docs+ci: pre-merge polish — README, doc accuracy, workflow

README:
- Fix typo "offical" → "official"
- File names in Firmware Variants table now match workflow output
  (solo-<version>-oled.uf2 / solo-<version>-eink.uf2)
- Un-comment the E-ink Display section (now fully supported)
- Clock Screen: "sensor values" → "data fields" (covers Batt%, Nodes, Msgs)
- Tools Screen: mention nearby nodes and auto-advert in the highlight
- Promote Screenshot Tool to its own top-level section (was buried under
  Contributing); fix `uv run tools/screenshot.py` invocation path

Docs:
- favourites_dial: document the 3rd pin-picker tier (all chat contacts
  fallback) added in 0e0e5b93
- clock_screen: Altitude source clarified — onboard sensor (GPS or
  barometric), not always GPS
- message_screen: blank lines around image tables that were inlined

Code:
- UITask.cpp: rename leftover plus_y/plus_label locals to solo_y/solo_label
  in the splash-screen Solo banner

Workflow:
- workflow_dispatch builds previously labelled firmware with the branch
  name (GITHUB_REF_NAME). Resolve BUILD_VERSION to the tag when run on a
  tag push, else dev-<short-sha> so manual runs produce
  solo-dev-abc1234-oled.uf2 etc.

Cleanup:
- remove stray docs/solo_features/settings_screen/set_scr_1_eink copy.png

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.github/workflows/build-wio-tracker-l1-firmwares.yml

@@ -24,16 +24,21 @@ jobs:
       - name: Setup Build Environment
         uses: ./.github/actions/setup-build-environment
 
-      - name: Extract Version from Git Tag
-        run: echo "GIT_TAG_VERSION=${GITHUB_REF_NAME}" >> $GITHUB_ENV
+      - name: Resolve build version
+        run: |
+          if [ "$GITHUB_REF_TYPE" = "tag" ]; then
+            echo "BUILD_VERSION=${GITHUB_REF_NAME}" >> $GITHUB_ENV
+          else
+            echo "BUILD_VERSION=dev-$(git rev-parse --short HEAD)" >> $GITHUB_ENV
+          fi
 
       - name: Build Dual OLED Firmware
         env:
-          FIRMWARE_VERSION: ${{ env.GIT_TAG_VERSION }}
+          FIRMWARE_VERSION: ${{ env.BUILD_VERSION }}
         run: /usr/bin/env bash build.sh build-firmware WioTrackerL1_companion_dual
 
       - name: Rename OLED firmware
-        run: mv out/*.uf2 "out/solo-${{ env.GIT_TAG_VERSION }}-oled.uf2" 2>/dev/null || true
+        run: mv out/*.uf2 "out/solo-${{ env.BUILD_VERSION }}-oled.uf2" 2>/dev/null || true
 
       - name: Upload OLED Firmware
         uses: actions/upload-artifact@v4
@@ -51,16 +56,21 @@ jobs:
       - name: Setup Build Environment
         uses: ./.github/actions/setup-build-environment
 
-      - name: Extract Version from Git Tag
-        run: echo "GIT_TAG_VERSION=${GITHUB_REF_NAME}" >> $GITHUB_ENV
+      - name: Resolve build version
+        run: |
+          if [ "$GITHUB_REF_TYPE" = "tag" ]; then
+            echo "BUILD_VERSION=${GITHUB_REF_NAME}" >> $GITHUB_ENV
+          else
+            echo "BUILD_VERSION=dev-$(git rev-parse --short HEAD)" >> $GITHUB_ENV
+          fi
 
       - name: Build Dual E-ink Firmware
         env:
-          FIRMWARE_VERSION: ${{ env.GIT_TAG_VERSION }}
+          FIRMWARE_VERSION: ${{ env.BUILD_VERSION }}
         run: /usr/bin/env bash build.sh build-firmware WioTrackerL1Eink_companion_dual
 
       - name: Rename E-ink firmware
-        run: mv out/*.uf2 "out/solo-${{ env.GIT_TAG_VERSION }}-eink.uf2" 2>/dev/null || true
+        run: mv out/*.uf2 "out/solo-${{ env.BUILD_VERSION }}-eink.uf2" 2>/dev/null || true
 
       - name: Upload E-ink Firmware
         uses: actions/upload-artifact@v4