Use inline WYSIWYG markdown editor for long text messages

Desktop: replace the Write/Preview tab toggle in the compose card with
MDXEditor, an inline WYSIWYG that renders markdown as you type (Obsidian/
Notion feel) and round-trips plain markdown, matching how particle content
is stored. Immersive mode is unchanged — short, plain notes still get the
centered large-type textarea, and ⌘+M still drops into the rich editor.
Shortcut handling moves to the capture phase so ⌘+Enter / Esc win over the
editor's own key handling.

Mobile: render markdown on the display side via react-native-marked's
useMarkdown hook (no FlatList, so it nests cleanly in the existing
ScrollView). Mirrors desktop's immersive-vs-card logic: short plain notes
stay centered; anything with markdown renders formatted instead of showing
raw syntax. Composer stays plain text.

https://claude.ai/code/session_019DU6V5z6Nr4Vu7b1fBDnq4

js/mobile/yarn.lock

@@ -1700,6 +1700,16 @@
     "@jridgewell/resolve-uri" "^3.1.0"
     "@jridgewell/sourcemap-codec" "^1.4.14"
 
+"@jsamr/[email protected]":
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/@jsamr/counter-style/-/counter-style-2.0.2.tgz#6f08cfa98e1f0416dc1d7f2d8ac38a8cdb004c5d"
+  integrity sha512-2mXudGVtSzVxWEA7B9jZLKjoXUeUFYDDtFrQoC0IFX9/Dszz4t1vZOmafi3JSw/FxD+udMQ+4TAFR8Qs0J3URQ==
+
+"@jsamr/[email protected]":
+  version "2.3.1"
+  resolved "https://registry.yarnpkg.com/@jsamr/react-native-li/-/react-native-li-2.3.1.tgz#12a5b5f6e3971cec77b96bee58104eed0ae9314a"
+  integrity sha512-Qbo4NEj48SQ4k8FZJHFE2fgZDKTWaUGmVxcIQh3msg5JezLdTMMHuRRDYctfdHI6L0FZGObmEv3haWbIvmol8w==
+
 "@livekit/[email protected]":
   version "0.12.13"
   resolved "https://registry.yarnpkg.com/@livekit/components-core/-/components-core-0.12.13.tgz#83d935719453c6831086daffebfc434137ea6497"
@@ -3748,6 +3758,11 @@ getenv@^2.0.0:
   resolved "https://registry.yarnpkg.com/getenv/-/getenv-2.0.0.tgz#b1698c7b0f29588f4577d06c42c73a5b475c69e0"
   integrity sha512-VilgtJj/ALgGY77fiLam5iD336eSWi96Q15JSAG1zi8NRBysm3LXKdGnHb4m5cuyxvOLQQKWpBZAT6ni4FI2iQ==
 
+[email protected]:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/github-slugger/-/github-slugger-2.0.0.tgz#52cf2f9279a21eb6c59dd385b410f0c0adda8f1a"
+  integrity sha512-IaOQ9puYtjrkq7Y0Ygl9KDZnrf/aiUJYUpVf89y8kyaxbRG7Y1SrX/jaumrv81vc61+kiMempujsM3Yw7w5qcw==
+
 glob-parent@^5.1.2, glob-parent@~5.1.2:
   version "5.1.2"
   resolved "https://registry.yarnpkg.com/glob-parent/-/glob-parent-5.1.2.tgz#869832c58034fe68a4093c17dc15e8340d8401c4"
@@ -3899,6 +3914,11 @@ hosted-git-info@^7.0.0:
   dependencies:
     lru-cache "^10.0.1"
 
+[email protected]:
+  version "2.6.0"
+  resolved "https://registry.yarnpkg.com/html-entities/-/html-entities-2.6.0.tgz#7c64f1ea3b36818ccae3d3fb48b6974208e984f8"
+  integrity sha512-kig+rMn/QOVRvr7c86gQ8lWXq+Hkv6CbAH1hLu+RG338StTpE8Z0b44SDVaqVu7HGKf27frdmUYEs9hTUX/cLQ==
+
 http-errors@~2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/http-errors/-/http-errors-2.0.1.tgz#36d2f65bc909c8790018dd36fb4d93da6caae06b"
@@ -4680,6 +4700,11 @@ [email protected]:
   dependencies:
     tmpl "1.0.5"
 
