Keep a pasted note whole, and search the notes from the app

Two things found by using this on real notes.

**The paste.** Copying out of Apple Notes put most of the note on the
floor. WebKit wraps a copied selection in a single span carrying the
computed style of everything in it — `font-weight: 700` included — with
the real blocks nested inside. The serializer read that span as inline,
so every line collapsed into one paragraph and every word came out bold;
switching to the Markdown view then showed what little had survived,
which is what "most of the text was gone" was. And because the boldness
came from a foreign span's style rather than a tag, the bold button
could not remove it.

The rule now is that an element holding blocks is a block whatever its
tag, and that a container's style is not emphasis — only a span wrapping
a single run of text is. A paste this editor cannot read at all (some
engines withhold the clipboard from the event) is tidied afterwards
instead, but only if something actually arrived, so an empty paste still
costs nothing.

**The search.** A Suche tab over the user's own notes, reading the files
rather than the index: notes reach the index only on a full crawl, so a
lesson written this morning would not be findable this morning, which is
most of what anyone searches their own notes for. A result names the
lesson it matched in, not the day, for the same reason the index indexes
day notes per section. Tapping one opens that day in the editor.

Driven in Firefox against the real app with a proxied session: the
paste, six switches between the two views, bold and unbold on pasted
text, the search, and opening a result. 386 unit tests, 114/115 smoke.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

README.md

@@ -86,6 +86,10 @@ teachers, rooms, cancellations dropped and substitutions marked. Each heading is
 indexed as its own lesson, so a search answers "my own note, Deutsch,
 18.09.2026" rather than "Friday".
 
+A **Suche** tab searches your own notes straight from the files — no crawl in
+between, so a lesson written this morning is findable this morning — and a
+result names the lesson it matched in rather than the day.
+
 Writing is **formatted, not Markdown**: headings, bold, lists, tick boxes,
 quotes, links and tables come from a toolbar, and `MD` shows the Markdown
 underneath when you want it. The file on disk stays Markdown either way — that