Feature: Call transcript export

[lucksus]

Summary

A recorded call can now be taken out of the space as a plain text file — one line per utterance,
Name, ISO timestamp: text — from a download button on the call's card.

Offered to everyone rather than gated on authorship, on the same reasoning as rejoining a call: it
reads the shared record and writes to the reader's own device, so there is no one else's account
being edited the way there is with the edit and delete beside it.

Changes

• spaceStore.exportCallTranscript(callId) — gathers the call's turns through the existing
  gatherTranscriptTurns helper rather than reading the children again, so what counts as a turn
  (which rows are dropped, and the order they end up in) is decided in one place and the exported
  file agrees with what extraction feeds the model. Names every speaker: the profile cache is
  populated as a side effect of rendering people, so the transcript's speakers are fetched first,
  or anyone not currently on screen would export as a raw DID. The file is named after the call and
  stamped with the export time, so successive exports don't overwrite each other.
• A download button on each call card (CallsList.ts), beside the extract control.
• The store surface is registered in templateSurface.ts (a content action) and in
  ai-context/src/fragments/stores.ts, with the generated context outputs regenerated — CI diffs
  those, so the fragment alone would have failed it.
• Icon collection widened (3-primitives/scripts/collect-icons.ts). The scan globs never
  covered packages/templates/** or packages/module-system/**, so an icon named by a built-in
  template was absent from the bundle and fell through to the jsdelivr CDN — fine in development,
  blank on a desktop build with no connection. This affected the new download icon and the
  sparkle already sitting next to it. The bundle goes from 40 icons to 103.
• Removed packages/app-shell/diag.tmp.ts, a debug script committed to dev by accident in
  ad1b569e. Unrelated to this feature, but it was one line away from the code being changed here.

Docs kept in sync

• Store surface changed → ai-context/src/fragments/stores.ts updated and context regenerated (pnpm --filter @we/ai-context generate-context; CI diffs the outputs)
• Architecture/layering changed → docs/architecture/codebase-map.md (and its sync partner ai-context/src/fragments/architecture.ts)
• Seed shape changed → packages/app-shell/src/types/seed.ts comments + docs/getting-started/seed-system.md + seed-examples/
• A package's public surface changed → that package's README/CONVENTIONS
• N/A — no doc-bearing surface touched

Test plan

• pnpm --filter @we/app-shell typecheck — clean
• pnpm --filter @we/app-shell test — 429 passed
• pnpm --filter @we/primitives test — 98 passed (icon bundle regenerates: 103 icons, 0 missing)
• pnpm validate:schemas — 28 schemas, no issues
• pnpm --filter @we/ai-context generate-context — no further diff, so the CI docs check is clean
• Manual: exported a transcript from a recorded call and opened the file — TODO, confirm before merge

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