+[email protected]:
+  version "18.0.3"
+  resolved "https://registry.yarnpkg.com/marked/-/marked-18.0.3.tgz#278b5ba89f1c7ccbaf0422f3ee8955928489220b"
+  integrity sha512-7VT90JOkDeaRWpfjOReRGPEKn0ecdARBkDGL+tT1wZY0efPPqkUxLUSmzy/C7TIylQYJC9STISEsCHrqb/7VIA==
+
 marky@^1.2.2:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/marky/-/marky-1.3.0.tgz#422b63b0baf65022f02eda61a238eccdbbc14997"
@@ -5753,6 +5778,24 @@ react-native-is-edge-to-edge@^1.2.1:
   resolved "https://registry.yarnpkg.com/react-native-is-edge-to-edge/-/react-native-is-edge-to-edge-1.3.1.tgz#feb9a6a8faf0874298947edd556e5af22044e139"
   integrity sha512-NIXU/iT5+ORyCc7p0z2nnlkouYKX425vuU1OEm6bMMtWWR9yvb+Xg5AZmImTKoF9abxCPqrKC3rOZsKzUYgYZA==
 
+react-native-marked@^8.1.0:
+  version "8.1.0"
+  resolved "https://registry.yarnpkg.com/react-native-marked/-/react-native-marked-8.1.0.tgz#7428ca7356aa4bee15f35ca17c52cf3b1823bc4b"
+  integrity sha512-nNsA0YZ73EvlZzSODms253gnZBYqxr4j3Qqf38NYAzmdVxULZMHB7qmt8yiYwtdEZ2IsTDxexlHckyhwLfjTlg==
+  dependencies:
+    "@jsamr/counter-style" "2.0.2"
+    "@jsamr/react-native-li" "2.3.1"
+    github-slugger "2.0.0"
+    html-entities "2.6.0"
+    marked "18.0.3"
+    react-native-reanimated-table "0.0.2"
+    svg-parser "2.0.4"
+
+[email protected]:
+  version "0.0.2"
+  resolved "https://registry.yarnpkg.com/react-native-reanimated-table/-/react-native-reanimated-table-0.0.2.tgz#015392dbc12fb03fd872d5a7eea9bc84c4f3a685"
+  integrity sha512-OeuqfU1AFEmHNTJlEOLWrV78JgAXnM0/ZrCm0Ab+9e5nwYJ+xab/UFXkNKz3Gyf08ZfLSNzwMQRjt3eZWPWoGA==
+
 react-native-reanimated@~4.1.1:
   version "4.1.7"
   resolved "https://registry.yarnpkg.com/react-native-reanimated/-/react-native-reanimated-4.1.7.tgz#b4e8524503a1b6ec1b5a40c460ee807a6a9fd2cf"
@@ -6457,6 +6500,11 @@ supports-preserve-symlinks-flag@^1.0.0:
   resolved "https://registry.yarnpkg.com/supports-preserve-symlinks-flag/-/supports-preserve-symlinks-flag-1.0.0.tgz#6eda4bd344a3c94aea376d4cc31bc77311039e09"
   integrity sha512-ot0WnXS9fgdkgIcePe6RHNk1WA8+muPa6cSjeR3V8K27q9BB1rTE3R1p7Hv0z1ZyAc8s6Vvv8DIyWf681MAt0w==
 
+[email protected]:
+  version "2.0.4"
+  resolved "https://registry.yarnpkg.com/svg-parser/-/svg-parser-2.0.4.tgz#fdc2e29e13951736140b76cb122c8ee6630eb6b5"
+  integrity sha512-e4hG1hRwoOdRb37cIMSgzNsxyzKfayW6VOflrwvR+/bzrkyxY/31WkbgnQpgtrNp1SdpJvpUAGTa/ZoiPNDuRQ==
+
 tailwind-merge@^3.5.0:
   version "3.5.0"
   resolved "https://registry.yarnpkg.com/tailwind-merge/-/tailwind-merge-3.5.0.tgz#06502f4496ba15151445d97d916a26564d50d1ca"