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Heltec v3 without display repeater.#2250

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MeetTheTree wants to merge 4 commits intomeshcore-dev:devfrom
MeetTheTree:heltec_v3_without_display_repeater
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Heltec v3 without display repeater.#2250
MeetTheTree wants to merge 4 commits intomeshcore-dev:devfrom
MeetTheTree:heltec_v3_without_display_repeater

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@MeetTheTree MeetTheTree commented Apr 4, 2026

I have two heltec v3 without display or with broken display. When flashing with the default firmware it is not possible to configure the nodes using the browser or webclient, because the nodes are stuck in the boot process. This PR solves the problem by omitting all display related stuff. So that the nodes can start and be configured even if the display is missing or there is a fault during the initialization of the I2C bus.

Added an variant to use the heltec v3 without display as a repeater. This is intended for those whose display is either broken or who want to use the heltec v3 without the display.
Implemented check if for conditional loading of display related libraries. If DISPLAY_CLASS is NULL_DISPLAY_DRIVER omit any display related code elsewise include the display.
added NO_DISPLAY FLAG
simplified logic for inclusion of display code
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