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/object/tests/round_trip/tls.rs

@@ -0,0 +1,308 @@
+#![cfg(all(feature = "read", feature = "write"))]
+
+use object::read::{Object, ObjectSection, ObjectSymbol};
+use object::{read, write};
+use object::{
+    Architecture, BinaryFormat, Endianness, RelocationEncoding, RelocationKind, SectionKind,
+    SymbolFlags, SymbolKind, SymbolScope,
+};
+
+#[test]
+fn coff_x86_64_tls() {
+    let mut object =
+        write::Object::new(BinaryFormat::Coff, Architecture::X86_64, Endianness::Little);
+
+    let section = object.section_id(write::StandardSection::Tls);
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"tls1".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Tls,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    });
+    object.add_symbol_data(symbol, section, &[1; 30], 4);
+
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"tls.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Coff);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let mut sections = object.sections();
+
+    let section = sections.next().unwrap();
+    println!("{:?}", section);
+    let tls_index = section.index();
+    assert_eq!(section.name(), Ok(".tls$"));
+    assert_eq!(section.kind(), SectionKind::Data);
+    assert_eq!(section.size(), 30);
+    assert_eq!(section.data().unwrap(), &[1; 30]);
+
+    let mut symbols = object.symbols();
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("tls1"));
+    assert_eq!(symbol.kind(), SymbolKind::Data);
+    assert_eq!(symbol.section_index(), Some(tls_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert!(!symbol.is_weak());
+    assert!(!symbol.is_undefined());
+}
+
+#[test]
+fn elf_x86_64_tls() {
+    let mut object =
+        write::Object::new(BinaryFormat::Elf, Architecture::X86_64, Endianness::Little);
+
+    let section = object.section_id(write::StandardSection::Tls);
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"tls1".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Tls,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    });
+    object.add_symbol_data(symbol, section, &[1; 30], 4);
+
+    let section = object.section_id(write::StandardSection::UninitializedTls);
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"tls2".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Tls,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    });
+    object.add_symbol_bss(symbol, section, 31, 4);
+
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"tls.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Elf);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let mut sections = object.sections();
+
+    let section = sections.next().unwrap();
+    println!("{:?}", section);
+    let tdata_index = section.index();
+    assert_eq!(section.name(), Ok(".tdata"));
+    assert_eq!(section.kind(), SectionKind::Tls);
+    assert_eq!(section.size(), 30);
+    assert_eq!(section.data().unwrap(), &[1; 30]);
+
+    let section = sections.next().unwrap();
+    println!("{:?}", section);
+    let tbss_index = section.index();
+    assert_eq!(section.name(), Ok(".tbss"));
+    assert_eq!(section.kind(), SectionKind::UninitializedTls);
+    assert_eq!(section.size(), 31);
+    assert_eq!(section.data().unwrap(), &[]);
+
+    let mut symbols = object.symbols();
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("tls1"));
+    assert_eq!(symbol.kind(), SymbolKind::Tls);
+    assert_eq!(symbol.section_index(), Some(tdata_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert!(!symbol.is_weak());
+    assert!(!symbol.is_undefined());
+    assert_eq!(symbol.size(), 30);
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("tls2"));
+    assert_eq!(symbol.kind(), SymbolKind::Tls);
+    assert_eq!(symbol.section_index(), Some(tbss_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert!(!symbol.is_weak());
+    assert!(!symbol.is_undefined());
+    assert_eq!(symbol.size(), 31);
+}
+
+#[test]
+fn macho_x86_64_tls() {
+    let mut object = write::Object::new(
+        BinaryFormat::MachO,
+        Architecture::X86_64,
+        Endianness::Little,
+    );
+
+    let section = object.section_id(write::StandardSection::Tls);
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"tls1".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Tls,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    });
+    object.add_symbol_data(symbol, section, &[1; 30], 4);
+
+    let section = object.section_id(write::StandardSection::UninitializedTls);
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"tls2".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Tls,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    });
+    object.add_symbol_bss(symbol, section, 31, 4);
+
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"tls.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::MachO);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let mut sections = object.sections();
