Bump version to 0.3.0 for the web dashboard v2 release

The static asset URLs carry ?v=<version> and are cached for a day, so the
redesigned CSS needs a new version to reach browsers that cached 0.2.0.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NHyYupFdBiR4VfoUM7NjSM

Cargo.lock

@@ -884,7 +884,7 @@ dependencies = [
 
 [[package]]
 name = "daily-epub"
-version = "0.2.0"
+version = "0.3.0"
 dependencies = [
  "ammonia",
  "anyhow",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "daily-epub"
-version = "0.2.0"
+version = "0.3.0"
 edition = "2024"
 
 [dependencies]