feat(pass): upgrade search with field weighting and match quality

[Themistoklis]

Description

Replaced the Boolean item search with a weighted relevance score, so the item you actually meant ranks first instead of every item that merely contains the term.

Each match scores as $fieldWeight * matchQuality$:
Field weight (which field matched): title > primary (login email/username, alias address, cardholder name) > url > everything else (notes, content & extra fields). The title sits far above the rest, so a title match always wins. Fixes, e.g., searching for protonmail surfacing every account using a protonmail address before the one named Protonmail.

Match quality (where the needle lands): exact > prefix > word-prefix > substring.

Results sort by score, and ties fall back to the selected sort drop-down (recent, title, …). Match semantics unchanged (every needle must match at least one field).

[D-Bao]

Thanks for the PR!
Some UX issues/suggestions:
With this, the search results will no longer respect the sort order so users won't be able to sort the results by date etc, and the search will no longer be consistent with our mobile apps. Instead, could you scope this search upgrade to only apply when a new Relevant sort option is selected in the dropdown below? It can be selected by default:

And then the date sections "Today", "Last month" etc can be hidden when a Relevant search is selected, similar to how selecting "Alphabetical" will remove those date labels.

[Themistoklis]

@D-Bao thanks for the feedback.

I addressed it all in the latest push.

• Added a new Relevant sort option in the dropdown, set as the default. The relevance ranking now only applies when Relevant is selected;
• Date sections ("Today", "Last month", …) are now hidden during a Relevant search, same as Alphabetical. While browsing with no search term, Relevant falls back to recency, so the date sections still show.