feat(dashboard): add sidebar with Ollama status, trending topics, and article detail panel

Integrate SearXNG news search, Ollama-powered article summarization with
follow-up chat, and a dashboard sidebar showing LLM status, trending
keywords, and recent search history. Sidebar yields to a split-view
article detail panel when a card is selected.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Cargo.toml

@@ -75,6 +75,7 @@ dioxus-free-icons = { version = "0.10", features = [
 ] }
 sha2 = { version = "0.10.9", default-features = false, optional = true }
 base64 = { version = "0.22.1", default-features = false, optional = true }
+scraper = { version = "0.22", default-features = false, optional = true }
 
 [features]
 # default = ["web"]
@@ -91,6 +92,7 @@ server = [
     "dep:url",
     "dep:sha2",
     "dep:base64",
+    "dep:scraper",
 ]
 
 [[bin]]