Fix Vim navigation outside main panel

[callmiy]

What changed

Fixes the Vim-style main-panel navigation imported from upstream PR jesseduffield#816.

• Makes gg and G available while a normal non-editable side panel retains focus.
• Extends the gg sequence window from 250 ms to 1 second.
• Keeps G idempotent, so both G and repeated GG land on the final page.
• Clears a pending g sequence when jumping to the bottom.
• Displays gg correctly in options/help and regenerated cheatsheets.
• Rejects negative elapsed-time values in double-press detection.

Root cause

PR jesseduffield#816 registered both keys only for the main view. Container Config is normally viewed while Services or Containers retains focus, so the keys were ignored. Its 250 ms double-press window was also too short for normal human input.

Live validation

Validated the patched binary in a dedicated tmux session against the live accloud-lde Docker environment:

1. Focused Services and opened Container Config without entering Main.
2. Scrolled several pages into a long live container configuration.
3. Pressed g, waited 500 ms, then pressed g; content returned to the first line.
4. Pressed G, waited 500 ms, then pressed G; content landed on and remained at the final page.
5. Confirmed the side-panel footer advertises gg and G.

Automated validation

• bash ./test.sh (race-enabled package suite)
• Linux, Windows, and macOS builds
• go run scripts/cheatsheet/main.go check
• go mod vendor with no diff
• gofmt -s check