Slice 13: repo search + filtering (+ no-cache dev assets)

<repo-list> gains a search box (name/path) and Dirty/Ahead-behind filter chips with an N-of-M count; filtering is client-side and the state persists in localStorage (gitmanager.repolist.filters, §4). Refresh/selection re-apply filters. cmd/server sends Cache-Control: no-cache for /components and /static so hot-reloaded asset edits show on reload. Server-verified (curl); live click-through pending an unresponsive browser pane.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

cmd/server/main.go

@@ -10,6 +10,7 @@ import (
 	"net/http"
 	"os"
 	"os/signal"
+	"strings"
 	"syscall"
 	"time"
 
@@ -109,6 +110,18 @@ func main() {
 	e.Use(middleware.Recover())
 	e.Use(middleware.RequestID())
 
+	// Ask browsers to revalidate component/static assets so edits show up on
+	// reload (the dev server hot-reloads; cached ES modules would defeat that).
+	e.Use(func(next echo.HandlerFunc) echo.HandlerFunc {
+		return func(c echo.Context) error {
+			p := c.Request().URL.Path
+			if strings.HasPrefix(p, "/components/") || strings.HasPrefix(p, "/static/") {
+				c.Response().Header().Set("Cache-Control", "no-cache")
+			}
+			return next(c)
+		}
+	})
+
 	// Static assets and component sources.
 	e.Static("/static", "web/static")
 	e.Static("/components", "components")