AP mode starts an invisible SSID/password form

[AuthenticSm1les]

When Impala is in AP mode, pressing n activates the access point input flow, but the SSID/password popup is not rendered.

Symptoms:

• n appears to do nothing visually
• typing still fills the hidden fields
• Tab and Enter still work, so an AP can be started blindly

There is a second issue in the same flow:

• AP mode advertises n New AP and x Stop AP
• the AP event handler was not processing those keybindings in the FocusedBlock::AccessPoint branch

Root cause:

• the handler switches focus to FocusedBlock::AccessPointInput
• ui.rs never renders the AP input popup for that focused block
• the AP-mode handler also skipped the configured start/stop keys in the AP pane

Fix:

• handle config.ap.start / config.ap.stop in AP mode
• render the AP input popup when FocusedBlock::AccessPointInput is active

Validation:

• cargo build
• launch patched binary in AP mode
• press n
• popup becomes visible
• enter SSID/passphrase and start AP successfully