wails3 task not properly forwarding variables to task call

Description

I want to make some minor modifications to the Taskfiles called and found that variables weren't being passed through properly

Tl;DR
call.Vars is not visible to top-level vars:
e.Taskfile.Vars is visible everywhere
the bug = vars injected too late in the lifecycle

To Reproduce

Step 1

• open one of the Taskfiles relevant to your platform (for example build/darwin/Taskfile.yml)
• add a var such as DEBUG_MODE: '{{default "false" .DEBUG_MODE}}'.
• Replace the contents of the run task with

- |
        if [ "{{.DEBUG_MODE}}" = "true" ]; then
          echo "Running in debug mode"
        else
          echo "Running in normal mode"
        fi

Step 2

• Open the atterpac/refresh config for your project and modify the execution list (comment out tasks unimportant for the test) and add the debug mode property as shown below

  executes:
#    - cmd: wails3 build DEV=true
#      type: blocking
#    - cmd: wails3 task common:dev:frontend
#      type: background
    - cmd: wails3 task run DEBUG_MODE=true
      type: primary

Step 3

Run wails3 dev

Expected behaviour

I would expect to see the message Running in debug mode

Screenshots

No response

Attempted Fixes

No response

System Details

# System 

┌──────────────────────────────────────────────────┐
| Name          | MacOS                            |
| Version       | 26.4.1                           |
| ID            | 25E253                           |
| Branding      | MacOS 26.4.1                     |
| Platform      | darwin                           |
| Architecture  | arm64                            |
| Apple Silicon | true                             |
| CPU           | Apple M4 Pro                     |
| CPU 1         | Apple M4 Pro                     |
| CPU 2         | Apple M4 Pro                     |
| GPU           | 20 cores, Metal Support: Metal 4 |
| Memory        | 64 GB                            |
└──────────────────────────────────────────────────┘

# Build Environment 

┌──────────────────────────────────────────────────────────────────────┐
| Wails CLI      | v3.0.0-dev                                          |
| Go Version     | go1.26.2                                            |
| Revision       | bb4fbf95744fafe5acf84e143a419bfffc2159e6            |
| Modified       | true                                                |
| -buildmode     | exe                                                 |
| -compiler      | gc                                                  |
| CGO_CFLAGS     |                                                     |
| CGO_CPPFLAGS   |                                                     |
| CGO_CXXFLAGS   |                                                     |
| CGO_ENABLED    | 1                                                   |
| CGO_LDFLAGS    |                                                     |
| DefaultGODEBUG | cryptocustomrand=1,tlssecpmlkem=0,urlstrictcolons=0 |
| GOARCH         | arm64                                               |
| GOARM64        | v8.0                                                |
| GOOS           | darwin                                              |
| vcs            | git                                                 |
| vcs.modified   | true                                                |
| vcs.revision   | bb4fbf95744fafe5acf84e143a419bfffc2159e6            |
| vcs.time       | 2026-03-01T03:10:56Z                                |
└──────────────────────────────────────────────────────────────────────┘

Additional context

#5135 has been created to address this issue

Reproduce with build/darwin/Taskfile.yml and the atterpac/refresh configuration, then run wails3 dev and trace how the run task receives DEBUG_MODE=true. Compare call.Vars with e.Taskfile.Vars during task evaluation; done when the task prints the expected debug-mode message and the behavior is covered by an appropriate test.