build(solo): the 4.26" panel as a fourth L1 e-ink env

WioTrackerL1Eink426_solo_dual extends eink_solo like the 4.2" build and
sets only what differs: the panel, rotation, the 9x15 at 2x with Text and
Icon size, bulk writes at 8 MHz, 250 contacts and a 32-message queue.
Replaces the full copy of the flags in solo/wio-tracker-l1-gdeq0426/.
Docs: advert precision, text and icon size, the 4.26" in the feature matrix.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/solo/developer/feature-matrix.md

@@ -18,6 +18,7 @@ to some screens, adds or corrects its row here in the same commit.
 | **E-ink L** | Wio Tracker L1 e-ink, landscape | 250 × 122, 8 × 13 | Larger icons |
 | **E-ink P** | Wio Tracker L1 e-ink, portrait | 122 × 250, 6 × 9 | |
 | **E-ink 4.2"** | Wio Tracker L1 with the 4.2" panel (parked) | 400 × 300, 9 × 15 | Its own icon set |
+| **E-ink 4.26"** | Wio Tracker L1 with the 4.26" 800 × 480 panel (`WioTrackerL1Eink426_solo_dual`) | 400 × 240 at 2x, 9 × 15 | Text and icon size settings; "wide" like the 4.2", 16 lines |
 | **L2** | Wio Tracker L2 | 320 × 240 touch, ui-lvgl | |
 
 What decides it in ui-new (look for these when adding a screen):

docs/solo/settings.md

@@ -7,7 +7,7 @@ board supports are shown.
 
 | Section | What's there |
 | ------- | ------------ |
-| **Display** | Brightness, auto-off, wake on message, the message alert (banner, corner envelope or off), lock screen, the lock clock's look and the [PIN](./lock.md), battery as icon / % / volts, time zone, clock format and seconds; on e-ink also rotation and full refresh |
+| **Display** | Brightness, auto-off, wake on message, the message alert (banner, corner envelope or off), lock screen, the lock clock's look and the [PIN](./lock.md), battery as icon / % / volts, time zone, clock format and seconds; on e-ink also rotation and full refresh, and on a 4.26" panel the text and icon size |
 | **Sound** | Buzzer on / off / auto (quiet while the app is connected), volume, quiet hours, the melody for messages, channels and adverts |
 | **Home Pages** | Order of the home pages, and which are shown |
 | **Radio** | TX power, preset, frequency, SF / BW / CR, saved presets, Auto pwr, the scope list, then the advanced options (below) |
@@ -56,6 +56,10 @@ nodes aren't added until you make room.
   including the automatic ones. Off, nodes see your name but not where you
   are. Live sharing and `{loc}` in a message still send it, because you send
   those on purpose.
+- **Precision**: how exactly adverts give your position: **Exact**, or
+  rounded to a grid of about **100 m**, **500 m** or **1 km**. A fixed grid,
+  not random noise, so many adverts from one place can't be averaged back
+  to the exact spot.
 - **Position**: where your adverts say you are while the GPS is off. **Enter**
   to type it in (`50.06143, 19.93658`), take it from a waypoint, or clear it.
   With the GPS on, the row shows **GPS** and each fix replaces it; turning the

solo/wio-tracker-l1-eink/platformio.ini

@@ -10,7 +10,7 @@
 ; portrait keeps the 6x9, whose narrow width wants the smaller cell. The
 ; joystick reads upright with the panel at rotation 1 (landscape) and turns
 ; with it (JOYSTICK_UPRIGHT_ROTATION). A third for a 4.2" 400x300 panel on the
-; same wiring, in the 9x15.
+; same wiring, in the 9x15, and a fourth for a 4.26" 800x480 one.
 ;
 ; All: Dual BLE+USB with added Solo.
 [eink_solo]
@@ -58,3 +58,25 @@ build_flags = ${eink_solo.build_flags}
   -D DISPLAY_ROTATION=0
   -D JOYSTICK_UPRIGHT_ROTATION=0
   -D EINK_LARGE_FONT=2
+
+; A 4.26" 800x480 panel (Good Display GDEQ0426T82) on the same 24-pin FPC.
+; Native landscape; the 9x15 font at 2x (~44 characters x 16 lines), with
+; Settings > Display > Text size and Icon size (EINK_FONT_SCALE,
+; STATUS_ICON_SCALE). Rows sent to the panel in bulk at 8 MHz
+; (EINK_FAST_WRITES, GxEPD2_FastWrite.h). Its 48 KB framebuffer leaves the
+; heap short at boot, so fewer contacts and a smaller offline queue.
+[env:WioTrackerL1Eink426_solo_dual]
+extends = eink_solo
+build_unflags = ${eink_solo.build_unflags} -D EINK_DISPLAY_MODEL=GxEPD2_213_B74 -D DISPLAY_ROTATION=1
+  -D JOYSTICK_UPRIGHT_ROTATION=1 -D MAX_CONTACTS=350 -D OFFLINE_QUEUE_SIZE=128
+build_flags = ${eink_solo.build_flags}
+  -D EINK_DISPLAY_MODEL=GxEPD2_426_GDEQ0426T82
+  -D DISPLAY_ROTATION=0
+  -D JOYSTICK_UPRIGHT_ROTATION=0
+  -D EINK_LARGE_FONT=2
+  -D EINK_FONT_SCALE=2
+  -D STATUS_ICON_SCALE=0
+  -D EINK_FAST_WRITES=1
+  -D EINK_SPI_HZ=8000000
+  -D MAX_CONTACTS=250
+  -D OFFLINE_QUEUE_SIZE=32

