fix: include all speakers in generated list

[wildtigress]

Fixes an issue where speakers without sessions were omitted from the generated site. This change: \n- Always includes every speaker in foldBySpeakers (even if they have no sessions)\n- Resets the thumbnail variable per speaker to avoid thumbnail carry-over\n\nFiles changed: src/backend/fold_v1.js, src/backend/fold_v2.js.\n\nSmoke test confirmed speakers without sessions are included.\n\nIf you'd like, I can also add a small test or sample generation steps.

Summary by Sourcery

Include all speakers in foldBySpeakers output and reset thumbnail per speaker to avoid carry-over.

Bug Fixes:

• Always include speakers without sessions in the generated list
• Reset per-speaker thumbnail variable to prevent carry-over

[sourcery-ai]

Reviewer's Guide

This PR fixes speaker omission by unconditionally including every speaker in the foldBySpeakers output and prevents thumbnail value carry-over by resetting the thumbnail variable at the start of each speaker iteration, applied consistently across both v1 and v2 folding implementations.

Class diagram for updated speaker object in foldBySpeakers

classDiagram
  class Speaker {
    country: string
    featured: boolean
    email: string
    facebook: string
    github: string
    linkedin: string
    twitter: string
    website: string
    long_biography: string
    mobile: string
    name: string
    thumb: string
    photo: string
    organisation: string
    position: string
    sessions: Session[]
    speaker_id: string
    nameIdSlug: string
  }
  class Session {
    // Session attributes (not modified in this PR)
  }
  Speaker "1" -- "*" Session: has

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File-Level Changes

Change	Details	Files
Reset thumbnail per speaker to avoid carry-over	Insert thumb = '' at the beginning of each speaker loop Ensure previous speaker’s thumbnail isn’t reused	src/backend/fold_v1.js src/backend/fold_v2.js
Always include all speakers regardless of session count	Remove the if(allSessions.length) conditional Unconditionally push speaker objects into speakerslist	src/backend/fold_v1.js src/backend/fold_v2.js

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