touch: wake on boot — FT5426 only reports while LCD is streaming + lit

Symptom: after a few cleanup cycles + power cycles, fresh boots left
touch dead — the FT5426 ack'd, polling read TD_STATUS=0x00 cleanly,
but taps never registered. Curl-waking the screen made touch work
again instantly; tapping the dark backlight-off panel did nothing.

Root cause: on this panel the FT5426 firmware only reports contact
points while the DSI link is actively streaming with the backlight on.
Booting straight into ASLEEP per the spec leaves taps silently unread,
and there's no built-in way to wake without touch (no hardware button
on this board — see prior commit). The fix is to wake on boot; the
idle timer cuts back to sleep after idle_timeout_ms if nothing happens.

Also defensively write DEV_MODE=0x00 (Working Mode) at touch_init,
and add a runtime self-heal: if the polling loop sees stuck TD_STATUS
above the 5-touch ceiling for ~3 s, pulse PC_RST_TP_N via the panel
MCU and retry. Combined with display_touch_reset_pulse() the chip
recovers from cold-boot wedges without manual intervention.

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