TFT: presets render only in the upper half of the panel

[wsclx]

Symptom

Reported by @wsclx in Phase 5c testing:

"Die allermeisten finden nur in der oberen Hälfte des gesamten Displays statt."

Partially mitigated in 382d59c (the 0x0650 chunk-header fix). Mario reports some animations now span the full screen — but #1 (horizontal noise lines) is the symptom that replaced the upper-half clip for those presets. Other presets may still show the original clip.

What we know

• Dimensions are confirmed 128 × 128 from the AJAZZ web driver (AK820 → 128 × 128).
• The chunk-header magic was wrong (0x064F instead of 0x0650) until the fix. That moved the needle but didn't fully resolve.
• Static presets (e.g. solid-magenta, solid-cyan) are the right diagnostic — if a solid colour still shows a clip line, dimensions/stride is the bug; if not, it's preset-specific.

What's needed to triage

• Phone photo of the Diagnostic · Quadrants preset on Mario's hardware. Tells us:
  • Are all 4 quadrants visible? → dimensions are fine
  • Are the centre cross and 16 px grid intact? → row stride is fine
  • Is the bottom-right quadrant missing? → byte-order or pagination issue
• Which presets still show the clip vs which now render full-screen.

Related

• Chunk-header fix: 382d59c
• TftMemory preservation fix: 86a3612 (unrelated but landed after this issue surfaced)