fix(web): settings modal — table crash, tab restore, checkbox layout

Three separate settings bugs (all pre-existing, exposed once the modal actually
opened):

1. renderCalendarTable() referenced a bare `owned` variable (undefined in that
   scope; should be cal.owned) → ReferenceError on the first owned local calendar
   → renderAllAccounts threw → the calendar table never rendered. This was the
   ROOT cause of "settings won't open" (it threw out of openSettingsModal); the
   earlier try/catch only masked it. Fixed to cal.owned.

2. On reload, writeUrlState() (via fetchAndRender) ran before openSettingsModal
   activated the saved tab and wrote the HTML-default (Profile) tab into the URL,
   so every reload landed on Profile. Now the stab is only rewritten once the
   modal is actually shown; otherwise the saved one is preserved.

3. The directory-hidden checkbox label inherited the global ".form-group label"
   uppercase/spaced/12px styling, stretching the text into a broken column. A
   higher-specificity .checkbox-row rule restores normal inline layout.

v77.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/js/version.js

@@ -1,2 +1,2 @@
 // Increment APP_VERSION with every code change
-export const APP_VERSION = 'v76';
+export const APP_VERSION = 'v77';