Ngram UI fixes, URL normalisation unit tests and dependency upgrades

[jorntx]

Ngram UI fixes, URL normalisation tests and dependency upgrades

This PR collects a set of bug fixes, dependency upgrades, and test additions accumulated since the last upstream merge.

---

Bug fixes

Ngram chart / search box

Several interconnected bugs were present in the ngram search UI. They are fixed in this PR:

• About text re-appearing on query clear — the about/intro text was being shown again whenever the user manually deleted the text from the ngram search box, because the clear action was not being distinguished from a genuine "empty query" state. Fixed by tracking the clear action explicitly.
• Chart not clearing on search-box clear — invoking the clear function in the search box left the previous chart visible. A dedicated clearChart function is now called to tear down the existing chart instance when the query is cleared.
• Click on data point did not trigger a search — clicking a point on the ngram line chart was supposed to deep-link into a filtered search, but the handler was silently failing. The bug is now resolved so clicking a data point correctly initiates the search.
• Layout shift / bounce during searches — the search box was shifting position while a search was in flight, causing a noticeable layout jump. The layout is now stable throughout the search lifecycle.
• TypeError: undefined is not an object during ngram searches — a missing null-guard caused a hard crash under certain search conditions. Fixed with a defensive check before accessing the relevant object.
• TypeError: undefined is not an object when exporting chart data — the CSV export logic was referencing a Vue 2-era data shape that no longer exists. The export mixin has been refactored to read directly from ngramStore datasets and labels, removing the stale legacy code path.
• Chart sizing and incomplete options — the ngram chart was rendering at the wrong size, and only a partial options object was being passed to the chart engine. Both the sizing CSS and the options wiring are now corrected so the full configuration is applied on every render.

---

Dependencies

Security/maintenance upgrades to keep the build toolchain current:

Package	Old	New
solr (backend)	9.6.0	9.10.1
vite (frontend)	6.3.5	^6.4.2
vitest (frontend)	3.1.3	^3.2.6

Both vite and vitest bumps address known CVEs in the prior versions.

---

Tests

New and improved test coverage for the URL normalisation layer:

• NormalisationStandard.canonicaliseURL — expanded unit tests covering the canonical URL construction logic.
• PathResolver.waybackAPIResolverHelper — new test class (PathResolverWaybackAPIResolverTest) with broad coverage of the wayback API resolver helper, including port-stripping behaviour introduced in this PR.
• UrlUtils url_norm query building — tests for url_norm query construction, including default-port handling (port 80 stripping) to prevent regressions on the fix above.

---

Files changed: 16 files, +503 / −88 lines
Affected areas: ngram frontend components, CSV export mixin, Solr client, test suite

[jesperlauridsen]

A quick look over the code gave me no worries. I haven't spun it up to check it - but it looks solid enough, imho.

@thomasegense, if we need to test it, can we put it on a devel instance somwhere?

[thomasegense]

I have tested it.

[thomasegense]

It is working.
Nice changelog details.