app: on startup, land on main() (else pop the symbol picker)

Instead of staring at an empty pane after the function list loads, jump
somewhere useful: once the index is complete and nothing's open yet, open
main() (tries main/_main/wmain/WinMain/wWinMain in order); if there's no entry
function, pop the fuzzy symbol picker so you can pick one. Fires exactly once
(guarded by _cur + _did_auto_land) and never steals focus from a user who
already navigated during load.

Tests: new auto_land scenario covers both branches (jump-to-main when present,
picker fallback otherwise) + the idempotency guard. Boot/startup now key "load
complete" off _func_index.complete instead of the status string (auto-land
legitimately overwrites the "N functions" status with the landed fn). Full
suite 120 pass / 1 pre-existing flaky (filter).

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