fix(ohos): show Robrix launcher icon instead of makepad placeholder

packaging/ohos/README.md

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+# HarmonyOS (OpenHarmony) app icon
+
+Robrix's branded launcher icon for the HarmonyOS build lives here, plus a script
+that applies it to the generated DevEco project.
+
+## Why this exists
+
+`cargo makepad ohos ... deveco` scaffolds the DevEco project from cargo-makepad's
+built-in template. That template ships **makepad's placeholder icon**, and the ohos
+generator has **no hook to use the project's real icon** (the Android path does —
+it reads `[package.metadata.makepad.android].icons` in `Cargo.toml`). The project is
+also regenerated under `target/` on every `deveco` run, so the icon cannot simply be
+committed into the generated tree.
+
+So without this step, Robrix shows the generic makepad icon on the HarmonyOS launcher
+instead of the Robrix logo.
+
+## Files
+
+| File | Used by | Notes |
+|------|---------|-------|
+| `media/foreground.png` | `$media:foreground` (layered launcher icon) | 288×288, transparent cube in the Ø192 safe zone |
+| `media/background.png` | `$media:background` (layered launcher icon) | 288×288, solid white |
+| `media/app_icon.png`   | `AppScope/app.json5` → `$media:app_icon` | 216×216, cube on white |
+| `media/startIcon.png`  | `EntryAbility` → `$media:startIcon` | 288×288, cube on white |
+
+The launcher icon follows HarmonyOS's **layered icon** convention: a transparent
+foreground (the Robrix cube, kept inside the Ø192 safe area) over a solid background,
+with the system supplying the mask and elevation — no baked-in card/shadow. The cube
+artwork is derived from `resources/robrix_logo_alpha.png`.
+
+## Build flow
+
+Run the icon step between `deveco` and `build`:
+
+```bash
+# 1. generate the DevEco project + cross-compile librobrix.so
+cargo makepad ohos --deveco-home="/Applications/DevEco-Studio.app/Contents" deveco -p robrix --release
+
+# 2. inject Robrix's icon (this script) — must come after deveco, before build
+packaging/ohos/apply-app-icon.sh
+
+# 3. package the .hap
+cargo makepad ohos --deveco-home="/Applications/DevEco-Studio.app/Contents" build -p robrix --release
+```
+
+## Follow-up
+
+The proper long-term fix is upstream: teach cargo-makepad's ohos generator to read the
+project's icon (as the Android path already does) and generate the layered icon, which
+would make this script unnecessary.

packaging/ohos/apply-app-icon.sh

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+#!/usr/bin/env bash
+# apply-app-icon.sh — inject Robrix's branded launcher icon into the generated
+# OpenHarmony (HarmonyOS) DevEco project.
+#
+# Why this is needed:
+#   `cargo makepad ohos ... deveco` scaffolds the DevEco project from cargo-makepad's
+#   own template, which ships makepad's placeholder icon and has no hook to use the
+#   project's real icon (unlike the Android path, which reads
+#   [package.metadata.makepad.android].icons in Cargo.toml). It also regenerates the
+#   project under target/ on every run, so the icon cannot simply be committed there.
+#   This script copies Robrix's icons (packaging/ohos/media/) into the freshly
+#   generated project.
+#
+# When to run: AFTER `cargo makepad ohos ... deveco`, BEFORE `... build`.
+#
+#   usage: packaging/ohos/apply-app-icon.sh [deveco_project_dir]
+#          deveco_project_dir defaults to target/makepad-open-harmony/robrix
+set -euo pipefail
+
+HERE="$(cd "$(dirname "$0")" && pwd)"
+MEDIA="$HERE/media"
+PROJ="${1:-target/makepad-open-harmony/robrix}"
+
+[ -d "$PROJ" ] || {
+  echo "error: DevEco project not found at '$PROJ'" >&2
+  echo "       run 'cargo makepad ohos ... deveco -p robrix' first." >&2
+  exit 1
+}
+
+APPSCOPE_MEDIA="$PROJ/AppScope/resources/base/media"
+ENTRY_MEDIA="$PROJ/entry/src/main/resources/base/media"
+[ -d "$APPSCOPE_MEDIA" ] && [ -d "$ENTRY_MEDIA" ] || {
+  echo "error: '$PROJ' does not look like a makepad DevEco project (missing media dirs)" >&2
+  exit 1
+}
+
+# app-level icon (AppScope/app.json5 -> $media:app_icon)
+cp "$MEDIA/app_icon.png"   "$APPSCOPE_MEDIA/app_icon.png"
+# launcher layered icon (media/layered_image.json -> $media:foreground over $media:background)
+cp "$MEDIA/foreground.png" "$ENTRY_MEDIA/foreground.png"
+cp "$MEDIA/background.png" "$ENTRY_MEDIA/background.png"
+# start-window icon (module.json5 EntryAbility -> $media:startIcon)
+cp "$MEDIA/startIcon.png"  "$ENTRY_MEDIA/startIcon.png"
+
+echo "Robrix app icon applied to $PROJ"