docs(backlog): scope item 33 (rofi scrollbar) as a ~10-file visual slice

Found every authored .rasi deliberately hides the scrollbar (width:0), so
the overflow hint needs per-theme tuning across ~10 files with a V3-only
payoff — recorded so it is picked up in a themed session, not blind.

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

flake.lock

@@ -166,11 +166,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1782562157,
-        "narHash": "sha256-a7+T6QSeowynwZ1ZJJbP8T8ntAytvrui8kFGJmIZt2c=",
+        "lastModified": 1783370751,
+        "narHash": "sha256-E+3MIMvKuo9k+K+qLQ9YXzsBzkgHuyVLnsEbN2DFfuc=",
         "owner": "NixOS",
         "repo": "nixos-hardware",
-        "rev": "a9cf7546a938c737b079e738de73934a13de9784",
+        "rev": "662bd6e312d2c8b212e32cb377abaee190749320",
         "type": "github"
       },
       "original": {
@@ -249,11 +249,11 @@
         "tinted-zed": "tinted-zed"
       },
       "locked": {
-        "lastModified": 1783308448,
-        "narHash": "sha256-n+OcIYCfHofQgsuDJ5w42BNoGDnJwmd7tHqLNpVaJOU=",
+        "lastModified": 1783359251,
+        "narHash": "sha256-HUiCnEVlJ4n+qJlZojiz/zv+P0cqM5zsg1dxpz2J7Mg=",
         "owner": "nix-community",
         "repo": "stylix",
-        "rev": "a5b35360dd2f9a931e85457c3d6d9688307b939f",
+        "rev": "e602ad042f00409f33c8ad2829cd8d59ba345c7e",
         "type": "github"
       },
       "original": {