feat: per-row icon actions for sites and links sidebar (#803)

[wilhel1812]

Summary

• Sites list rows: removed ASL elevation display; added pencil (edit) and circle-minus (remove) icon buttons aligned to the right of each row
• Links list rows: added matching pencil and circle-minus icon buttons per row
• Sites panel chip-group: added "New" button (opens library add-form); removed bottom Edit and Remove buttons
• Links panel chip-group: removed bottom Edit and Remove buttons; "New" button remains
• In read-only mode: icon buttons are hidden; no chip changes needed

Refactors

• openLibraryForSelectedSite → openLibraryForSite(site: Site) — now takes a site directly so it can be called from any row
• openEditLinkModal() → openEditLinkModal(linkId?: string) — resolves link internally to avoid React state timing issues when called per-row

Test plan

• Site rows show name only (no ASL), pencil + circle-minus icon buttons visible
• Pencil on site opens library/edit form scoped to that site
• Circle-minus on site triggers remove confirmation; disabled when only 1 site remains
• Link rows show title, pencil + circle-minus icon buttons visible
• Pencil on link opens edit modal pre-filled for that link
• Circle-minus on link triggers delete confirmation
• Sites chip-group: New, Library, Insert newest — no Edit/Remove
• Links chip-group: New only — no Edit/Remove
• All read-only: no icon buttons on rows, no New chip
• npm test passes (454 tests)
• npm run build passes

Closes #803

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