Schedule pickers, and target progress at one row

"Check feeds every" becomes a number plus a unit dropdown in both global
and per-feed settings; parse_interval gained weeks to back it. The
per-feed dropdown can select the global default, clearing the override.

Fixes progress painting every pending row: the event carried no enclosure
id, so the handler had nothing to target and set the width on all of them.
Adding a feed looked like it was downloading everything. Progress,
DownloadDone and DownloadError now carry the enclosure id.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AdXho5tTkjFLeUXKbEjKBh

src/config.rs

@@ -158,7 +158,8 @@ impl General {
 
 /// Parses a check interval into minutes.
 ///
-/// Accepts "every 30m", "30m", "4h", "1d", "every 4 hours", or a bare number of minutes.
+/// Accepts "every 30m", "30m", "4h", "1d", "2w", "every 4 hours", or a bare number of
+/// minutes.
 /// Returns None for anything it cannot read, or for zero.
 pub fn parse_interval(s: &str) -> Option<u64> {
     let s = s.trim().to_lowercase();
@@ -178,6 +179,7 @@ pub fn parse_interval(s: &str) -> Option<u64> {
         "" | "m" | "min" | "mins" | "minute" | "minutes" => n,
         "h" | "hr" | "hrs" | "hour" | "hours" => n.checked_mul(60)?,
         "d" | "day" | "days" => n.checked_mul(1440)?,
+        "w" | "week" | "weeks" => n.checked_mul(10080)?,
         _ => return None,
     };
     (mins > 0).then_some(mins)
@@ -339,6 +341,7 @@ mod tests {
             ("every 30m", 30), ("30m", 30), ("30", 30), ("every 30 minutes", 30),
             ("every 4h", 240), ("4h", 240), ("4 hours", 240), ("EVERY 4H", 240),
             ("1d", 1440), ("every 2 days", 2880), ("  every   90m  ", 90),
+            ("1w", 10080), ("every 2 weeks", 20160), ("2 w", 20160),
         ] {
             assert_eq!(parse_interval(input), Some(want), "{input:?}");
         }