DMs: file messages keep their key across reloads, tabs no longer erase each other's cached messages, one-time re-open of the last two weeks of wraps

The DM cache kept only text, so a kind-15 picture (an encrypted Blossom
blob) came back after a reload as a bare link with no key. Every tab also
rewrote the whole cache from its own memory, so a tab asleep since
yesterday erased messages another tab had received, while the wrap log
still marked them opened: those messages were never fetched again (a
phone showed 2 of 4). Rows now carry kind 15's tags and merge by id with
what's stored; the wrap log merges too. A one-time pass re-opens wraps
from the last 14 days so damaged caches heal.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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