* fix(app): count chat Find matches across the whole chat
Chat Find searched the whole chat but its counter read "1 of N in
message", where N was the occurrences inside the selected message. The
per-message split is an implementation detail of how the client verifies
and highlights a hit; a reader counting matches is counting the scope
they searched. The counter now reads "3 of 7" for the position across
every message that holds a hit, and Next/Previous walk that sequence,
crossing message boundaries and wrapping at the ends. Per-message
occurrence stays inside the model as navigation state.
The total needs a per-message count for messages that are not on screen,
so the daemon now reports one. It counts with the same matcher the
browser uses on rendered text — query words joined by any whitespace,
case-insensitive, never across a Markdown block boundary — which also
stops it from reporting locations the client would reject. The client
replaces the estimate with the rendered count as each message is
revealed, so the total is exact for everything that has been on screen.
`count` is optional on the wire and tagged COMPAT(timelineSearchCount):
a host that omits it is worth one match per located message until a
reveal corrects it.
* fix(server): stop chat search reporting matches the browser cannot show
Falling back to the whole Markdown source when the per-block scan found
nothing reported a match whenever the query words straddled a block
boundary — "one target" across "target one\n\ntarget two" — and on
syntax the reader never sees. The client always rejected those
locations, so before the whole-chat counter the cost was a wasted round
trip. Now that the total sums the host's per-message counts, a rejected
location inflates the number the reader sees until navigation reaches
that message and drops it. The block scan alone is the whole rule.
The model's Location derives from the wire type again, with count
narrowed to required: the search boundary fills in the COMPAT default,
so the interior never re-checks it.