feat: add display UI with splash screen, dashboard, and RSSI sparkline

Implement full SSD1306 OLED display support:
- Splash screen on boot (1.5s) with project name, version, board
- Dashboard showing radio state, config, counters, RSSI/SNR
- RSSI history sparkline (64-sample ring buffer, 2px-wide bars)
- DisplayOn/DisplayOff host commands routed via dedicated channel
- Pure render functions against generic DrawTarget (no hardware coupling)
- Display on/off control bypasses radio task entirely

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

vendor/fixed/etc/appveyor.yml

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+# Copyright © 2018–2025 Trevor Spiteri
+
+# Copying and distribution of this file, with or without modification,
+# are permitted in any medium without royalty provided the copyright
+# notice and this notice are preserved. This file is offered as-is,
+# without any warranty.
+
+skip_tags: true
+
+branches:
+  except:
+    - www
+
+environment:
+  MSRV: 1.83.0
+  matrix:
+    - TARGET: x86_64-pc-windows-msvc
+    - TARGET: x86_64-pc-windows-gnu
+    - TARGET: i686-pc-windows-msvc
+
+cache:
+  - '%USERPROFILE%\.cargo\registry\cache'
+
+install:
+  - set PATH=C:\msys64\usr\bin;%USERPROFILE%\.cargo\bin;%PATH%
+  - curl -sSf -o rustup-init.exe https://win.rustup.rs
+  - rustup-init.exe -y --default-host %TARGET% --default-toolchain none --no-modify-path
+  - rustup --version
+  - rustup toolchain install --profile minimal beta-%TARGET% %MSRV%-%TARGET%
+  - rustup component add --toolchain beta-%TARGET% clippy
+
+build: false
+
+before_test:
+  - bash -c "if [ -d $USERPROFILE/.cargo/registry/src ]; then rm -r $USERPROFILE/.cargo/src; fi"
+  - bash -c "if [ -d $USERPROFILE/.cargo/registry/cache ]; then cd $USERPROFILE/.cargo/registry; find cache -name \*.crate | sort; fi"
+
+test_script:
+  - cargo +beta-%TARGET% clippy --all-targets --features "fail-on-warnings arbitrary borsh num-traits serde std"
+  - cargo +beta-%TARGET% test --release --features "fail-on-warnings arbitrary borsh num-traits serde std"
+  - cargo +%MSRV%-%TARGET% test --lib --features "fail-on-warnings num-traits std"
+
+after_test:
+  # ugh, appveyor can't handle percentage signs, so we need to use $(sed 's/\.crate$//' <<< $s)
+  - bash -c "if [ -d $USERPROFILE/.cargo/registry/cache ]; then cd $USERPROFILE/.cargo/registry; for c in cache/*/*.crate; do s=src/${c#cache/}; if [ ! -e $(sed 's/\.crate$//' <<< $s) ]; then rm -v $c; fi; done; find cache -name \*.crate | sort; fi"

