feat(ui): map canvas follows light/dark theme; fix invisible gear control

The map view now selects a DARK_THEME or LIGHT_THEME palette from the
resolved app theme and threads it through every primitive builder, so
the canvas, planets, ship groups, cargo routes, battle/bombing markers,
fog, reach + selection rings, pending-Send tracks, and the pick overlay
all switch with the rest of the chrome. A theme flip remounts the
renderer preserving the camera — Pixi bakes the background at init and
every primitive bakes its colour at build, so a live re-tint is not
possible on the same instance.

This also fixes the reported bug: the gear-popover trigger and the
loading overlay hardcoded a dark navy background, so in light theme the
gear was invisible (dark icon on dark chip) until hover flipped it to a
white chip. Both now use the --color-surface-overlay token and read
correctly in both themes.

The light palette mirrors the dark one role-for-role, darkened /
saturated for contrast on a light background while keeping the incoming,
battle, and bombing accents vivid. The values are a first pass meant to
be refined during the F8 manual-QA loop.

Removes the now-dead "Phase 35" references from the code and lifts the
map-recoloring prohibition from the design-system / renderer docs; the
battle scene stays a fixed-palette data-viz surface.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

docs/FUNCTIONAL.md

@@ -802,8 +802,9 @@ every change applies within one frame (no Pixi remount):
   off, hides every non-LOCAL planet that sits beyond
   `FlightDistance(localPlayerDrive)` of every LOCAL planet
   (torus-aware metric).
-- **View** — "visible hyperspace" toggle (slightly lighter
-  overlay outside the union of
+- **View** — "visible hyperspace" toggle (a faint overlay,
+  tinted to contrast with the active theme's map background,
+  outside the union of
   `VisibilityDistance(localPlayerDrive)` circles around LOCAL
   planets; LOCAL planets are always exempt — the toggle is
   named after the visible part of the map rather than the

docs/FUNCTIONAL_ru.md

@@ -823,8 +823,9 @@ Directory-промоушен ([Раздел 5](#5-реестр-названий-
   не-LOCAL планету, отстоящую дальше
   `FlightDistance(localPlayerDrive)` от любой LOCAL-планеты
   (метрика учитывает торическую развёртку).
-- **Вид** — переключатель «видимое гиперпространство» (чуть
-  более светлая заливка вне объединения окружностей
+- **Вид** — переключатель «видимое гиперпространство» (лёгкая
+  заливка, подобранная под фон карты активной темы, вне
+  объединения окружностей
   `VisibilityDistance(localPlayerDrive)` вокруг LOCAL-планет;
   LOCAL-планеты всегда вне фильтра — тоггл назван по видимой
   области карты, а не по затемнённой) плюс радиогруппа