refactor: extract theme toggle styles to CSS and improve timeout handling

Cargo.lock

@@ -238,7 +238,6 @@ dependencies = [
  "http 1.3.1",
  "mime_guess",
  "num-format",
- "once_cell",
  "poise",
  "rand 0.9.2",
  "rapidhash",
@@ -1284,12 +1283,6 @@ dependencies = [
  "pin-project-lite",
 ]
 
-[[package]]
-name = "http-range-header"
-version = "0.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9171a2ea8a68358193d15dd5d70c1c10a2afc3e7e4c5bc92bc9f025cebd7359c"
-
 [[package]]
 name = "httparse"
 version = "1.10.1"
@@ -3544,20 +3537,12 @@ checksum = "adc82fd73de2a9722ac5da747f12383d2bfdb93591ee6c58486e0097890f05f2"
 dependencies = [
  "bitflags 2.9.4",
  "bytes",
- "futures-core",
  "futures-util",
  "http 1.3.1",
  "http-body 1.0.1",
- "http-body-util",
- "http-range-header",
- "httpdate",
  "iri-string",
- "mime",
- "mime_guess",
- "percent-encoding",
  "pin-project-lite",
  "tokio",
- "tokio-util",
  "tower",
  "tower-layer",
  "tower-service",