fix: batch tag queries, inline edit, delete response, SPA catch-all, link glyph

- Fix N+1 tag query in List() with batched IN clause
- Add inline body editing in web detail pane (dblclick or e key)
- Delete API returns {result: "soft"|"hard"} with 200 instead of 204
- SPA handler serves index.html for all extensionless paths
- Link glyph changed from emoji 🔗 to unicode ↗ for terminal alignment
- Capture bar contrast and hover glow increased
- Comment on load-bearing "--" in root.go

internal/api/router.go

@@ -3,6 +3,7 @@ package api
 import (
 	"io/fs"
 	"net/http"
+	"path"
 
 	"github.com/go-chi/chi/v5"
 	"github.com/go-chi/chi/v5/middleware"
@@ -45,8 +46,8 @@ func spaHandler(fsys fs.FS) http.HandlerFunc {
 	indexHTML, _ := fs.ReadFile(fsys, "index.html")
 
 	return func(w http.ResponseWriter, r *http.Request) {
-		path := r.URL.Path
-		if path == "/" || path == "/cards" {
+		p := r.URL.Path
+		if p == "/" || path.Ext(p) == "" {
 			w.Header().Set("Content-Type", "text/html; charset=utf-8")
 			w.Write(indexHTML)
 			return