Bypass the threaded EvJobFind for EPUB documents and use WebKit's
WebKitFindController directly. The threaded find job was incompatible
with GepubDoc's single-threaded design and caused segfaults. The new
approach searches within the current page using WebKit's built-in text
search and highlighting, which is both simpler and thread-safe.

Assisted-by: OpenCode:claude-opus-4-6

Adds a new --reset-metadata command-line option that clears all stored
metadata (page position, zoom level, window geometry, etc.) for
specified document files before opening them. This allows users to open
documents with a fresh state, ignoring any previously remembered
settings.

The sidebar settings were ignored when opening documents on systems
without GVFS metadata support.

Now when metadata is not available, we use whatever is in gsettings, and
when metadata is available, we respect the per-document state.

Fixes #163

Underline icon is used for squiggly annotations in the sidebar.

Backported from https://gitlab.gnome.org/GNOME/evince/-/commit/9f790bed

Backported from https://gitlab.gnome.org/GNOME/evince/-/commit/4bd88ed0

Backported from https://gitlab.gnome.org/GNOME/evince/-/commit/9b71d67e

Backported from https://gitlab.gnome.org/GNOME/evince/-/commit/18595cc3

When spawning a new atril instance for cross-document links, the
destination and search parameters from the document were interpolated
directly into the command line without shell quoting. Values containing
spaces or special characters could be split into separate arguments by
the shell parser, potentially being interpreted as unintended flags by
the child process.

Apply shell quoting to page label, named destination, and search string
values before appending them to the command line, consistent with how
other spawn sites in the codebase already handle this.

Cairo surfaces have a limit of 32767px in any dimension, so we make sure
that we don't end up zooming in past the point where the rendered
surface is larger than that limit.