Add branded POTA activation sharing on Android

[patrickrb]

Adds Share activation buttons to completed entries in POTA history and their detail screens. Users preview a branded map/contact summary, publish its public data, and share a PNG through Android's share sheet. The QR opens the matching server-rendered HTML/CSS website summary, with an SVG map and the full contact log. Public pages are indexable; the preview disclosure makes this clear.

• Use FT8AF's navy, amber, cyan, Geist fonts, and existing icon/wordmark.
• Bundle the website renderer for an offline preview in a network-isolated WebView; external content cannot access the native bridge.
• Publish only explicitly allowed activation fields, use historical grids, and exclude notes and account credentials.
• Generate a 1080 × 1350 PNG with map paths, statistics, 12 contacts, remaining count, and QR. Share via FileProvider with temporary read permission.
• Translate native share labels and errors across the existing locales.

Companion website/API: patrickrb/ft8af-site#22

Validation: Kotlin compilation and three PotaSharePayloadTest tests passed on the final branch. The shared renderer sample was inspected and its QR decoded. Full Android lint reports existing project errors; no remaining findings reference the new sharing code or strings.

Release dependency: configure Neon DATABASE_URL, run the website migration, and deploy the companion API first. Real-device share-sheet, offline retry, and cross-device QR checks remain outstanding. The new summary interface is currently English.

[codecov]

Codecov Report

❌ Patch coverage is 11.46497% with 139 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.15%. Comparing base (365d2b5) to head (e82c84a).

Files with missing lines	Patch %	Lines
...in/radio/ks3ckc/ft8af/ui/pota/PotaShareActivity.kt	0.00%	127 Missing ⚠️
...in/kotlin/radio/ks3ckc/ft8af/ui/pota/PotaScreen.kt	0.00%	8 Missing ⚠️
...lin/radio/ks3ckc/ft8af/ui/pota/PotaSharePayload.kt	81.81%	0 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev     #802      +/-   ##
============================================
- Coverage     42.30%   42.15%   -0.16%     
  Complexity      228      228              
============================================
  Files           268      270       +2     
  Lines         32100    32257     +157     
  Branches       3705     3734      +29     
============================================
+ Hits          13581    13599      +18     
- Misses        18247    18382     +135     
- Partials        272      276       +4     

Flag	Coverage Δ
android	17.17% <11.46%> (-0.06%)	⬇️
native	9.93% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...lin/radio/ks3ckc/ft8af/ui/pota/PotaSharePayload.kt	81.81% <81.81%> (ø)
...in/kotlin/radio/ks3ckc/ft8af/ui/pota/PotaScreen.kt	6.83% <0.00%> (-0.08%)	⬇️
...in/radio/ks3ckc/ft8af/ui/pota/PotaShareActivity.kt	0.00% <0.00%> (ø)

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