Build CSS with Tailwind 4.3.3 standalone and daisyUI 5.7.47

tools/tailwind.sh downloads the pinned Tailwind binary and daisyUI's .mjs
plugins into the gitignored .tools/tailwind/, checking each against a pinned
sha256, so neither developers nor CI need Node. MSBuild compiles
Styles/app.css into wwwroot/css/app.css (also gitignored) on every build,
skipping the step when no source changed. The output is added to Content before
ResolveProjectStaticWebAssets, so a clean-clone publish still gets its .gz/.br
copies and a service-worker-assets.js entry.

index.html now loads css/app.css, plus ionicons as its own stylesheet. The old
bundle stays in the tree until the markup is migrated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

Styles/app.css

@@ -0,0 +1,11 @@
+/* Entry point compiled by Tailwind CSS standalone (tools/tailwind.sh, TailwindCompile in decePubClient.csproj) into
+   wwwroot/css/app.css. Tailwind scans every file under the project that .gitignore doesn't exclude. */
+@import "tailwindcss" source("../");
+
+@source not "../wwwroot/vendor";
+@source not "../Docs";
+
+@plugin "../.tools/tailwind/daisyui.mjs" {
+	themes: false;
+	logs: false;
+}