+
+    let thread_data = sections.next().unwrap();
+    println!("{:?}", thread_data);
+    let thread_data_index = thread_data.index();
+    assert_eq!(thread_data.name(), Ok("__thread_data"));
+    assert_eq!(thread_data.segment_name(), Ok(Some("__DATA")));
+    assert_eq!(thread_data.kind(), SectionKind::Tls);
+    assert_eq!(thread_data.size(), 30);
+    assert_eq!(thread_data.data().unwrap(), &[1; 30]);
+
+    let thread_vars = sections.next().unwrap();
+    println!("{:?}", thread_vars);
+    let thread_vars_index = thread_vars.index();
+    assert_eq!(thread_vars.name(), Ok("__thread_vars"));
+    assert_eq!(thread_vars.segment_name(), Ok(Some("__DATA")));
+    assert_eq!(thread_vars.kind(), SectionKind::TlsVariables);
+    assert_eq!(thread_vars.size(), 2 * 3 * 8);
+    assert_eq!(thread_vars.data().unwrap(), &[0; 48]);
+
+    let thread_bss = sections.next().unwrap();
+    println!("{:?}", thread_bss);
+    let thread_bss_index = thread_bss.index();
+    assert_eq!(thread_bss.name(), Ok("__thread_bss"));
+    assert_eq!(thread_bss.segment_name(), Ok(Some("__DATA")));
+    assert_eq!(thread_bss.kind(), SectionKind::UninitializedTls);
+    assert_eq!(thread_bss.size(), 31);
+    assert_eq!(thread_bss.data(), Ok(&[][..]));
+
+    let mut symbols = object.symbols();
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    let tls1_init_symbol = symbol.index();
+    assert_eq!(symbol.name(), Ok("_tls1$tlv$init"));
+    assert_eq!(symbol.kind(), SymbolKind::Tls);
+    assert_eq!(symbol.section_index(), Some(thread_data_index));
+    assert_eq!(symbol.scope(), SymbolScope::Compilation);
+    assert!(!symbol.is_weak());
+    assert!(!symbol.is_undefined());
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    let tls2_init_symbol = symbol.index();
+    assert_eq!(symbol.name(), Ok("_tls2$tlv$init"));
+    assert_eq!(symbol.kind(), SymbolKind::Tls);
+    assert_eq!(symbol.section_index(), Some(thread_bss_index));
+    assert_eq!(symbol.scope(), SymbolScope::Compilation);
+    assert!(!symbol.is_weak());
+    assert!(!symbol.is_undefined());
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("_tls1"));
+    assert_eq!(symbol.kind(), SymbolKind::Tls);
+    assert_eq!(symbol.section_index(), Some(thread_vars_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert!(!symbol.is_weak());
+    assert!(!symbol.is_undefined());
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("_tls2"));
+    assert_eq!(symbol.kind(), SymbolKind::Tls);
+    assert_eq!(symbol.section_index(), Some(thread_vars_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert!(!symbol.is_weak());
+    assert!(!symbol.is_undefined());
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    let tlv_bootstrap_symbol = symbol.index();
+    assert_eq!(symbol.name(), Ok("__tlv_bootstrap"));
+    assert_eq!(symbol.kind(), SymbolKind::Unknown);
+    assert_eq!(symbol.section_index(), None);
+    assert_eq!(symbol.scope(), SymbolScope::Unknown);
+    assert!(!symbol.is_weak());
+    assert!(symbol.is_undefined());
+
+    let mut relocations = thread_vars.relocations();
+
+    let (offset, relocation) = relocations.next().unwrap();
+    println!("{:?}", relocation);
+    assert_eq!(offset, 40);
+    assert_eq!(relocation.kind(), RelocationKind::Absolute);
+    assert_eq!(relocation.encoding(), RelocationEncoding::Generic);
+    assert_eq!(relocation.size(), 64);
+    assert_eq!(
+        relocation.target(),
+        read::RelocationTarget::Symbol(tls2_init_symbol)
+    );
+    assert_eq!(relocation.addend(), 0);
+
+    let (offset, relocation) = relocations.next().unwrap();
+    println!("{:?}", relocation);
+    assert_eq!(offset, 24);
+    assert_eq!(relocation.kind(), RelocationKind::Absolute);
+    assert_eq!(relocation.encoding(), RelocationEncoding::Generic);
+    assert_eq!(relocation.size(), 64);
+    assert_eq!(
+        relocation.target(),
+        read::RelocationTarget::Symbol(tlv_bootstrap_symbol)
+    );
+    assert_eq!(relocation.addend(), 0);
+
+    let (offset, relocation) = relocations.next().unwrap();
+    println!("{:?}", relocation);
+    assert_eq!(offset, 16);
+    assert_eq!(relocation.kind(), RelocationKind::Absolute);
+    assert_eq!(relocation.encoding(), RelocationEncoding::Generic);
+    assert_eq!(relocation.size(), 64);
+    assert_eq!(
+        relocation.target(),
+        read::RelocationTarget::Symbol(tls1_init_symbol)
+    );
+    assert_eq!(relocation.addend(), 0);
+
+    let (offset, relocation) = relocations.next().unwrap();
+    println!("{:?}", relocation);
+    assert_eq!(offset, 0);
+    assert_eq!(relocation.kind(), RelocationKind::Absolute);
+    assert_eq!(relocation.encoding(), RelocationEncoding::Generic);
+    assert_eq!(relocation.size(), 64);
+    assert_eq!(
+        relocation.target(),
+        read::RelocationTarget::Symbol(tlv_bootstrap_symbol)
+    );
+    assert_eq!(relocation.addend(), 0);
+}