Only the first analysis language's glosses are ever visible

A project with several analysis languages renders glosses in analysisLanguages[0] only. Every
other language's glosses are stored but unreachable, and there is no UI to switch the displayed
language.

The store's language is a mount-time seed, taken from the first tag in the list:

• src/components/InterlinearizerLoader.tsx:299 — draft view: draft?.analysisLanguages[0] ?? platformLanguage
• src/components/InterlinearizerLoader.tsx:1135 — PT9 import view: activeProject.analysisLanguages[0] ?? platformLanguage

Those are the only two writers of analysisLanguage in the app. Everything downstream reads that
one tag — selectPhraseGloss / selectSegmentFreeTranslation (src/store/analysisSlice.ts:1184,
:1199), the gloss writes, and the analysis catalog rows — so a gloss map holding {en, fr, tpi}
renders en and nothing else.

Why now

Latent since the New dialog started accepting a comma-separated list, but until the Paratext 9
import there was always a user who typed the order and knew what they'd get. The import derives the
list from the source files — first appearance of glossLanguage in data.books, deduped first-wins
(src/converters/pt9/convertPt9Project.ts:82-104, :158-161) — so [0] is whatever the
platformScripture.Pt9Interlinear provider enumerated first. It also tells the user the hidden data
exists: the import report lists every language it converted
(src/components/modals/Pt9ImportModal.tsx:199-206), so the view visibly contradicts the report.
Copying out doesn't help either — createEditableCopy carries analysisLanguages verbatim
(src/services/projectStorage.ts:550).

Observed on a real multi-language PT9 project (PIA); it will affect any source with more than one
gloss language.

Scope

Two decisions, worth settling before implementation:

1. Where the language selector lives — the view-options dropdown, the toolbar, or per-project
   state that persists. Add a user-questions.md entry for this.
2. Whether the import view gets the same control as the draft view. The import is read-only, but
   switching the displayed language is a read, not an edit, so it should.

Implementation note: analysisLanguage is a non-reactive seed on AnalysisStoreProvider. Changing
it needs the tag folded into the provider key (src/components/InterlinearizerLoader.tsx:1133,
:1153) so the store remounts, or a reactive path into analysisSlice. Note that remounting drops
in-flight gloss edits and the catalog's scroll position, so the reactive path is probably the right
one.

Start with the two analysisLanguage seeds in src/components/InterlinearizerLoader.tsx and the selectors and writes in src/store/analysisSlice.ts. Review the import language derivation in src/converters/pt9/convertPt9Project.ts and resolve the selector location and import-view behavior in user-questions.md. Done means every analysis language can be selected and its stored glosses are displayed in both relevant views without losing edits.