Miscellaneous fixes (#23032)

* ensure embeddings process restarts after maintainer thread crash

* add docs link to media sync settings

* fix color

Co-authored-by: Copilot <copilot@github.com>

* match link color with other sections

* ensure recording staleness threshold scales with segment_time

* docs tweak

* Fix llama.cpp media marker

* Fix gemini tools call

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Co-authored-by: Copilot <copilot@github.com>
Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>