Add sort_by ordering for the log viewer, with a missing-param fallback/drop toggle (ticket 045)

/api/logs now accepts sort_by (an already-declared param name) and
sort_missing_fallback: lines carrying that param are ordered by its value,
while lines missing it are either appended in ottyl_seq order (fallback,
the default) or dropped from the response. Default ottyl_ts-tracking
order is unchanged when sort_by is omitted.

The log viewer (both the inline panel and its popout) exposes this as a
"Sort by" control next to the column picker, persisted to localStorage
under one shared key (ottyl.logPreview.sort) — the same global-viewer-
setting convention already used for visible param columns and the log
viewer's height, since there's no per-dashboard scope for this to divide
by.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o

webapp/src/lib/api.ts

@@ -244,6 +244,10 @@ export function fetchLogs(params: {
   endMs?: number
   limit?: number
   filter?: string
+  /** Ticket 045: an already-declared param name to order entries by, instead of the default (`ottyl_ts`-tracking) order. */
+  sortBy?: string
+  /** Ticket 045: only meaningful alongside `sortBy`. `true` (default) orders lines missing that param by `ottyl_seq`, appended after the sorted lines; `false` drops them. */
+  sortMissingFallback?: boolean
 }): Promise<LogEntry[]> {
   const search = new URLSearchParams()
   if (params.sinceSequence !== undefined) search.set('since_sequence', String(params.sinceSequence))
@@ -251,6 +255,8 @@ export function fetchLogs(params: {
   if (params.endMs !== undefined) search.set('end_ms', String(params.endMs))
   if (params.limit !== undefined) search.set('limit', String(params.limit))
   if (params.filter) search.set('filter', params.filter)
+  if (params.sortBy) search.set('sort_by', params.sortBy)
+  if (params.sortMissingFallback !== undefined) search.set('sort_missing_fallback', String(params.sortMissingFallback))
   return getJson(`/api/logs?${search.toString()}`)
 }