Configurable recap templates (categories per meeting type, in Settings)

Takeaways categories are no longer hardcoded — they're editable templates. A
template = the always-on TLDR + an ordered list of sections, each with a title, a
type (attributed items / bulleted list / paragraph), and an instruction (the prompt
text for that category). The analyzer assembles the LLM prompt FROM the template
and parses generically, so adding/removing/renaming a category needs zero code and
the output always renders.

- RecapTemplate / TemplateSection / SectionKind + TopicGranularity; built-in
  defaults (Internal Meeting, 1:1, Company/Sales Call), all editable.
- Generic extras: RecapExtras{tldr, primarySpeakers, sections:[RenderedSection]} +
  RecapItem{text,who,when,note} replaces the fixed MeetingExtras. Analyzer builds
  per-section sec_N fields + parses by kind; renderer + remap are generic.
- Topic granularity (coarse/auto/fine) answers 'should chunking be configurable' —
  it scales the target topic count; raw window sizes stay as tuned defaults.
- AppSettings persists templates + defaultTemplateId (seeded once). Settings gets a
  default-template picker + 'Manage…' → TemplatesView (CRUD, edit sections/
  instructions, set default, **Preview prompt** for full transparency).
- Recap editor gains a template picker; Regenerate uses the chosen template. Auto
  recap uses the default template.

54/54 XCTest (template prompt build, generic parse/remap/render updated).

Ten31Transcripts/UI/SettingsView.swift

@@ -26,7 +26,13 @@ struct SettingsView: View {
                     .textFieldStyle(.roundedBorder)
                 Toggle("Auto-send recordings to backend", isOn: $settings.autoSendOnStop)
                 Toggle("Build readable recap (topics + highlights)", isOn: $settings.recapEnabled)
-                Text("Your name labels your mic channel. Auto-send transcribes on stop; the recap writes transcript.md + recap.html.")
+                HStack {
+                    Picker("Default recap template", selection: $settings.defaultTemplateId) {
+                        ForEach(settings.recapTemplates) { Text($0.name).tag($0.id) }
+                    }
+                    Button("Manage…") { TemplatesWindow.shared.show(settings: settings) }
+                }
+                Text("Your name labels your mic channel. Auto-send transcribes on stop; the recap writes transcript.md + recap.html. Templates define the takeaways categories per meeting type.")
                     .font(.caption)
                     .foregroundStyle(.secondary)
             }