chore: add Prettier for Markdown in lint-staged; format existing md files

Author: euxx

AGENTS.md

@@ -9,8 +9,9 @@ After modifying code, ensure to run the following commands to maintain code qual
 - `npm run all` - Full build for release (ci + build Chrome & Firefox)
 
 Or run individually:
+
 - `npm test` - Run tests (Vitest)
 - `npm run lint` - Lint code
 - `npm run format` - Format code with Prettier
 
-Refer to [DEVELOPMENT.md](DEVELOPMENT.md) for more details on available scripts and project setup.
+Refer to [DEVELOPMENT.md](DEVELOPMENT.md) for more details on available scripts and project setup.

CHANGELOG.md

@@ -7,31 +7,36 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ## [1.0.4] - 2026-06-10
 
 ### Fixed
+
 - Replace all `innerHTML` assignments with safe DOM API construction (createElement, textContent, replaceChildren, createContextualFragment) to satisfy Firefox AMO linter requirements
 - Add `getIconSVGElement()` utility using `createContextualFragment` for safe SVG injection without innerHTML
 - Add `data_collection_permissions` to Firefox manifest as required by AMO
 
 ## [1.0.3] - 2026-03-10
 
 ### Fixed
+
 - Race condition where a 60-second auto-refresh could restore notifications already dismissed via mark-as-read, mark-all-as-read, mark-repo-as-read, or desktop notification click
 - In-progress detail fetches now abort if a user action invalidates their snapshot, preventing stale data from being written back to storage
 - Badge "+" indicator now only updates when a fetch actually commits to storage
 
 ## [1.0.2] - 2026-03-04
 
 ### Improved
+
 - Unified stagger animation for all mark-as-read flows
 - Eliminated redundant GET_STATE round-trip after mark-repo-as-read
 
 ## [1.0.1] - 2026-03-03
 
 ### Fixed
+
 - Mark-as-read animation reworked to use overlay approach, fixing dark band artifact in scroll containers
 - Reduced right-side jump when adjusting popup width
 - CSS variables standardized across device-flow and popup styles
 
 ### Improved
+
 - DOM removal now deferred until API confirms success for all mark-as-read flows
 - Stagger timeouts properly tracked and cancellable on rollback
 - Notification cache cleared on mark-all-as-read to prevent stale data

DEVELOPMENT.md

@@ -19,19 +19,19 @@
 
 ## Scripts
 
-| Command                | Description                                   |
-| ---------------------- | --------------------------------------------- |
-| `npm run ci`           | Run all checks (test + lint:fix + format)     |
-| `npm run dev`          | Run CI then prepare Firefox dev environment   |
-| `npm run all`          | Run CI then build Chrome & Firefox packages   |
-| `npm test`             | Run tests (Vitest)                            |
-| `npm run prepare`      | Setup Husky git hooks                         |
-| `npm run lint`         | Lint code                                     |
-| `npm run lint:fix`     | Lint and auto-fix                             |
-| `npm run format`       | Format code with Prettier                     |
-| `npm run format:check` | Check code formatting                         |
-| `npm run build`        | Build Chrome and Firefox packages             |
-| `npm run dev:firefox`  | Create Firefox dev environment                |
+| Command                | Description                                 |
+| ---------------------- | ------------------------------------------- |
+| `npm run ci`           | Run all checks (test + lint:fix + format)   |
+| `npm run dev`          | Run CI then prepare Firefox dev environment |
+| `npm run all`          | Run CI then build Chrome & Firefox packages |
+| `npm test`             | Run tests (Vitest)                          |
+| `npm run prepare`      | Setup Husky git hooks                       |
+| `npm run lint`         | Lint code                                   |
+| `npm run lint:fix`     | Lint and auto-fix                           |
+| `npm run format`       | Format code with Prettier                   |
+| `npm run format:check` | Check code formatting                       |
+| `npm run build`        | Build Chrome and Firefox packages           |
+| `npm run dev:firefox`  | Create Firefox dev environment              |
 
 ## Project Structure
 

README.md

@@ -18,6 +18,7 @@
 - ✨ Clean, minimal UI — feature-rich without the clutter
 - 🎨 Light / Dark / System theme with adjustable popup width
 
+<!-- prettier-ignore -->
 | | |
 |---|---|
 | <img src=".github/assets/notifications.png" alt="Notifications" width="400"> | <img src=".github/assets/actions.gif" alt="Actions" width="400"> |

RELEASE.md

@@ -6,33 +6,41 @@
    - Add version entry: `## [X.Y.Z] - YYYY-MM-DD` with changes
 
 2. Update version in `package.json`, `manifest.json`, and `manifest-firefox.json`:
+
    ```sh
    # Edit all three files to set "version": "X.Y.Z"
    ```
+
    Then run `npm install` to sync `package-lock.json`:
+
    ```sh
    npm install
    ```
 
 3. Commit changes:
+
    ```sh
    git add CHANGELOG.md package.json package-lock.json manifest.json manifest-firefox.json
    git commit -m "chore: update version to vX.Y.Z"
    git push origin main
    ```
 
 4. Run the release workflow:
+
    ```sh
    gh workflow run release.yml
    ```
+
    This will run tests, build Chrome & Firefox packages, and create a GitHub Release with the zip files.
 
 5. Verify the release was created successfully:
+
    ```sh
    gh release view vX.Y.Z
    ```
 
 6. Update the release notes on GitHub to match CHANGELOG.md:
+
    ```sh
    gh release edit vX.Y.Z --notes "## Improved
    - Change 1

package.json

@@ -23,6 +23,9 @@
     ],
     "*.{html,css}": [
       "prettier --write"
+    ],
+    "*.md": [
+      "prettier --write --prose-wrap preserve"
     ]
   },
   "keywords": [