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We extract checkEditPrefsAccessLocked, adjustEditPrefsLocked, and onEditPrefsLocked from the EditPrefs execution path, defining when each step is performed and what behavior is allowed at each stage. Currently, this is primarily used to support Always On mode, to handle the Exit Node enablement toggle, and to report prefs edit metrics. We then use it to enforce Exit Node policy settings by preventing users from setting an exit node and making EditPrefs return an error when an exit node is restricted by policy. This enforcement is also extended to the Exit Node toggle. These changes prepare for supporting Exit Node overrides when permitted by policy and preventing logout while Always On mode is enabled. In the future, implementation of these methods can be delegated to ipnext extensions via the feature hooks. Updates tailscale/corp#29969 Updates tailscale/corp#26249 Signed-off-by: Nick Khyl <nickk@tailscale.com>