Store cookie durations as max_age_seconds

Replace the free-form duration TEXT column with a nullable
max_age_seconds INTEGER on both cookies and cookie_patterns
tables. The SDK detector now sends raw seconds instead of
humanized strings, eliminating locale-dependent comparisons
in the pattern merge worker. Humanization happens at display
time in the widget and console UI.

Signed-off-by: Émile Ré <emile@getprobo.com>

pkg/coredata/migrations/20260429T135250Z.sql

@@ -0,0 +1,19 @@
+-- Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
+--
+-- Permission to use, copy, modify, and/or distribute this software for any
+-- purpose with or without fee is hereby granted, provided that the above
+-- copyright notice and this permission notice appear in all copies.
+--
+-- THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+-- REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+-- AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+-- INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+-- LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+-- OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+-- PERFORMANCE OF THIS SOFTWARE.
+
+ALTER TABLE cookies DROP COLUMN duration;
+ALTER TABLE cookies ADD COLUMN max_age_seconds INTEGER;
+
+ALTER TABLE cookie_patterns DROP COLUMN duration;
+ALTER TABLE cookie_patterns ADD COLUMN max_age_seconds INTEGER;