUSTRALIS_THEME defined at module
scope mapped to semantic tokens (primary/secondary/accent/success/
warning/error/foreground/background/surface/panel) plus a Sea
variables block (`au-dark-30..60`, `au-bright-70/80/white`, plus
Aurora bright variants). Both `RatatoskrApp` and `AgentPickerApp`
register the theme in `__init__` and set `self.theme = "australis"`.
Per-widget styling via DEFAULT_CSS theme variables (no hex
sprinkled in CSS):
- `#identity` → `$au-bright-blue` (Aurora bright-blue).
- `#pane-name` → `$au-bright-cyan` (current-pane indicator).
- `#hint` → `$au-dark-60` (subtle Ctrl-C state line).
- `#prompt` border → `$panel` unfocused / `$primary` focused
(focus highlight in Aurora blue).
- `#left-column` gets a `border-right: solid $panel` separator.
- `#thinking-current` color → `$au-dark-60` (matches demoted style).
- `#transcript` + `#tools-log` background → `$background`.
- Agent picker's highlighted ListItem → `$primary` bg +
`$au-bright-white` fg.
Rich Text styling (where Textual's theme system doesn't apply):
- `_dim()` helper for demoted telemetry now uses explicit
`#86929d` (Sea dark-60) instead of the terminal-dim filter
`"dim"`. Renders consistently across emulators and stays
anchored to the brand palette.
- User-prompt echo (`❯ <content>` in transcript) wrapped in
`RichText` styled with `#42dcd1` (Aurora bright-cyan) — calls
out the operator's voice in the primary palette.
CLI mode (`--send`) is unaffected by design — raw stdout has no
theme concept. The retheme is TUI-only.
236/236 tests GREEN; ruff clean. Live smoke against personal
Worldtree: `app.theme == "australis"`, all widget colors resolve
to expected Australis hex values (identity → `#a4c4ff`,
pane-name → `#42dcd1`, hint → `#86929d`).
One existing test adjusted: `test_worker_phase_demoted` previously
asserted `style == "dim"`; now asserts non-empty style (the demoted
style is now an explicit Australis hex, not the terminal "dim"
sentinel). Behavior-equivalent — the demotion intent is preserved.
Patch bump (v0.4.0 → v0.4.1) per SemVer etiquette: cosmetic
refinement of just-shipped surface, no public-API change.
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