Stage 8g — Shared Status Icons and Explicit Audio Off State

Why this stage exists

The original bar volume glyph used zero active level bars for 0%. That looked like a weak or incomplete meter rather than clearly communicating that audio was fully off. Battery, volume, wired, and cellular drawing also still belonged to the demo bar after Wi-Fi had moved to the shared icon crate. A composition should arrange icons, not own their drawing implementations.

State and rendering

patin-icons::VolumeLevel represents off, low, medium, and high independently of the service provider. VolumeLevel::from_percentage selects off whenever the reported percentage is zero or the sink is muted. The off glyph retains the speaker body and places a small foreground-colored vector cross beside it; low volume retains one active level bar, so the two states cannot be confused.

The demo bar converts its existing VolumeSnapshot into this semantic state and supplies the same palette used for shared Wi-Fi icons. Battery, cellular, and wired glyphs now use the same crate and palette. Service adapters continue to own only status data, while the reusable icon crate owns every status-glyph representation. The bar retains only layout, hit targets, status-to-icon state mapping, and its palette.

Changed files and important functions

• crates/patin-icons/src/lib.rs: VolumeLevel::from_percentage maps service values; volume draws the speaker, level bars, and off cross; cross is the shared vector helper also used by unavailable Wi-Fi. battery, cellular_signal, and wired contain the remaining status drawings.
• examples/demo_bar/scene.rs: DemoBar::commands consumes every shared status icon; all former bar-local icon and shape helpers are removed.
• README, architecture, Stage 6d, and docs/SUMMARY.md record the shared ownership and off-state behavior.

Verification

Local verification on 2026-08-10:

cargo fmt --all -- --check
  no output
cargo check --workspace --all-targets
  finished successfully
cargo test --workspace --all-targets
  56 passed; 0 failed
cargo clippy --workspace --all-targets --all-features -- -D warnings
  finished successfully
mdbook build
  HTML book written to book/
git diff --check
  no output

The FP5 native release build compiled both consumers with the phone’s existing project-local xkbcommon metadata:

PKG_CONFIG_PATH=~/proj/0xin/.sysroot/usr/lib/pkgconfig \
  cargo build --release --locked --example demo_bar
  finished successfully
PKG_CONFIG_PATH=~/proj/0xin/.sysroot/usr/lib/pkgconfig \
  cargo build --release --locked -p patin-network-settings
  finished successfully

The demo bar was installed as ~/.local/bin/patin and network settings as ~/.local/bin/patin-network-settings. Both installed SHA-256 values matched their native release artifacts. The running bar was not killed remotely; it will load the shared status-icon build on its next normal restart.