TUI design polish: bordered titles, status pills, dense controls, hatched empty states

[21tmccauley]

What

A visual-design pass on the TUI, porting the design language of Posting (also a Textual app, so its patterns port as CSS + small widget tweaks). No behavior changes — layout, keybindings, and the api facade surface are untouched.

Panels — titles moved into the border frame (border_title, right-aligned). Panels rest at a 40%-alpha border and brighten to full $primary + bold title on :focus-within, so the active pane is always obvious, and every panel gained a content row. The Evidence files panel carries the selected run's scoreboard in its border title (run-id ✓ 4 ✗ 2).

Status pills — new palette.pill() / status_pill() helpers render statuses as readable text on a same-hue muted swatch (the exact text-*/*-muted pairs Textual derives for tokyo-night). Run statuses, manifest ✓/⚠ cells, upload preflight, and nonzero exit codes all route through them — replacing the hand-picked "green"/"red" literals that were duplicated across six screens.

Dense controls — inputs and buttons flatten to one row (Button's tall borders zeroed in every state). A focused input shows a wide $primary left edge with padding swapped so text never shifts. Top bars realigned for the new heights; modals got denser for free.

Chrome — thin 1-cell scrollbars tinted $primary (brighten on hover/focus), muted-bold DataTable headers, and render.py detail panes moved onto the Tokyo Night palette hexes so contract/entry views match the rest of the app.

Hatched empty states — a .panel tagged .empty swaps its table/log for a hatched, centered placeholder with the relevant keybind accented: Run before a run, Evidence with no runs / no files, Upload before an upload, Manifest when empty or unloaded. Cleared automatically when content arrives (the run console also clears on the run_start event so the synthetic-event test path behaves identically).

Verification

• Headless Pilot tour: every tab, both modal types, and a synthetic-event run (ok / partial / skipped / error / running variety) screenshotted at each state.
• Full test suite: 209 passed.

Notes for review

• The riskiest change is the global Input/Button restyle — only the states this app uses (base/hover/active, -primary, -error) are flattened; a future variant="success" button would regain tall borders.
• STATUS_TONE covers all eight runner statuses; unknown words fall back to muted text rather than crashing.
• docs/demo/tui.gif still shows the old design and needs regenerating (left out to keep this reviewable).

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