Various build size optimizations

firmware/Cargo.toml

@@ -10,7 +10,6 @@ cortex-m = { version = "0.7.7", features = [
   "critical-section-single-core",
 ] }
 cortex-m-rt = "0.7.5"
-critical-section = "1.2.0"
 defmt = "1.0.1"
 defmt-rtt = "1.1.0"
 embassy-executor = { version = "0.9.1", features = [
@@ -38,6 +37,7 @@ embassy-usb = { version = "0.5.1", features = ["defmt"] }
 embedded-graphics = { version = "0.8.1", features = ["defmt"] }
 embedded-hal-bus = { version = "0.3.0", features = ["async"] }
 epd-waveshare = "0.6.0"
+panic-abort = "0.3.2"
 panic-probe = { version = "1.0.0", features = ["print-defmt"] }
 postcard = { version = "1.1.3", features = ["defmt"] }
 serde = { version = "1.0.228", default-features = false, features = ["derive"] }
@@ -45,6 +45,8 @@ static_cell = "2.1.1"
 
 [profile.dev]
 opt-level = "s"
+lto = "fat"
 
 [profile.release]
-opt-level = "s"
+opt-level = "z"
+lto = "fat"