feat: add display UI with splash screen, dashboard, and RSSI sparkline

Implement full SSD1306 OLED display support:
- Splash screen on boot (1.5s) with project name, version, board
- Dashboard showing radio state, config, counters, RSSI/SNR
- RSSI history sparkline (64-sample ring buffer, 2px-wide bars)
- DisplayOn/DisplayOff host commands routed via dedicated channel
- Pure render functions against generic DrawTarget (no hardware coupling)
- Display on/off control bypasses radio task entirely

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

vendor/pulldown-cmark/tests/suite/gfm_table.rs

@@ -0,0 +1,233 @@
+// This file is auto-generated by the build script
+// Please, do not modify it manually
+
+use super::test_markdown_html;
+
+#[test]
+fn gfm_table_test_1() {
+    let original = r##"| foo | bar |
+| --- | --- |
+| baz | bim |
+"##;
+    let expected = r##"<table>
+<thead>
+<tr>
+<th>foo</th>
+<th>bar</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>baz</td>
+<td>bim</td>
+</tr>
+</tbody>
+</table>
+"##;
+
+    test_markdown_html(original, expected, false, false, false);
+}
+
+#[test]
+fn gfm_table_test_2() {
+    let original = r##"| abc | defghi |
+:-: | -----------:
+bar | baz
+"##;
+    let expected = r##"<table>
+<thead>
+<tr>
+<th style="text-align: center">abc</th>
+<th style="text-align: right">defghi</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td style="text-align: center">bar</td>
+<td style="text-align: right">baz</td>
+</tr>
+</tbody>
+</table>
+"##;
+
+    test_markdown_html(original, expected, false, false, false);
+}
+
+#[test]
+fn gfm_table_test_3() {
+    let original = r##"| f\|oo  |
+| ------ |
+| b `\|` az |
+| b **\|** im |
+"##;
+    let expected = r##"<table>
+<thead>
+<tr>
+<th>f|oo</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>b <code>|</code> az</td>
+</tr>
+<tr>
+<td>b <strong>|</strong> im</td>
+</tr>
+</tbody>
+</table>
+"##;
+
+    test_markdown_html(original, expected, false, false, false);
+}
+
+#[test]
+fn gfm_table_test_4() {
+    let original = r##"| abc | def |
+| --- | --- |
+| bar | baz |
+> bar
+"##;
+    let expected = r##"<table>
+<thead>
+<tr>
+<th>abc</th>
+<th>def</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>bar</td>
+<td>baz</td>
+</tr>
+</tbody>
+</table>
+<blockquote>
+<p>bar</p>
+</blockquote>
+"##;
+
+    test_markdown_html(original, expected, false, false, false);
+}
+
+#[test]
+fn gfm_table_test_5() {
+    let original = r##"| abc | def |
+| --- | --- |
+| bar | baz |
+bar
+
+bar
+"##;
+    let expected = r##"<table>
+<thead>
+<tr>
+<th>abc</th>
+<th>def</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>bar</td>
+<td>baz</td>
+</tr>
+<tr>
+<td>bar</td>
+<td></td>
+</tr>
+</tbody>
+</table>
+<p>bar</p>
+"##;
+
+    test_markdown_html(original, expected, false, false, false);
+}
+
+#[test]
+fn gfm_table_test_6() {
+    let original = r##"| abc | def |
+| --- |
+| bar |
+"##;
+    let expected = r##"<p>| abc | def |
+| --- |
+| bar |</p>
+"##;
+
+    test_markdown_html(original, expected, false, false, false);
+}
+
+#[test]
+fn gfm_table_test_7() {
+    let original = r##"| abc | def |
+| --- | --- |
+| bar |
+| bar | baz | boo |
+"##;
+    let expected = r##"<table>
+<thead>
+<tr>
+<th>abc</th>
+<th>def</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>bar</td>
+<td></td>
+</tr>
+<tr>
+<td>bar</td>
+<td>baz</td>
+</tr>
+</tbody>
+</table>
+"##;
+
+    test_markdown_html(original, expected, false, false, false);
+}
+
+#[test]
+fn gfm_table_test_8() {
+    let original = r##"| abc | def |
+| --- | --- |
+"##;
+    let expected = r##"<table>
+<thead>
+<tr>
+<th>abc</th>
+<th>def</th>
+</tr>
+</thead>
+<tbody></tbody>
+</table>
+"##;
+
+    test_markdown_html(original, expected, false, false, false);
+}
+
+#[test]
+fn gfm_table_test_9() {
+    let original = r##"Hello World
+| abc | def |
+| --- | --- |
+| bar | baz |
+"##;
+    let expected = r##"<p>Hello World</p>
+<table>
+<thead>
+<tr>
+<th>abc</th>
+<th>def</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>bar</td>
+<td>baz</td>
+</tr>
+</tbody>
+</table>
+"##;
+
+    test_markdown_html(original, expected, false, false, false);
+}