docs(diagrams): review + fix all .puml files; touch all to trigger render

seq-auth:
- startAutoRefresh() -> startSSE(), stopAutoRefresh() -> stopSSE()
- Cookie secure flag: 'secure (prod)' -> 'secure (if TRUST_PROXY)'

component:
- Fix typo creatApp -> createApp
- Add GET /csrf, POST /logout to browser->auth arrow
- Add GET /stream (SSE) to browser->dashboard arrow

class-server:
- Add subscribers Set, onPollComplete(), offPollComplete() to Poller class

class-data:
- Add SSE Event /stream shape alongside API Response /user-downloads
- Add sser *-- dl relationship

state-ui:
- Fix invalid multi-line transition labels with raw Unicode arrows
  (broke PlantUML parser); replace with valid \n escapes on single line

seq-dashboard, seq-polling, state-poller, activity-matching:
- Whitespace touch to trigger render-diagrams CI workflow

docs/diagrams/seq-dashboard.puml

@@ -2,6 +2,7 @@
 !theme plain
 title sofarr — Dashboard SSE Stream Sequence
 
+
 actor User as user
 participant "Browser\n(app.js)" as browser
 participant "Express\n/api/dashboard" as dashboard