Add the calendar view (M10)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

internal/ui/help.go

@@ -6,7 +6,7 @@ import (
 )
 
 const helpText = `[yellow]Global[-]
-  F1-F5                  switch view (also from the release and episode lists)
+  F1-F6                  switch view (also from the release and episode lists)
   Tab, Shift+Tab         switch panel within a view
   ?, F9                  this help (F9 works while typing)
   q, Ctrl+C              quit
@@ -37,6 +37,13 @@ const helpText = `[yellow]Global[-]
   i, Enter               movie: release search; series: seasons and episodes
   r                      reload
 
+[yellow]Calendar (F5)[-]
+  [ ]                    move the two-week window back / forward by a week
+  t                      back to today
+  u                      include unmonitored items
+  Enter, i               release search for the selected movie / episode
+  s                      automatic search          r  reload
+
 [yellow]Seasons and episodes[-]
   Enter                  season: expand/collapse; episode: release search
   i, s, t                release search, automatic search, toggle monitored
@@ -56,7 +63,7 @@ const helpText = `[yellow]Global[-]
   t                      retry a failed download (history)
   r                      refresh now
 
-[yellow]Log (F5)[-]
+[yellow]Log (F6)[-]
   Popups fade away by themselves; everything they said is kept here.
   ↑↓, PgUp/PgDn          scroll        G  follow new entries        c  clear