# V3-05 — Mounted (handlebar) mode

**Phase** Live map · **Depends on** V3-04 · **Size** M · **Status** Not started

## Goal
Make the app usable on handlebars in daylight, at speed, with gloves — as an explicit mode
rather than an accident.

## Context
v1 and v2 were built entirely around "start it, pocket it, stop it". **A mounted phone is a
different product.** Treating it as a mode makes the differences deliberate instead of
half-met.

## Design
A toggle that changes several things at once:

- **Keep the screen awake** for the whole ride (`wakelock_plus`). Currently the screen
  sleeps and recording continues; mounted, that is wrong.
- **Sunlight legibility.** The dark theme was chosen for glanceability at night and in a
  pocket-glance. Behind a visor in daylight it is the wrong choice — a high-contrast
  variant with larger figures is needed. This is not the same as V3-16's visual identity.
- **Larger touch targets still.** 72 dp works stopped; at speed with gloves it does not.
- **Interruptions.** What happens on an incoming call or a notification — the recording
  must survive and the screen must come back.

## Implementation
1. `mountedMode` in `Config`, surfaced in settings and as a quick toggle on the record
   screen
2. `wakelock_plus`, acquired on start when mounted, released on stop/pause — and released
   on `dispose`, or the screen stays lit after the app closes
3. A high-contrast text scale applied when mounted
4. Handle `AppLifecycleState.inactive` (a call arriving) distinctly from `paused`

## Acceptance criteria
- [ ] Mounted: the screen never sleeps during a ride
- [ ] Un-mounted: behaviour is exactly as today
- [ ] The wake lock is released on stop, on discard, and on app exit
- [ ] An incoming call does not stop recording
- [ ] Battery cost of mounted mode is measured and written down (V3-13)

## Tests
- Widget: mounted toggle changes text scale and requests the wake lock (fake the plugin)
- Widget: the lock is released on stop
- **Manual, on a real bike** — legibility in daylight cannot be tested any other way

## Risks
- **A leaked wake lock flattens the battery**, silently and after the app is closed. Test
  the release path harder than the acquire path.
- Legibility is a judgement call that needs a real ride in real sun.

## Out of scope
A dedicated mounted layout with different information architecture — start by scaling what
exists and see what the ride teaches.