docs: reconcile the backlog, close 98/100/102, drop 78 and 116

The reconciliation against the user's own notes found ZERO unrecorded
entries, the first clean pass: the 2026-08-16 sweep added items 98 to 104 and
those absorbed the whole current "Not done yet" list.

Closed this session, sections moved to the closed-items file: 98, 100, 102.

Dropped:
- 78, at the user's request. Never a defect. Items 85, 23 and 81 already give
  the whole journey (right-click a value, search it, save the query, make a
  rule from it); this was only a shortcut across it, and the entry had already
  said to gather usage evidence first. That evidence never appeared.
- 116, the same day it was raised, and its section is kept for the process
  failure rather than the non-bug. Copy image was reported as copying markup
  instead of pixels. Two explanations were eliminated by real evidence, and
  the conclusion drawn was that something more interesting must be wrong; the
  actual answer was that the measurement distinguishing them was broken. A
  wl-paste reading taken minutes after the copy showed text flavours only, was
  explicitly labelled unreliable in the entry, and was then reasoned from
  anyway. Run immediately after a copy it reports image/png and 30 more, and
  pasting into GIMP immediately works. A caveat that does not stop the
  reasoning it qualifies is decoration.

Opened:
- 112, Toggle unread on a whole thread cannot reach "all unread" on a
  partly-read thread. The direction comes from notmuch's UNION over the
  thread, so one unread message anywhere makes the action pick "mark read" and
  no input reaches the other branch. Third defect from that union after 110.
- 113, view source as our own plain-text dialog.
- 114, Save image is offered and does nothing: no downloadRequested handler
  exists anywhere. The user corrected the first proposal, which would have
  refused remote images on security grounds; once remote content is granted
  the bytes are already fetched, so saving them is a local copy and blocking
  it protects nothing.
- 115, no confirmation when a copy succeeds.
- 117, the pane offers no Select all. NOT caused by item 100: verified against
  a build with that filter reverted. Three wrong theories preceded that
  measurement, and the lesson is one item 100 had already written down: a menu
  built by hand proves nothing about the menu Chromium builds.

The changelog's Unreleased section gains Important-as-a-toggle, the rules
Note column, the menu fix, and two Upgrading notes.

0 files changed, 0 insertions, 0 deletions