feat(app): add initial flatpak support

.gitmodules

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+[submodule "apps/app/distribute/linux/flatpak/flatpak-builder-tools"]
+	path = apps/app/distribute/linux/flatpak/flatpak-builder-tools
+	url = https://github.com/flatpak/flatpak-builder-tools.git

apps/app/distribute/linux/flatpak/io.github.keshav-writes-code.cherit.yml

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+id: io.github.keshav-writes-code.cherit
+
+runtime: org.gnome.Platform
+runtime-version: '47'
+sdk: org.gnome.Sdk
+
+command: cherit
+finish-args:
+  - --socket=wayland
+  - --socket=fallback-x11
+  - --device=dri
+  - --share=ipc
+  - --share=network
+  - --filesystem=home
+  - --filesystem=xdg-documents
+  - --filesystem=xdg-config
+sdk-extensions:
+  - org.freedesktop.Sdk.Extension.node20
+  - org.freedesktop.Sdk.Extension.rust-stable
+build-options:
+  append-path: /usr/lib/sdk/node20/bin:/usr/lib/sdk/rust-stable/bin
+
+modules:
+  - name: cherit
+    buildsystem: simple
+    env:
+      HOME: /run/build/cherit
+      CARGO_HOME: /run/build/cherit/cargo
+      XDG_CACHE_HOME: /run/build/cherit/flatpak-node/cache
+      yarn_config_offline: 'true'
+      yarn_config_cache: /run/build/cherit/flatpak-node/yarn-cache
+    sources:
+      - type: git
+        url: https://github.com/Keshav-writes-code/Cherit.git
+        branch: main
+      - type: file
+        path: cargo-sources.json
+      - type: file
+        path: node-sources.json
+    build-commands:
+      - echo -e 'yarn-offline-mirror "/run/build/cherit/flatpak-node/yarn-mirror"\nyarn-offline-mirror-pruning true' > .yarnrc
+      - mkdir -p apps/app/src-tauri/.cargo && echo -e '[source.crates-io]\nreplace-with = "vendored-sources"\n\n[source.vendored-sources]\ndirectory = "/run/build/cherit/cargo/vendor"' > apps/app/src-tauri/.cargo/config.toml
+      - yarn install --offline --immutable --immutable-cache --inline-builds
+      - yarn workspace cherit run tauri build -- -b deb
+      - ar -x apps/app/src-tauri/target/release/bundle/deb/*.deb
+      - |
+        if [ -f data.tar.xz ]; then
+          tar -xf data.tar.xz
+        else
+          tar -xf data.tar.gz
+        fi
+      - install -Dm755 usr/bin/cherit /app/bin/cherit
+      - sed -i 's/^Icon=cherit/Icon=io.github.keshav-writes-code.cherit/' usr/share/applications/cherit.desktop
+      - install -Dm644 usr/share/applications/cherit.desktop /app/share/applications/io.github.keshav-writes-code.cherit.desktop
+      - install -Dm644 usr/share/icons/hicolor/128x128/apps/cherit.png /app/share/icons/hicolor/128x128/apps/io.github.keshav-writes-code.cherit.png
+      - install -Dm644 usr/share/icons/hicolor/32x32/apps/cherit.png /app/share/icons/hicolor/32x32/apps/io.github.keshav-writes-code.cherit.png
+      - |
+        if [ -f usr/share/icons/hicolor/256x256@2/apps/cherit.png ]; then
+          install -Dm644 usr/share/icons/hicolor/256x256@2/apps/cherit.png /app/share/icons/hicolor/512x512/apps/io.github.keshav-writes-code.cherit.png
+        fi
+      - |
+        if [ -f usr/share/icons/hicolor/scalable/apps/cherit.svg ]; then
+          install -Dm644 usr/share/icons/hicolor/scalable/apps/cherit.svg /app/share/icons/hicolor/scalable/apps/io.github.keshav-writes-code.cherit.svg
+        fi
+      - install -Dm644 usr/share/metainfo/io.github.keshav-writes-code.cherit.metainfo.xml /app/share/metainfo/io.github.keshav-writes-code.cherit.metainfo.xml

apps/app/distribute/linux/flatpak/metainfo.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<component type="desktop-application">
+    <id>io.github.keshav-writes-code.cherit</id>
+    <launchable type="desktop-id">io.github.keshav-writes-code.cherit.desktop</launchable>
+    <name>Cherit</name>
+    <developer id="io.github.keshav-writes-code">
+        <name>Keshav-writes-code</name>
+    </developer>
+    <content_rating type="oars-1.1">
+    </content_rating>
+    <keywords>
+        <keyword>Markdown</keyword>
+        <keyword>Editor</keyword>
+        <keyword>Obsidian</keyword>
+        <keyword>Note-taking</keyword>
+        <keyword>Local-first</keyword>
+    </keywords>
+    <branding>
+        <color type="primary" scheme_preference="light">#8f4bf6</color>
+        <color type="primary" scheme_preference="dark">#8f4bf6</color>
+    </branding>
+    <recommends>
+        <display_length compare="ge">360</display_length>
+    </recommends>
+    <summary>A WSYIWYG Markdown Editor Inspired by Obsidian</summary>
+
+    <metadata_license>MIT</metadata_license>
+    <project_license>GPL-2.0</project_license>
+    <url type="homepage">https://github.com/Keshav-writes-code/Cherit</url>
+
+    <supports>
+        <control>pointing</control>
+        <control>keyboard</control>
+        <control>touch</control>
+    </supports>
+
+    <description>
+        <p>
+            Cherit is a cross-platform (mobile &amp; desktop), local-first version of Obsidian with syncing functionality built-in. It is designed to work in a seamless, hassle-free way, providing a WYSIWYG Markdown editing experience.
+        </p>
+    </description>
+    <screenshots>
+        <screenshot type="default">
+            <image>https://github.com/user-attachments/assets/920c3f9e-f2d0-498e-bcf4-a27b7117f71f</image>
+            <caption>Cherit Interface</caption>
+        </screenshot>
+        <screenshot>
+            <image>https://github.com/user-attachments/assets/a87a2221-1d46-4348-b382-880c9da05196</image>
+            <caption>Cherit Editor</caption>
+        </screenshot>
+    </screenshots>
+    <releases>
+        <release version="0.0.1" date="2026-02-01" >
+            <description>
+            <ul>
+                <li>Initial release</li>
+            </ul>
+            </description>
+        </release>
+    </releases>
+    <update_contact>keshav-writes-code@users.noreply.github.com</update_contact>
+</component>