Palette foundation source handoff

2026-09-12. Root owns issue #26, integration, compiler gates and native acceptance. This is an isolated candidate implementation, not issue closure or an accepted display result.

Branch: codex/palette-foundation-956atf-20260912
Worktree: .local/palette-foundation-20260912
Base: f6595ebf66e88ec42c37b5c1a3c014f5e52cb32d
Contribution: 02c2f6f46e57cf2cb00c2df789fbbad6caf973e7 — Strengthen palette roles and source selection contrast
Scope: exactly four files below. No behavior, architecture/state painter, lifecycle, lexer, source action/persistence, manifest, dependency or root tracked changes.

Implemented candidate

style::theme() uses the installed Theme::custom_with_fn API and explicit shared Extended pairs. Existing application/input BG is preserved. Semantic secondary ink is #4B5968; teal is #00665C. Essential pub const BOUNDARY is #667586, distinct from unchanged decorative LINE. It already supplies input/pick-list/menu/checkbox boundaries through the theme and is ready for the independently owned canvas-consumer replacements.

This is A refined, not original A unchanged: parent chose a slightly darker global ink to make ordinary selection both visible and readable without changing the surface. Final INK #18212C and ordinary input selection #7B8E86 have approximately 4.684305 value/selection, 3.137133 selection/BG and 14.695286 value/BG contrast. Comparison #1C2530 / #7C9188 yielded only 4.616181 and 3.033414 for the first two measures. These are source-color arithmetic; actual f32-resolved Rust tests remain unrun.

The actor, generic and amber kind-color families darken to A's proposed values. Existing category mapping and the other kind families remain. Shared teal darkens activity/function colors naturally. No category semantics, text, shapes or lexer classes change.

Selected navigation retains a light #D9EEE8 fill and gains a 2 px teal outline, using the existing style API. It no longer overwrites disabled text opacity inherited from the base navigation style. This is an outline, not a new leading marker or focus-management implementation.

The single source editor call gains .style(style::source_editor). Its white surface, #80958B selection and #212529 fallback/placeholder/caret are separate from ordinary input values. highlight::format uses the exact seven S2 colors from the selection remedy, with unchanged font and lexer behavior. S2 source arithmetic gives 3.186824 selection/surface and at least 4.835525 selected-token/fallback contrast. No range tracking, additional retokenization or selected-foreground lifecycle is added.

Shared-role couplings and implementation choice

Iced Pair::new silently adjusts text using Color::is_readable_on's 6.0 threshold. Therefore the generator uses a local Pair-literal constructor to preserve reviewed values exactly; resolved tests enforce the intended consumer contrasts. It does not rely on Iced's adaptive color output or introduce a theme abstraction.

background.weak supplies white pick-list/menu/hovered unchecked-checkbox and disabled-input surfaces. It is not darkened as a border token.
background.strong supplies BOUNDARY borders and the disabled checked primary checkbox fill. Its own text pair is white; some checkbox variants use other pair text, so pair-local checks alone would not suffice.
secondary.base supplies both MUTED placeholders and secondary-button fill. Its text is white, with a darker explicit hover fill.
Primary base/strong supply teal actions, focused/open borders, checked boxes and menu selection. Hovered buttons and checkboxes can retain base text while consuming strong fill; the tests check resolved output.
primary.weak.color supplies ordinary input selection. The source editor overrides selection/value/surface locally rather than forcing S2 onto ordinary fields.
Shared success/warning/danger pairs are explicit and coherent with the light theme. Existing disabled-button alpha behavior is retained and is not evaluated as if it were opaque active text.

Verification performed and deferred

Performed in the isolated worktree: source/API inspection, rustfmt --edition 2024 --config skip_children=true on the four owned Rust files (exit 0), and git diff --check (exit 0). The view diff is exactly one style call. Git commit succeeded and the worktree status was clean immediately afterward. No Cargo, rustc, native UI or Gitea operation was performed.

Seven tests are declared, not run in style/tests.rs:

semantic_text_and_essential_boundaries_have_contrast_on_canvas_surfaces
source_editor_syntax_and_fallback_remain_readable_during_selection
default_input_styles_keep_ordinary_values_and_visible_selection
default_pick_list_and_menu_styles_cover_open_and_selected_states
default_checkbox_styles_keep_checks_and_outlines_distinct
button_pair_couplings_cover_hover_and_disabled_states
selected_navigation_adds_a_visible_outline_and_preserves_disabled_ink

They use actual theme, formatter and Iced default style functions, not a copied hypothetical palette. They cover all 39 kind headers on the painter's tint, relevant diagram surfaces, every source class, enabled input statuses, disabled input values, opened pick lists/selected popup rows, checked/unchecked primary boxes, five filled button families across active/hover/pressed, and disabled/nav behavior. Opaque contrast helpers reject alpha/gradients rather than mismeasure them. Disabled button alpha and inactive unchecked borders are explicitly exempt from active-state contrast floors; this does not claim their perceptual quality is verified. Non-default success/secondary/danger checkbox variants are not used by current production call sites and are not claimed covered by the primary-checkbox evaluator.

After the parent combines the independently owned painter contribution and grants a compiler lease, a targeted command is:

cargo test --locked -p oa-desktop --bin arcadia-studio style::tests -- --nocapture

Use the parent's identified-input Windows gate environment and isolated/serialized target policy. Require a listing selecting all seven tests; compilation alone or zero selected tests is not evidence. The normal integrated full/strict and native gates remain necessary. No compile success is claimed here.

Remaining acceptance and geometry boundaries

Actual candidate rendering, syntax hue scanability, display degradation and native editing tasks are unverified. Near-black syntax is an explicit tradeoff, with improved foreground/range contrast but less saturated scanning information.
Essential canvas LINE/edge consumers remain for the parent's separate contribution; exposing BOUNDARY alone does not change those still-hardcoded outlines. Shared token consumers naturally receive changed INK/MUTED/TEAL values.
Warning-route symbols, state-row selection markers and any separate focus geometry are not implemented in these four files. A selected nav outline does not imply keyboard-focused buttons receive a new focus indicator.
Iced can produce no selection rectangles for newline-only selection and omit blank-line fill; range paint disappears on blur. These source-derived geometry limits remain unchanged. The native acceptance matrix in the selection remedy includes them and must record actual behavior rather than silently narrowing universal selection visibility.
Existing painter-continuity screenshot predicates may depend on old selected colors. Update only the color recognition when combining, while retaining the geometric continuity requirement.

Exact payload hashes

File under the worktree	SHA-256
`crates/oa-desktop/src/style.rs`	`924e6a92bc28c9f07936c8ab0bc41b6f097956ef4c0e24a571d7fa6fb6591382`
`crates/oa-desktop/src/style/tests.rs`	`4a3f7486bfa85129d1504f7a0990e28325bd704770f814f255d5044996246dcd`
`crates/oa-desktop/src/highlight.rs`	`8222e2deed5d60ea522241ccb2c653caf50ecc1d4404d633f54e0193c5f622e9`
`crates/oa-desktop/src/views.rs`	`1c0b1197d3bf3d3f7aaaea2cf8a89bf4f7e2634e65345f81693fc91df151b9c3`

Parent owns independent review, combination, execution, evidence archive and any eventual acceptance/publication.

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