Interests dashboard page, Articles interest filter, and interest links (steps 5-7)

Every interest name in the web UI links admins to the Articles page
filtered and sorted by that interest's stored matches; the Interests page
lists weights derived from current ratings and manages categories.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01K9PrjtUS16PAQve8D4bHgc

src/interests.rs

@@ -64,6 +64,14 @@ pub struct Rates {
 
 const INTEREST_COLUMNS: &str = "id, name, category, created_at, categorized_at";
 
+/// Dashboard article search for one interest name.
+pub fn articles_href(name: &str) -> String {
+    format!(
+        "/dashboard/articles?interest={}",
+        crate::web::encode_component(name)
+    )
+}
+
 /// Parse an OPML export for the one-time interests importer.
 pub fn parse_opml(raw: &str) -> Vec<String> {
     let mut seen = BTreeSet::new();