Native Planner form transport

Replaces the Planner JSON request body with a PHP-native URL-encoded POST for reliable shared-hosting parsing
Builds every save body directly from the current editable map geometry instead of trusting hidden form fields
Blocks native form navigation before route regeneration or synchronization begins
Sends the visible survey-corner count separately so PHP can identify transport loss precisely
Keeps the browser draft until the server has stored and read back the complete mission successfully
Preserves the direct JSON parser for compatibility with Beta 0.35 browser sessions
Verifies four-corner save, reload, corner move, and resave using the production request format
Gives all System update panels the same responsive width and height without changing updater behavior
Universal install/update package supports Betas 0.15 through 0.35