feat: режим индикаторов без цветовой кодировки + переустройство /setup

Новая настройка app_settings.indicator_mode (color | accessible), переключается
на /setup. В режиме accessible сигналы, которые раньше держались только на цвете,
переходят на форму/текст:
- качество цены (0-9) — 5-ступенчатый signal-meter вместо градиентной точки/числа;
  единый модуль web/static/price-quality.js, ветвление по window.QF_INDICATOR_MODE;
- вкладка «Ценообразование»: ведущая колонка-meter вместо заливки строк,
  пометка W вместо амбер-подсветки world-цен, ⚠ вместо красного «загрязнённого» итога.
- GET/PUT /api/settings/ui (без рестарта), регистрируется в обоих наборах роутов.

/setup переустроен: две колонки одной высоты, кнопка «Вернуться в приложение»,
исправлен <title>.

Документация: bible-local 02/03/04 + decisions/2026-08-31-accessible-indicator-mode.md

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LbRvQgPZpM4SJTaX3iLrXk

bible-local/decisions/2026-08-31-accessible-indicator-mode.md

@@ -0,0 +1,63 @@
+# Decision: `indicator_mode` — a colour-optional rendering mode for UI signals
+
+**Date:** 2026-08-31
+**Status:** active
+
+## Context
+
+Several UI signals were encoded by hue alone and unreadable with a colour-vision deficiency:
+
+- `price_quality` (0–9) as a red→yellow→green gradient — a dot in the configurator search
+  dropdown and inline before `lot_name`, a coloured number in the pricelist "Качество" column,
+  a full-row background tint on the "Ценообразование" tab;
+- the amber `world`-fallback price cell tint
+  ([2026-07-10-world-pricelist-fallback.md](2026-07-10-world-pricelist-fallback.md));
+- the red "contaminated total" in the pricing footer
+  ([2026-07-24-pricing-total-world-share.md](2026-07-24-pricing-total-world-share.md)).
+
+The bible has no dedicated accessibility contract, but `table-management` §Icon Semantics,
+`controls-selection` §Buttons, `go-code-style` §Business Logic Placement and `build-version-display`
+say the same thing: meaning is never carried by one ambiguous channel — back it with
+shape / number / explicit `title`+`aria-label`, and keep the indicator visually subordinate.
+
+## Decision
+
+One per-client preference, **`app_settings.indicator_mode`** = `color` (default) | `accessible`,
+set on `/setup` ("Настройки") via `GET`/`PUT /api/settings/ui` (`internal/handlers/settings.go`)
+— no restart. Deliberately named for the concern (how indicators are rendered), not for the
+current widget, so future colour-only signals attach to the same switch.
+
+`internal/handlers/web.go` `render()` and `internal/handlers/setup.go` inject the mode for every
+page; `base.html` publishes it as `window.QF_INDICATOR_MODE`. `web/static/price-quality.js` is
+still the single source of the price-quality scale and branches on the mode internally, so its
+call sites do not change.
+
+In `accessible` mode:
+
+- `price_quality` renders as a **5-step signal-strength meter** (`priceQualityLevel` =
+  `min(4, floor(score/2))` → `0-1 / 2-3 / 4-5 / 6-7 / 8-9`), five bars in one neutral hue, each
+  instance carrying `title`/`aria-label` = `Качество цены: N/9`. `qualityDotHtml` and
+  `qualityBadgeHtml` return the meter;
+- `qualityRowStyle` returns `''` — the pricing tab instead shows the meter in a narrow leading
+  column (conditional `<th>` / `colspan` in `index.html`, per-sub-row `<td>`);
+- the `world`-fallback amber class is dropped for a `W` superscript text marker on the price
+  (text, not a colour class — `applyCustomPrice`'s colour-stripping regex is a non-issue);
+- `_setPricingTotal` drops `text-red-600` for a leading `⚠` glyph, on the same trigger as the
+  red (`worldShare > 0`). The hover popup — including the "prices for N of M positions" coverage
+  line — is unchanged in both modes; per 2026-07-24 there is still no colour-coded coverage-only
+  signal, and `accessible` mode does not add one.
+
+`color` mode is byte-for-byte the previous behaviour.
+
+## Consequences
+
+- Default unchanged; nothing moves until a user opts in on `/setup`.
+- `web/static/price-quality.js` stays the only place that knows the 0–9 scale. Any new
+  colour-coded quality/price signal adds a branch there keyed on `isAccessible()`, never a local
+  reimplementation, and its `accessible` form must be shape/text, not another hue.
+- The pricing-tab tables have a mode-dependent column count (8 / 9). `index.html` guards the
+  `<th>`, the empty-state `colspan`, the `tfoot` "Итого:" `colspan` and the JS row template on
+  `ACCESSIBLE_MODE` / `{{ eq .IndicatorMode "accessible" }}`. CSV export is untouched — it reads
+  `data-*` row attributes, not cell positions.
+- New routes `GET`/`PUT /api/settings/ui`, registered in both the normal and setup-mode route
+  sets in `cmd/qfs/main.go`. `render()` nil-guards `localDB` for tests.