feat(home): render warning values as legible chips on filled surfaces

[Inakitajes]

Why

Home's selected-row fold and the worktree detail's identity zone paint a solid accent fill behind every fact. Warning values — the managed writer's live/uncertain liveness, an unknown dirt or changes observation, and an unavailable PR — kept their yellow ink on that fill, where yellow-on-accent measures about 1.26:1 in the dark palette and 1.21:1 in the light palette. The warning was signalled at the cost of the text being effectively unreadable: an operator could see that something needed attention but could not read what it said.

What

Ship the attached OpenSpec change accent-fill-warning-chips.

• A warning value on a filled surface (the selected row's fold and the detail's filled zone) now renders as a filled chip: the warning color becomes the background and a contrasting ink carries the text, preserving the warning signal and legibility.
• A warning value on a plain surface (the detail's remaining facts) keeps its yellow ink, already legible against the terminal background. Warnings are now context-sensitive: ink on plain surfaces, fill on filled surfaces.
• Adds a dedicated warning-chip color pair (warning / warningInk) to the dark, light, and neutral palettes, rather than reusing yellow, which is tuned as ink on a light canvas and too dark to serve as a fill there. The chip clears WCAG AA (≥ 4.5:1) against its ink in every palette and stays separable from the accent it rides.
• filledLines now preserves a chunk's own background the way highlighted already does, via the shared withFill helper.
• Reverses the prior deliberate contract that a warning "stays yellow on the accent fill".

Impact

• src/tui-theme.ts — warning-chip fill/ink pair added to all three palettes.
• src/home-tui.ts — warning values render as chips in the selected-row fold (inlineDetailLines) and the detail zone (detailLines); filledLines preserves existing backgrounds.
• test/home-tui.test.ts — chip contract replaces the "stays yellow on the accent fill" expectation; covers filled-chip vs plain-yellow-ink contexts across palettes.
• test/tui-theme.test.ts — WCAG contrast coverage for the warning-chip pair per palette.

How tested

• bun run typecheck — clean.
• bun test — 3268 pass / 0 fail.
• Delta specs for home-launcher updated in the archived change and synced to main specs.