Modify inverted colors preference to fall back to GSettings when no
per-document metadata exists. This allows users to set inverted colors
as the default preference, which will apply to all documents that don't
have an explicit per-document preference.

Fixes #710

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

When enabled links are not allowed to change the current zoom mode and
level.

Fixes #712

Backported from https://gitlab.gnome.org/GNOME/evince/-/commit/5d8ef0fa

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