taffybar: point library input to anthropic-oauth-utilization PR branch

Pins taffybar to github:taffybar/taffybar/anthropic-oauth-utilization
(commit 6e2a1275) so the Anthropic usage widget reads OAuth utilization
percentages instead of raw token counts. Revert to master after the PR
merges.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

dotfiles/config/taffybar/flake.lock

@@ -136,15 +136,16 @@
         "xmonad-contrib": "xmonad-contrib"
       },
       "locked": {
-        "lastModified": 1780528245,
-        "narHash": "sha256-1whI87DIe3+KdQkQSl3IwpqXiVn3BEVEG2EtgkmNlN0=",
+        "lastModified": 1781156858,
+        "narHash": "sha256-w5drkb9QGCQMphSyyh1SplfH74hMib+eZ74rra/8yQk=",
         "owner": "taffybar",
         "repo": "taffybar",
-        "rev": "31578b0770b061c9a63109739776b7291de1ae9b",
+        "rev": "6e2a12758a7c700d029ba7de777bbd3920dfca90",
         "type": "github"
       },
       "original": {
         "owner": "taffybar",
+        "ref": "anthropic-oauth-utilization",
         "repo": "taffybar",
         "type": "github"
       }

dotfiles/config/taffybar/flake.nix

@@ -3,7 +3,7 @@
     taffybar = {
       # Keep the default source usable in CI. Local iteration uses
       # IMALISON_TAFFYBAR_LIVE_CHECKOUT below via `just switch-local-taffybar`.
-      url = "github:taffybar/taffybar";
+      url = "github:taffybar/taffybar/anthropic-oauth-utilization";
       inputs.weeder-nix = {
         url = "github:NorfairKing/weeder-nix";
         inputs.pre-commit-hooks.inputs.nixpkgs.follows = "nixpkgs";