add deep-links for "" (base), new-activity, and QR-scan pages

doc/DEEP_LINKS.md

@@ -125,6 +125,12 @@ view: "details"
 
 All deep links follow the format: `timesafari://<route>/<param>?<query>`
 
+### App Routes
+
+- `timesafari://` — no route at all opens the app at the home feed.
+- `timesafari://account`
+- `timesafari://new-activity`
+
 ### Claim Routes
 
 - `timesafari://claim/:id`
@@ -143,6 +149,17 @@ All deep links follow the format: `timesafari://<route>/<param>?<query>`
 - `timesafari://contact-import/:jwt`
   - Query params:
     - `contacts`: JSON array of contacts
+- `timesafari://contact-qr` and `timesafari://contact-qr-scan-full`
+
+  Both open the page that displays your contact QR code, scans someone else's,
+  and prompts you to set your name if your identity does not carry one. The
+  destination view is chosen by platform, not by which of the two paths was
+  used: a full-screen camera view where a native scanner is available, an
+  ordinary page where the in-page web reader is used.
+
+  Prefer `contact-qr` when publishing a link. The same path is appended to the
+  web address by `/deep-link/<path>`, and `/contact-qr` is the web route that
+  serves this page in a browser.
 
 ### Project Routes