docs(eink): the two e-ink builds in the docs and the site's sim

Docs: the E-ink section describes the landscape and portrait builds, what
the tall screens add, and the settings, with three screenshots; the e-ink
build flags; the release file names. Sim: each orientation gets its own
factory, so a page can load both, and simEinkScale 0 leaves the canvas'
CSS size to the page. CI builds both into solo-sim-wasm.zip (wasm/eink/).

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

docs/solo/README.md

@@ -39,9 +39,9 @@ These docs mark the differences with notes like this:
 | **Keyboard** | M5Stack Cardputer ADV, T-Echo Lite + KeyShield, any board with a CardKB | Keys; arrows or their Fn combinations for the directions |
 | **Touch** | Wio Tracker L2 | Taps, swipes and holds; two side buttons |
 
-| OLED / e-ink | | Wio Tracker L2 |
+| OLED | E-ink | Wio Tracker L2 |
 | :---: | :---: | :---: |
-| ![Clock page](./img/oled-clock.png) | ![Status page](./img/oled-status.png) | ![Home screen](./img/l2-home.png) |
+| ![Clock page](./img/oled-clock.png) | ![A channel](./img/eink-channel.png) | ![Home screen](./img/l2-home.png) |
 
 The joystick and keyboard devices share one interface, sized for small OLED
 and e-ink screens. The Wio Tracker L2 has its own, built for a 320 × 240

docs/solo/developer/build-flags.md

@@ -84,6 +84,8 @@ existing `solo/<board>/platformio.ini` for what's already claimed).
 | --- | --- |
 | `OLED_MISC_FIXED_FONT=1` | Pulls in a full Latin/Greek/Cyrillic 6×9 fixed font (~14 KB flash) so typed text in those alphabets renders as itself instead of block placeholders. Worth it on any board with a keyboard; skip it on space-constrained builds without one. |
 | `DISPLAY_ROTATION=<0-3>` | Rotates the panel in 90° steps, for a board mounted sideways or upside down. |
+| `EINK_LARGE_FONT=1` | E-ink: writes in the 8×13 font at the panel's own resolution, with the larger icon set. The landscape e-ink build sets it; the narrow portrait screen keeps the 6×9. |
+| `JOYSTICK_UPRIGHT_ROTATION=<0-3>` | The display rotation at which the joystick reads upright; the joystick then turns with the screen. Set by the e-ink builds. |
 | `ENABLE_SCREENSHOT` | Lets the site's [USB tools](https://solo.marekzegarek.com/#pc-tools) (or `tools/screenshot.py`) capture the screen over USB. A colour screen (the L2) renders a fresh frame and sends it as RGB565. |
 | `KEEP_DISPLAY_ON_USB` | Refreshes the auto-off deadline continuously while externally (USB) powered, so the auto-off timer only starts counting once power is actually removed. Off by default because OLED panels burn in quickly with a permanently-lit screen — only worth enabling for an LCD/e-ink target, or a display you don't mind replacing. |
 | `AUTO_OFF_MILLIS=<ms>` | How long the display stays on before auto-off. Default 15000 (15s); `0` disables auto-off entirely. |

docs/solo/hardware.md

@@ -64,16 +64,35 @@ Fn shortcuts.
 
 ## E-ink
 
-The e-ink Wio Tracker L1 (250 × 122) has a few settings of its own in
-Settings › Display:
+The e-ink Wio Tracker L1 (250 × 122) comes in two builds, one per
+orientation, since every screen is laid out for one shape:
 
-- **Rotation**: landscape or portrait, applied at once; every screen reflows.
-- **Joystick rotation**, independent of the display's.
-- **Full refresh**: how many partial updates between full ones, against
+- **Landscape** writes in a larger 8 × 13 font, with larger icons.
+- **Portrait** keeps the 6 × 9 font and fits more lines.
+
+| Landscape | Portrait | |
+| :---: | :---: | :---: |
+| ![A channel in landscape](./img/eink-channel.png) | ![Clock and calendar in portrait](./img/eink-clock.png) | ![The sky view in portrait](./img/eink-sky.png) |
+
+The e-ink screens show more than the OLED, the portrait one most:
+
+- a month calendar (portrait) under the clock and on the lock screen, the
+  alarm's days marked;
+- whole message bubbles;
+- charts of the last 8 hours on the Status screen;
+- a compass rose and the path's hops on a contact's details, and direction
+  arrows in the node list;
+- under a saved trail (portrait), its map and elevation profile.
+
+Settings › Display has a few settings of its own:
+
+- **Rotation** turns the screen upside down; the joystick turns with it.
+- **Joystick** rotation, for a joystick mounted another way.
+- **Full rfsh**: how many partial updates between full ones, against
   ghosting.
 
-Clock seconds are hidden by default, and live timers refresh coarsely, to
-spare the panel.
+The panel refreshes only when what it shows changes. Times are shown to the
+minute (no seconds counting up), and clock seconds are hidden by default.
 
 ## Wio Tracker L2