[6.x] Permissions Check/Uncheck All buttons

[jackmcdade]

Note

Low Risk
UI-only changes that mutate in-memory permission checked flags; main risk is incorrect bulk selection state propagation in nested permission trees.

Overview
Adds Check/Uncheck All controls to the role publish form: a global toggle next to Save and per-permission-group toggles in each group header, with recursive logic to compute “all checked” and apply bulk selection across nested permissions.

Updates PermissionTree.vue to watch initialPermissions and keep its local permissions state in sync when parents mutate the permission structure. Adds new checkbox and checkbox-uncheck SVG icons used by the new buttons.

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