Fix login accessibility, remove ALL CAPS, and make today button always-visible master
- Login: improve trust text contrast (#595959, 7:1 ratio), add password label, add role="alert" to error container, include recovery hint in error message - Remove all 30 text-transform: uppercase declarations across 13 app workspace files, lowercase HTML text to match, remove paired letter-spacing - Facet modal: lowercase heading, label, and button text - Today button: always visible with de-emphasized/prominent states based on current day, add aria-label and :focus-visible ring - Update test assertion to match new error message Files changed: convey/templates/login.html, convey/root.py, convey/static/app.css, convey/static/app.js, convey/templates/date_nav.html, tests/test_password.py, and 14 app workspace files (search, home, settings, agents, health, dev, entities, todos, import, stats, calendar/_day, graph, support, stats/dashboard.js)