Prepare time-bound Setup URI integration for Commonlib release

Add Time-bound and Compatible generation to the Obsidian dialogue, browser peer check, and setup tools, with boundary and compatibility coverage. Show the fixed window end before sharing a Time-bound URI.

This review branch depends on unpublished @vrtmrz/livesync-commonlib 0.1.32-next.0. The root npm pin and Deno lockfile remain unchanged until that candidate is available; a fresh install of this commit is not yet expected to build.

utils/readme.md

@@ -45,6 +45,8 @@ deno run --minimum-dependency-age=0 --config=./flyio/deno.jsonc --frozen --lock=
 
 If `uri_passphrase` is omitted, the tool generates and prints a cryptographically random one. Store the Setup URI and its passphrase separately. The `passphrase` value protects synchronised Vault data and must also be stored safely.
 
+The generator defaults to `uri_mode=ephemeral`. The URI opens only during the current fixed seven-day UTC window, and the tool prints its exact end time. It may have less than seven days remaining when generated. For an indefinitely reusable URI, set `uri_mode=persistent` before running the command. Persistent uses the existing encrypted format, which older clients that already support that format can read. The time condition controls opening the URI; it does not revoke settings or credentials after import.
+
 ### Object Storage
 
 ```sh