solo/wio-tracker-l1-gdeq0426/platformio.ini

@@ -1,72 +0,0 @@
-; Solo build for Seeed Wio Tracker L1 (Lite) + Good Display GDEQ0426T82
-; 4.26" 800x480 e-ink, plugged into the board's 24-pin e-ink FPC connector.
-; Build config only -- no source changes. Extends WioTrackerL1Eink
-; (variants/wio-tracker-l1-eink/platformio.ini) for its source files and
-; libraries, but carries its own full build_flags list, so the stock panel's
-; -D EINK_DISPLAY_MODEL / DISPLAY_ROTATION never reach the compiler too.
-;
-;  - EINK_DISPLAY_MODEL  GxEPD2 driver for this panel (GxEPD2 1.6.2+)
-;  - DISPLAY_ROTATION    0: the panel's native landscape
-;  - RAM: the 800x480 framebuffer is 48 KB (the stock 2.13" needs ~4 KB),
-;    and UiCore plus every screen is allocated from the heap at startup --
-;    a failed allocation there crashes into a boot loop. So:
-;      OFFLINE_QUEUE_SIZE  32  (stock e-ink: 128)  frees ~17 KB
-;      MAX_CONTACTS       250  (stock: 350)        frees ~18 KB
-;  - EINK_LARGE_FONT     2: the 4.2" build's 9x15 font (and its 9 px icons) --
-;    on hardware it reads much better here than the 6x9 scaled up, which goes
-;    blocky at 4x.
-;  - EINK_FONT_SCALE     2: that font at 2x (18x30 cells, ~44 characters x 16
-;    lines). Also adds Settings > Display > Text size (1x-5x), which starts here.
-;  - STATUS_ICON_SCALE   turns on scalable Home status/page icons and adds
-;    Settings > Display > Icon size (Auto = 1.5x the text: 3x at 2x text, 1x-8x).
-;
-; Build: pio run -e WioTrackerL1_GDEQ0426T82_companion_solo_dual
-[env:WioTrackerL1_GDEQ0426T82_companion_solo_dual]
-extends = WioTrackerL1Eink
-build_unflags = -Ofast
-build_flags = ${nrf52_base.build_flags}
-  ${sensor_base.build_flags}
-  -I lib/nrf52/s140_nrf52_7.3.0_API/include
-  -I lib/nrf52/s140_nrf52_7.3.0_API/include/nrf52
-  -I variants/wio-tracker-l1
-  -I examples/companion_radio/ui-new
-  -I lib/GxEPD2-patch/src
-  -D WIO_TRACKER_L1
-  -D WIO_TRACKER_L1_EINK
-  -D USE_SX1262
-  -D RADIO_CLASS=CustomSX1262
-  -D WRAPPER_CLASS=CustomSX1262Wrapper
-  -D LORA_TX_POWER=22
-  -D SX126X_CURRENT_LIMIT=140
-  -D SX126X_RX_BOOSTED_GAIN=1
-  -D EINK_DISPLAY_MODEL=GxEPD2_426_GDEQ0426T82
-  -D DISPLAY_ROTATION=0
-  -D JOYSTICK_UPRIGHT_ROTATION=0
-  -D EINK_LARGE_FONT=2
-  -D EINK_FONT_SCALE=2
-  -D STATUS_ICON_SCALE=0
-  -D GPS_BAUD_RATE=9600
-  -D ENV_PIN_SDA=PIN_WIRE1_SDA
-  -D ENV_PIN_SCL=PIN_WIRE1_SCL
-  -D DISABLE_DIAGNOSTIC_OUTPUT
-  -D AUTO_OFF_MILLIS=0
-  -D MAX_CONTACTS=250
-  -D MAX_GROUP_CHANNELS=40
-  -D OFFLINE_QUEUE_SIZE=32
-  -D DISPLAY_CLASS=GxEPDDisplay
-  -D BUTTON_USE_INTERRUPTS=1
-  -D UI_HAS_JOYSTICK=1
-  -D UI_HAS_JOYSTICK_UPDOWN=1
-  -D PIN_BUZZER=12
-  -D QSPIFLASH=1
-  -D FIRMWARE_SOLO_BUILD=1
-  -D MESHCORE_VERSION='"1.17.1"'
-  -D UI_SENSORS_PAGE=1
-  -D BLE_PIN_CODE=123456
-  -D DUAL_SERIAL=1
-  -D ENABLE_SCREENSHOT
-  -D KEEP_DISPLAY_ON_USB
-  -D EINK_FAST_WRITES=1
-  -D EINK_SPI_HZ=8000000
-  -Os
-extra_scripts = post:create-uf2.py