chore(android): de-anchor ANDROID_PLAN.md from the docs, re-enable the APK workflow

Reword every code comment and doc that referenced ANDROID_PLAN.md or its stage anchors (§E, G-step-0, O1) so the living docs no longer depend on the plan file: .claude/CLAUDE.md, deploy/README.md, docs/ARCHITECTURE.md, docs/TESTING.md, ui/README.md, ui/android/.gitignore, ui/e2e/native.spec.ts, ui/src/lib/netstate.ts.

Re-enable the manual signed-APK workflow (android-build.yaml.disabled -> android-build.yaml; the CI host already has the Android SDK; workflow_dispatch-only, so it does not auto-run on this PR). Add docs/ICONS.md — the single-master icon/logo format reference (web, PWA, Android, future iOS, store listings).

docs/ICONS.md

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+# Icon & logo asset map
+
+> Single reference for every icon/logo format the project ships, and the
+> single-master workflow a rebrand should follow. Goal: one vector master →
+> regenerate every target, miss nothing. The iOS / iPadOS rows are **future**
+> (no iOS shell exists yet) but are listed so a rebrand covers them in one pass.
+
+## Current state — three drifting sources
+
+The «Э» mark is emitted today by three independent pipelines that visually drift
+(the favicon is a rounded bordered tile, the maskable is a full-bleed square, the
+Android launcher is an upscale). The rebrand collapses them onto one master.
+
+1. **Web favicon set** — `assets/icons/build/generate.js` composes SVG from font
+   glyph outlines (`assets/icons/build/glyphs.json`) and rasterises with the `ui`
+   package's Playwright chromium →
+   `ui/public/{favicon.svg, favicon.ico, apple-touch-icon.png, og-image.png}`.
+2. **PWA icons** — `ui/public/{icon-192, icon-512, icon-maskable-512}.png` are
+   hand-placed and covered by **no** generator (the main drift source).
+3. **Android** — `capacitor-assets generate --android` (`pnpm android:assets`)
+   expands `ui/assets/icon.png` into the launcher + splash matrix under
+   `ui/android/app/src/main/res/`.
+
+## Source masters (author once; commit)
+
+The minimum set the designer supplies so every target below regenerates:
+
+| Master | Size | Format | Background | Need | Drives |
+|---|---|---|---|---|---|
+| Vector mark | — | SVG | transparent | required | `favicon.svg`; the canonical shape |
+| App icon | 1024×1024 | PNG | opaque | required | Android legacy, PWA raster, iOS, store icons |
+| Adaptive foreground | 1024×1024 | PNG | transparent | recommended | Android/iOS adaptive foreground — mark inside the ~66 % safe area (outer third is masked) |
+| Adaptive background | 1024×1024 | PNG | opaque | recommended | Android/iOS adaptive background layer |
+| Maskable | 512×512 | PNG | opaque | recommended | PWA `maskable` (mark inside the maskable safe zone) |
+| Splash | 2732×2732 (+ a `-dark` variant) | PNG | opaque | optional | Android/iOS splash / launch screen |
+| OG card | 1200×630 | PNG | opaque | optional | link-preview card (mark **plus** wordmark text) |
+
+Capacitor reads the adaptive/splash masters from `ui/assets/`:
+`icon.png`, `icon-foreground.png`, `icon-background.png`, `splash.png`,
+`splash-dark.png`. Without the foreground/background pair it insets the single
+`icon.png` into the adaptive safe zone (today's poorer look).
+
+## Generated targets (full coverage)
+
+### Web — `ui/public/`, via `node assets/icons/build/generate.js`
+
+| File | Size | Note |
+|---|---|---|
+| `favicon.svg` | vector | canonical vector output |
+| `favicon.ico` | 32×32 | PNG-in-ICO; answers the blind `/favicon.ico` probe |
+| `apple-touch-icon.png` | 180×180 | opaque full-bleed; iOS Safari home-screen (iOS masks its own corners) |
+| `og-image.png` | 1200×630 | link-preview card; has the wordmark, referenced by absolute URL |
+
+### PWA — `ui/public/`, referenced by `manifest.webmanifest`
+
+| File | Size | `purpose` |
+|---|---|---|
+| `icon-192.png` | 192×192 | `any` |
+| `icon-512.png` | 512×512 | `any` |
+| `icon-maskable-512.png` | 512×512 | `maskable` |
+
+### Android — `ui/android/app/src/main/res/`, via `pnpm android:assets`
+
+Generated per density mdpi→xxxhdpi (exact px tool-managed); **do not hand-edit**:
+
+- `mipmap-*/ic_launcher.png` — legacy square (48 / 72 / 96 / 144 / 192)
+- `mipmap-*/ic_launcher_round.png` — legacy round
+- `mipmap-*/ic_launcher_foreground.png` + `ic_launcher_background.png` — adaptive layers
+- `mipmap-anydpi-v26/ic_launcher.xml` + `ic_launcher_round.xml` — adaptive descriptors
+- `drawable*/splash.png` — splash (portrait/landscape × light/night × density)
+
+### iOS / iPhone / iPad — FUTURE, via `capacitor-assets generate --ios`
+
+No iOS shell today; listed so the rebrand covers it. Same masters produce
+`App/App/Assets.xcassets/AppIcon.appiconset`:
+
+- Modern (Xcode 14+): a single **1024×1024** marketing icon; Xcode derives the rest.
+- Full asset-catalog px (if a full set is emitted): 20, 29, 40, 58, 60, 76, 80,
+  87, 120, 152, 167, 180, 1024 — iPhone {40, 58, 60, 80, 87, 120, 180}, iPad
+  {20, 29, 40, 76, 152, 167}, App Store marketing {1024}.
+- Splash: `splash-2732x2732.png` (+ dark) → the launch storyboard.
+- iOS icons are **opaque, no alpha, no rounded corners** (the OS applies the mask).
+
+### Store-listing art — uploaded by hand (outside the repo)
+
+| Store | Asset | Spec |
+|---|---|---|
+| RuStore (now) | app icon | 512×512 PNG |
+| RuStore | screenshots | phone, per the RuStore listing spec |
+| RuStore | promo / feature graphic | per the RuStore listing spec |
+| App Store (future) | marketing icon | 1024×1024 |
+| App Store (future) | screenshots | per device class |
+| Google Play (future) | icon / feature graphic | 512×512 / 1024×500 |
+
+## Regenerate
+
+```sh
+cd assets/icons && node build/generate.js    # web favicon set + og card -> ui/public/
+cd ui && pnpm android:assets                 # Android launcher + splash
+cd ui && node_modules/.bin/capacitor-assets generate --ios   # future, once the iOS shell exists
+```
+
+## Open items for the rebrand
+
+- Decide how the new vector master feeds `assets/icons/` — retarget the generator
+  onto the supplied vector, or drop in the output files and keep the generator for
+  the OG card only.
+- Bring `icon-192 / icon-512 / icon-maskable-512` under a generator (today
+  hand-placed — the main drift source).
+- Add `ui/assets/icon-foreground.png` + `icon-background.png` for a proper adaptive
+  icon (today a single inset `icon.png`).