feat(nvim): enable calendar.vim event loading from local ICS cache

Sets g:calendar_google_calendar so calendar.vim attempts to load events,
falling back to the cache populated by ics-to-calendarim.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

nvim/init.lua

@@ -64,6 +64,9 @@ vim.g.airline_section_x = "IP:" .. ipaddr .. " DNS:" .. hostname
 vim.g.loaded_ruby_provider = 0
 vim.g.loaded_perl_provider = 0
 
+-- calendar.vim: enable event loading (reads local cache populated by ics-to-calendarim)
+vim.g.calendar_google_calendar = 1
+
 -- ── Editor options ────────────────────────────────────────────────────────────
 vim.cmd("filetype plugin indent on")
 vim.cmd("syntax enable")