Free memory on the CYD and drop the old manual profile (0.2.50)

The CYD restarted under load: a slider fill rounded less than its track made
LVGL draw the fill into a buffer of its own size on every redraw (15-20 KB), and
when that allocation failed the refresh retried until the task watchdog fired.
Track and fill now share one radius, and tests/test_layer_free.py keeps every
layer-making style out of the profiles, the packages and the firmware headers.

A tile keeps only the fields every card uses; climate modes, select options,
weather, sun and timer times, the media title and the vacuum rows moved to an
Extra block that exists only while a state needs one, and the state copy became
a fingerprint. runtime_tiles::model went from 24,296 to 8,216 bytes.

The manual profile that bound tiles to fixed entities in the YAML is gone:
331 TILE* substitutions, DYNAMIC_TILES/TILE_COUNT/DIRECT_ACTIONS, the 80 Home
Assistant subscriptions, its tap handlers and scripts, its own vacuum card, its
guides and helper scripts, and the five stale header copies in the repository
root that two C++ tests were compiling instead of the components. esphome config
of both Easy profiles is unchanged by that cleanup.

tile_scroll and the wake overlay no longer light up on a tap, and the debug
sensor min_free reports the lowest free heap since boot. On the bench CYD static
RAM went from 32.0% to 22.8% and free heap from 64-77 KB to about 101 KB, with
78 KB as the lowest point over thirteen hours without a restart.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

screen_manager/CHANGELOG.md

@@ -1,3 +1,14 @@
+## 0.2.50 (firmware 0.2.43)
+
+More memory for the CYD, so a busy moment no longer restarts it.
+
+- **Sliders without extra buffers.** The fill of the tile and light card sliders now has the same rounded corners as its track. With the tighter corners it had since 0.2.43, the screen drew every fill into a separate buffer of up to 20 KB on each redraw, and when the CYD ran short of memory it kept retrying until its watchdog restarted it. The end of the fill is now slightly rounder behind the white handle.
+- **Leaner tiles.** Climate modes, a select's options, weather, sun and timer times, the media title and the vacuum rows now only take memory on tiles that use them, and a tile keeps a short fingerprint of its last state instead of a full copy. That frees about 16 KB of RAM on the CYD.
+- **The old manual setup is gone.** Before ESP Screens existed, tiles were written by hand in the screen's YAML. Nothing used that any more, and it cost a screen memory: 80 Home Assistant subscriptions, its own tap handlers and an old vacuum card it never showed. All of it is out, together with its guides and helper scripts. Choosing tiles, the top bar, the settings and the calibration work exactly as before. The unused sensor **SmartDisplay Action** disappears: Home Assistant shows it as unavailable and you can delete it.
+- **No pale flash.** A tap between two tiles, or the tap that wakes a dimmed screen, lit up a pale panel. It stays transparent now, on both boards.
+- **Heap Minimum Free.** A new diagnostic sensor shows the lowest free memory since the screen started.
+- Firmware 0.2.43 for both boards; the app offers the update.
+
 ## 0.2.49 (firmware 0.2.42)
 
 No more flickering stripes on the CYD.