fix: show every note on a verse, not just the first (#114)

[kbennett2000]

Fixes #114.

What landed

A verse with two or more notes (e.g. Joshua 1:1–2) showed the same single marker as a one-note verse, and clicking it opened only the first note — the rest were invisible and unreachable. This was a frontend display gap: the backend already returns every annotation covering a verse in annotations[].

The fix mirrors the existing sermon-notes pattern already in the codebase (count badge + single/list popover split):

• New AnnotationsPopover — a read-only list of every annotation on a verse, modeled on SermonNotesPopover, reusing AnnotationPopover's row body (verbatim Markdown — invariant 6, the out-of-scope line, tags). Takes an optional onOpen: when present, each row gets an "Open →" button (reader); when absent, each row deep-links back to the reader (compare).
• Reader — ●/○ markers gain a count badge when >1. A single note still opens the editor directly (unchanged); multiple open the list popover, and a row's "Open" hands that note to the existing openExisting editor.
• Compare — one note keeps the single AnnotationPopover; several use the new list popover. Count badge added.

No backend, schema, or read.py changes — the data was already correct, so invariant 4 (canonical-coordinate bridge) is untouched.

Open-question answers

• Reader UX for multiple notes: keep single-note behavior direct-to-editor; only multiple notes get the badge + list popover. (Chosen to minimize blast radius on existing single-note flow and tests.)
• Out-of-scope marker tooltip: now de-duplicates scope translations across all stacked notes.

How it was verified

• Unit/integration: new AnnotationsPopover.test.tsx, plus multi-note + preserved-single-note cases added to ReaderView.test.tsx and CompareView.test.tsx. Full suite green: 231 tests pass. ESLint + TS-strict clean.
• End-to-end against a live Concord (192.168.1.62:8000): ran songbird's backend pointed at it, registered, created two notes on JOS 1:1 (one a 1:1–2 range), then GET /api/v1/read/BSB/JOS/1 returned v1 → 2 annotations [1,2], v2 → 1 [2], v3 → 0 — the exact annotations[] shape the frontend renders the badge + list against.

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