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/api_test.go

@@ -235,16 +235,25 @@ func TestDeleteEntity_SoftThenHard(t *testing.T) {
 	// Soft delete
 	req, _ := http.NewRequest("DELETE", srv.URL+"/api/entities/"+created.ID, nil)
 	resp, _ := http.DefaultClient.Do(req)
+	var delResp DeleteResponse
+	json.NewDecoder(resp.Body).Decode(&delResp)
 	resp.Body.Close()
-	if resp.StatusCode != http.StatusNoContent {
-		t.Fatalf("soft delete: expected 204, got %d", resp.StatusCode)
+	if resp.StatusCode != http.StatusOK {
+		t.Fatalf("soft delete: expected 200, got %d", resp.StatusCode)
+	}
+	if delResp.Result != "soft" {
+		t.Fatalf("soft delete: expected result 'soft', got %q", delResp.Result)
 	}
 
 	// Hard delete
 	resp, _ = http.DefaultClient.Do(req)
+	json.NewDecoder(resp.Body).Decode(&delResp)
 	resp.Body.Close()
-	if resp.StatusCode != http.StatusNoContent {
-		t.Fatalf("hard delete: expected 204, got %d", resp.StatusCode)
+	if resp.StatusCode != http.StatusOK {
+		t.Fatalf("hard delete: expected 200, got %d", resp.StatusCode)
+	}
+	if delResp.Result != "hard" {
+		t.Fatalf("hard delete: expected result 'hard', got %q", delResp.Result)
 	}
 
 	// Gone