feat(lea): improve assignments list UI, parsing, and accessibility

- Revamp assignments list: group categories and render grid-style cards
- Add keyboard and ARIA support for card interaction
- Improve due date parsing and relative date display
- Show empty state when no assignments found
- Detect submission and unread status more reliably
- Create safe click handlers from raw onclick attributes
- Bump userscript version to 1.3.12 and update dist artifacts
- Set webpack output.publicPath to empty string for builds

Author: EvanNotFound

dist/main.a110861f43d70d4757d2.hot-update.json

@@ -0,0 +1 @@
+{"c":["main"],"r":[],"m":[]}

dist/main.a110861f43d70d4757d2.hot-update.meta.js

@@ -0,0 +1,13 @@
+// ==UserScript==
+// @name Omnivox UI Optimizer
+// @description A simple user script to improve the UI of Omnivox.
+// @version 1.3.12
+// @author Evan Luo
+// @homepage https://github.com/evannotfound/omnivox-optimizer
+// @match *://*.omnivox.ca/*
+// @downloadURL https://github.com/evannotfound/omnivox-optimizer/releases/latest/download/omnivox-optimizer.user.js
+// @grant GM_xmlhttpRequest
+// @license GPL-3.0
+// @run-at document-start
+// @updateURL https://github.com/evannotfound/omnivox-optimizer/releases/latest/download/omnivox-optimizer.meta.js
+// ==/UserScript==

dist/main.a110861f43d70d4757d2.hot-update.user.js

@@ -1,7 +1,7 @@
 // ==UserScript==
 // @name Omnivox UI Optimizer
 // @description A simple user script to improve the UI of Omnivox.
-// @version 1.3.10
+// @version 1.3.12
 // @author Evan Luo
 // @homepage https://github.com/evannotfound/omnivox-optimizer
 // @match *://*.omnivox.ca/*