PLAN.md: add missing status icons, fix stale phase cross-reference

Formatting-only pass, no information changed:
- Added missing checkmarks to Phase 7 and Phase 9 headers (were plain
  'DONE' text while every other completed phase uses '✅ DONE').
- Added a status icon to the un-numbered SIM868 cellular fallback
  section ('⚠️ built, UNTESTED').
- Added a consistent '🚧 PLANNED' icon to Phases 12-17, which had no
  status icon at all.
- Fixed a stale cross-reference in the Phase 6 update ('see Phase 9
  update below' -> 'see Phase 11 update below' - the phone-relay
  content it points to has always lived under Phase 11).

Co-authored-by: Copilot <[email protected]>

PLAN.md

@@ -237,7 +237,7 @@ HTTP 200 with no port number from another machine on the network. (Real hotspot
 the Pi's LAN IP are intentionally not recorded in this file — see local, non-committed notes.)
 
 **Update — real-hardware bug found + fixed (hotspot->home reconnect was flaky)**: while testing
-the phone-relay feature live (see Phase 9 update below), `yaris-netwatch` repeatedly logged "home
+the phone-relay feature live (see Phase 11 update below), `yaris-netwatch` repeatedly logged "home
 WiFi not found" 4 times in a row over ~13 minutes while sitting right next to the router — a real
 regression from the original design, not a one-off fluke. Root cause: a plain `nmcli con up
 home-wifi` straight out of AP mode relies on NM's scan cache for `wlan0`, which is stale/empty
@@ -250,7 +250,7 @@ take up to ~80s, default systemd 90s start timeout was too tight). Verified fixe
 both hotspot->home transitions after the fix recovered in ~7 seconds (previously failing outright).
 Deployed: `sudo cp deploy/yaris-netwatch.sh /usr/local/bin/... && cp .service ... && daemon-reload`.
 
-### Phase 7: app_db.py / app_sql.py fixes — DONE
+### Phase 7: app_db.py / app_sql.py fixes — ✅ DONE
 Neither file was called from `app.py` or anywhere else - orphaned from a prior iteration. Fixed:
 - `app_db.py`: applied a prior-session stash fix - resolves `.env` path via `__file__` (was
   cwd-relative), fixes `os.getenv()` calls to pass the actual key names (was called with zero
@@ -333,7 +333,7 @@ cleanly after being interrupted once by the OOM crash below - `copy_files()`'s s
 copied logic meant re-running `/api/dash/import` just picked up the remaining files, no data loss
 or re-copy of the first 19 files). SD card unmounted cleanly afterward.
 
-### Phase 9: Remote server for itinerary/dashcam upload — DONE
+### Phase 9: Remote server for itinerary/dashcam upload — ✅ DONE
 Per architecture decisions #4 and #5: self-hosted server/API to receive itinerary (from the
 SQLite pipeline) and dashcam file uploads.
 
@@ -449,7 +449,7 @@ the user (e.g. a data-blocking USB cable/adapter, or plugging/unplugging appropr
 before recording vs. before importing. Worth revisiting if it becomes tedious in daily use (e.g. a
 Pi-controlled USB data-line switch), but out of scope for now.
 
-### SIM868 cellular fallback for tracking uploads — built, UNTESTED (no SIM card available)
+### SIM868 cellular fallback for tracking uploads — ⚠️ built, UNTESTED (no SIM card available)
 `modules/app_cellular.py` gives the tracking-upload path a fallback over the SIM868's cellular
 data connection when WiFi/Ethernet is unreachable. Design notes:
 - Uses the SIM868's built-in AT-command HTTP(S) client (`AT+HTTPINIT`/`HTTPPARA`/`HTTPACTION`/
@@ -643,7 +643,7 @@ workaround currently in place for that specific case.
 **Side-fix from this test session**: found and fixed a real, unrelated bug in `yaris-netwatch.sh`
 during this same test — see the Phase 6 update above.
 
-### Phase 12: Remove phone-relay feature — PLANNED
+### Phase 12: Remove phone-relay feature — 🚧 PLANNED
 Undo Phase 11 cleanly given the Phase 11 update above (fundamental browser platform limitation,
 not fixable). Remove:
 - `app.py`: `/api/dash/pending`, `/api/dash/file/<path>`, `/api/dash/relay/config`,
@@ -661,7 +661,7 @@ not fixable). Remove:
   avoid rehashing its 20GB+ backlog every loop), `DASHCAM_CHUNK_SIZE`/Cloudflare 100MB
   workaround - none of that is relay-specific.
 
-### Phase 13: Dashcam USB file browser (list + delete) — PLANNED
+### Phase 13: Dashcam USB file browser (list + delete) — 🚧 PLANNED
 Replace the current all-or-nothing "Import videos" flow's blind spot (no visibility into what's
 actually on the camera) with a real file browser for the mounted USB dashcam device:
 - New endpoint(s) in `modules/app_dash.py` to list every video file on the mounted dashcam
@@ -680,7 +680,7 @@ actually on the camera) with a real file browser for the mounted USB dashcam dev
   select-mode/data-communication toggle behavior - the user replugs power manually to return the
   camera to recording mode, as they already do.
 
-### Phase 14: Local imported-video browser + player — PLANNED
+### Phase 14: Local imported-video browser + player — 🚧 PLANNED
 Same file-browser treatment for videos already imported to the Pi's own disk
 (`dash/videos/`, populated by `import_dashcam()`):
 - List endpoint (reuses `find_video_files()` against `app_dash.DEFAULT_DESTINATION`) showing
@@ -699,7 +699,7 @@ Same file-browser treatment for videos already imported to the Pi's own disk
   "Play" action that opens the video inline, and a delete button per row with a confirmation
   prompt.
 
-### Phase 15: OBD real-hardware readiness (code hardening) — PLANNED
+### Phase 15: OBD real-hardware readiness (code hardening) — 🚧 PLANNED
 Nothing has been installed or tested in the actual 2013 Yaris yet - `modules/app_obd.py` has
 only ever been tested standalone on the Pi with nothing plugged into the OBD-II port (correctly
 reports "no connection to car"). Per explicit user decision, this phase is **code hardening
@@ -739,7 +739,7 @@ all in `modules/app_obd.py` / `modules/app_events.py`:
   (falls under "code hardening only" for now - add the query with graceful "unsupported" handling
   rather than assuming it will work).
 
-### Phase 16: Complete web UI redesign — PLANNED
+### Phase 16: Complete web UI redesign — 🚧 PLANNED
 The current `templates/`/`static/` UI is an old, mostly-unmodified admin dashboard template
 (SB Admin 2-style Bootstrap theme) with leftover placeholder cruft never replaced with real
 content - e.g. `index.html`'s "Placeholder button", dropdown menus full of "Action" / "Another
@@ -757,7 +757,7 @@ keep bolting new cards onto the old template:
   the redesign is done once against the final feature set rather than repeatedly against a moving
   target.
 
-### Phase 17: Native Android companion app — PLANNED (low priority, do last)
+### Phase 17: Native Android companion app — 🚧 PLANNED (low priority, do last)
 Revives the phone-relay goal (Phase 11/12) properly this time, using a real native app instead of
 a web page - the only way to actually hold a WiFi connection to the Pi's hotspot and a cellular
 connection to the internet open simultaneously (`ConnectivityManager.bindProcessToNetwork()`,