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+PC9zdmc+Cg==

vendor/fixed/etc/gitlab-ci.yml

@@ -0,0 +1,142 @@
+# Copyright © 2018–2025 Trevor Spiteri
+
+# Copying and distribution of this file, with or without modification,
+# are permitted in any medium without royalty provided the copyright
+# notice and this notice are preserved. This file is offered as-is,
+# without any warranty.
+
+variables:
+  MSRV: 1.83.0
+
+before_script:
+  - getconf LONG_BIT
+  - rustup self update
+  - rustup --version
+  - if [ -d cargo/registry/cache ]; then rm -rf $CARGO_HOME/registry/cache; mkdir -p $CARGO_HOME/registry; cp -R cargo/registry/cache $CARGO_HOME/registry/; echo Copied registry/cache; fi
+  - if [ -d $CARGO_HOME/registry/src ]; then rm -r $CARGO_HOME/registry/src; fi
+  - if [ -d $CARGO_HOME/registry/cache ]; then (cd $CARGO_HOME/registry; find cache -name \*.crate | sort) fi
+
+after_script:
+  - if [ -d $CARGO_HOME/registry/cache ]; then (cd $CARGO_HOME/registry; for c in cache/*/*.crate; do s=src/${c#cache/}; if [ ! -e ${s%.crate} ]; then rm -v $c; fi; done; find cache -name \*.crate | sort) fi
+  - rm -rf cargo
+  - mkdir -p cargo/registry
+  - if [ -d $CARGO_HOME/registry/cache ]; then cp -R $CARGO_HOME/registry/cache cargo/registry/; echo Updated registry/cache; fi
+
+x86_64-gnulinux:
+  image: amd64/rust:1
+  variables:
+    TARGET: x86_64
+  cache:
+    key: $CI_JOB_NAME
+    paths:
+    - cargo/
+  script:
+  - rustup toolchain install --profile minimal beta-$TARGET $MSRV-$TARGET nightly-$TARGET
+  - cargo +beta-$TARGET test --features "fail-on-warnings arbitrary borsh num-traits serde std"
+  - cargo +beta-$TARGET test --release --features "fail-on-warnings arbitrary borsh num-traits serde std"
+  - cargo +$MSRV-$TARGET test --lib --features "fail-on-warnings num-traits std"
+  - cargo +$MSRV-$TARGET test --release --lib --features "fail-on-warnings num-traits std"
+  - cargo +nightly-$TARGET test --features "fail-on-warnings nightly-float"
+  only:
+  - ci
+
+i686-gnulinux:
+  image: i386/rust:1
+  variables:
+    TARGET: i686
+  cache:
+    key: $CI_JOB_NAME
+    paths:
+    - cargo/
+  script:
+  - rustup toolchain install --profile minimal beta-$TARGET $MSRV-$TARGET nightly-$TARGET
+  - cargo +beta-$TARGET test --features "fail-on-warnings arbitrary borsh num-traits serde std"
+  - cargo +beta-$TARGET test --release --features "fail-on-warnings arbitrary borsh num-traits serde std"
+  - cargo +$MSRV-$TARGET test --lib --features "fail-on-warnings num-traits std"
+  - cargo +$MSRV-$TARGET test --release --lib --features "fail-on-warnings num-traits std"
+  - cargo +nightly-$TARGET test --features "fail-on-warnings nightly-float"
+  only:
+  - ci
+
+x86_64-gnulinux-tidy:
+  image: amd64/rust:1
+  variables:
+    TARGET: x86_64
+  cache:
+    key: $CI_JOB_NAME
+    paths:
+    - cargo/
+  script:
+  - rustup toolchain install --profile minimal beta-$TARGET
+  - rustup component add --toolchain beta-$TARGET rustfmt clippy
+  - cargo +beta-$TARGET fmt -- --check
+  - cargo +beta-$TARGET clippy --all-targets --features "fail-on-warnings arbitrary borsh num-traits serde std"
+  - cargo +beta-$TARGET clippy --all-targets --features "fail-on-warnings arbitrary"
+  - cargo +beta-$TARGET clippy --all-targets --features "fail-on-warnings num-traits"
+  - cargo +beta-$TARGET clippy --all-targets --features "fail-on-warnings borsh"
+  - cargo +beta-$TARGET clippy --all-targets --features "fail-on-warnings serde"
+  - cargo +beta-$TARGET clippy --all-targets --features "fail-on-warnings serde-str"
+  - cargo +beta-$TARGET clippy --all-targets --features "fail-on-warnings std"
+  - cargo +beta-$TARGET clippy --all-targets --features fail-on-warnings
+  only:
+  - ci
+
+i686-gnulinux-tidy:
+  image: i386/rust:1
+  variables:
+    TARGET: i686
+  cache:
+    key: $CI_JOB_NAME
+    paths:
+    - cargo/
+  script:
+  - rustup toolchain install --profile minimal beta-$TARGET
+  - rustup component add --toolchain beta-$TARGET rustfmt clippy
+  - cargo +beta-$TARGET fmt -- --check
+  - cargo +beta-$TARGET clippy --all-targets --features "fail-on-warnings arbitrary borsh num-traits serde std"
+  - cargo +beta-$TARGET clippy --all-targets --features "fail-on-warnings arbitrary"
+  - cargo +beta-$TARGET clippy --all-targets --features "fail-on-warnings num-traits"
+  - cargo +beta-$TARGET clippy --all-targets --features "fail-on-warnings borsh"
+  - cargo +beta-$TARGET clippy --all-targets --features "fail-on-warnings serde"
+  - cargo +beta-$TARGET clippy --all-targets --features "fail-on-warnings serde-str"
+  - cargo +beta-$TARGET clippy --all-targets --features "fail-on-warnings std"
+  - cargo +beta-$TARGET clippy --all-targets --features fail-on-warnings
+  only:
+  - ci
+
+x86_64-gnulinux-tarpaulin:
+  image: amd64/rust:1
+  variables:
+    TARGET: x86_64
+    REQ_COVERAGE: "70"
+  cache:
+    key: $CI_JOB_NAME
+    paths:
+    - cargo/
+  script:
+  - rustup toolchain install --profile minimal beta-$TARGET
+  - cargo +beta-$TARGET install --version 0.32.0 --locked cargo-tarpaulin
+  - cargo +beta-$TARGET tarpaulin --verbose --ignore-tests --fail-under $REQ_COVERAGE --exclude-files build.rs --features "arbitrary borsh num-traits serde std"
+  only:
+  - ci
+
+pages:
+  image: amd64/rust:1
+  variables:
+    TARGET: x86_64
+  cache:
+    key: $CI_JOB_NAME
+    paths:
+    - cargo/
+  script:
+  - rustup toolchain install --profile minimal nightly-$TARGET
+  - rm -rf public
+  - mkdir public
+  - cp etc/index.html public
+  - cargo +nightly-$TARGET doc --no-deps --features "arbitrary borsh num-traits serde std" -Z rustdoc-map
+  - mv target/doc public/dev
+  artifacts:
+    paths:
+    - public
+  only:
+  - www

vendor/fixed/etc/index.html

@@ -0,0 +1,17 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <title>Fixed-point numbers</title>
+  </head>
+  <body>
+    <div style="margin-right: auto; margin-left: auto; max-width: 600px;">
+      <h1>Fixed-point numbers</h1>
+      <p>The <a href="https://crates.io/crates/fixed"><i>fixed</i> crate</a> provides fixed-point numbers. Here you can find the documentation for the <a href="https://gitlab.com/tspiteri/fixed">current development version</a> of the crate.</p>
+      <h2>Documentation</h2>
+      <ul>
+	<li><a href="dev/fixed/index.html">Documentation for the current development version.</a></li>
+	<li><a href="https://docs.rs/fixed">Documentation for the published versions.</a></li>
+      </ul>
+    </div>
+  </body>
+</html>