Add the Paratext 9 import WebView experience with a first-open offer

[jasonleenaylor]

The UI half of the PT9 import, stacked on #273 (converter: #272).

• The select modal gains the Import from Paratext 9 button, shown only when
  the source serves convertible data (usePt9ImportAvailability probes the
  manifest through the projectInterface).
• Pt9ImportModal carries the run, its report, and its failures - including
  the too-large refusal, recognized by the RESOURCE_EXHAUSTED platform error
  code with the documented message marker as fallback (pt9-import-error).
• An import opens read-only: editing affordances stay away, the banner
  carries manual sync and copy-to-editable, and CopyToEditableModal clones an
  import into an editable project through the normal draft-open flow.
• First-open offer: opening a source that has convertible PT9 data and no
  stored interlinearizer state asks "This project has Paratext 9 interlinear
  data. Would you like to convert it now?" Yes runs the import as the only
  project created; No (or dismissing) persists the empty draft so the offer
  never repeats. Recorded in user-questions.md for outside review.

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[coderabbitai]

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[imnasnainaec]

❓ report.senses.{entryRefs,senseRefs}{Resolved,Unresolved} is write-only: foldReport doesn't fold it and nothing else reads it. Since no resolver ever runs today, it's 0 resolved / all unresolved on every import. Just checking: is that deliberate (rather than a gap in the fold)?

[jasonleenaylor]

Deliberate. No resolver runs during import yet, so folding the sense counters would show zero resolved and everything unresolved on every run, which reads as a failure for work that is not wired up. The counters are populated and pinned on the converter side so they are ready when a resolver lands. Folding and rendering them belongs with the resolver work tracked in #280, which now lists it as a scope point; ReportTotals carries a TODO pointing there (ccb28ea).

--drafted by Claude--