Compass improvements/refactoring

[HarukiToreda]

Summary
This PR improves compass behavior and reliability across BaseUI compasses. Address this PR #9928

Changes

• Fixes issue with calibration looping forever and never completing.
• Compass calibration is now saved and loaded automatically, so it survives reboot.
• Calibration screen now gives more detailed instructions on how to perform calibration.
• Fixes issue with calibration looping forever and never completing.
• Increased redraw fps to 20 to make heading movement smoth on live data from compass.
• Compass calibration flow was cleaned up and shared across supported sensors.
• Compass heading updates are smoother and less jumpy.
• Compass heading is more user friendly:
  -- "no heading" is shown right after first lock until there is enough movement(2 gps cords)
  -- GPS-based heading only appears after real movement (~10m/30ft), not immediately at first lock.
  -- heading clears after staying still for a while, based on GPS/smart position timing
  -- Compass screens now show clearer fallback states like "No Fix" and "No Heading" instead of misleading direction arrow that was untrustworthy .
  -- Compass math/logic was unified so node, waypoint, and location screens behave consistently.
  -- Small flash size cleanup in the new compass code.

Result
Compass data is more trustworthy, calibration is easier for users, and compass related screens behave more consistently.

T114 build with this PR
RAM: [==== ] 44.4% (used 110436 bytes from 248832 bytes)
Flash: [========= ] 88.6% (used 722068 bytes from 815104 bytes)

T114 build with Develop
RAM: [==== ] 44.4% (used 110436 bytes from 248832 bytes)
Flash: [========= ] 88.4% (used 720292 bytes from 815104 bytes)

20260414_233431.mp4

[Copilot]

Pull request overview

This PR refactors and improves compass behavior across UI screens by unifying heading/bearing math, improving calibration flow, persisting magnetometer calibration, and increasing UI refresh rate when compass data is active (addressing #9928’s “misleading compass” concerns).

Changes:

• Persist magnetometer calibration (save/load) and unify calibration flow across supported motion sensors.
• Unify heading/bearing computation via CompassRenderer helpers and improve UI fallback states (“No Fix” / “No Heading”).
• Smooth compass heading updates and raise target FPS (to 20) for compass-related frames.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/motion/MotionSensor.h	Faster sensor polling; adds shared calibration persistence + helper utilities.
src/motion/MotionSensor.cpp	Implements calibration record save/load and improved calibration UI frame text/layout.
src/motion/ICM20948Sensor.h / .cpp	Loads/saves calibration and uses shared calibration/orientation helpers.
src/motion/BMX160Sensor.h / .cpp	Loads/saves calibration and uses shared calibration/orientation helpers.
src/motion/BMM150Sensor.cpp	Uses shared compass orientation helper; removes unused IRQ flag.
src/graphics/draw/CompassRenderer.h / .cpp	Introduces shared heading/bearing helpers used across screens.
src/graphics/Screen.h / .cpp	Adds smoothed setHeading(float); improves GPS-estimated heading staleness handling; raises FPS on compass frames.
src/graphics/draw/UIRenderer.cpp	Uses shared heading helpers and displays “No Fix/No Heading” status in compass areas.
src/modules/WaypointModule.cpp	Updates waypoint compass rendering/fallback logic and uses shared heading helpers.
src/graphics/draw/NodeListRenderer.h / .cpp	Uses shared heading helpers and shows unknown-bearing markers when heading/fix is missing.