fix: remove automatic third-party egress of user data + optional strict offline mode (OSM tiles, Scalar fonts, editor fonts, AI model downloads) (#422)

* fix: remove all automatic third-party egress (OSM tiles, Scalar fonts, editor Google Fonts, AI model download fallbacks)

Phone-home audit follow-up. The product no longer makes any automatic
third-party request; user-initiated click-outs stay, and production now
fails closed on missing AI models.

1. GPS leak via OSM tiles: the strip-metadata panel auto-loaded
   tile.openstreetmap.org tiles encoding the photo's GPS position. The
   Leaflet mini-map is gone; coordinates render as text plus an explicit
   View on map link (openstreetmap.org, opens on click only). Removed
   tile.openstreetmap.org from the CSP img-src, dropped the leaflet
   dependency, added the viewOnMap i18n key to all 21 locales.

2. Scalar docs fonts: /api/docs loaded Inter and JetBrains Mono from
   fonts.scalar.com. Scalar now renders with withDefaultFonts: false and
   both --scalar-font and --scalar-font-code pinned to system stacks;
   fonts.scalar.com removed from the docs CSP font-src. Verified by
   injecting GET /api/docs/: config carries withDefaultFonts false and
   the served page has no fonts.scalar.com reference.

3. Editor Google Fonts: the editor font picker built
   fonts.googleapis.com stylesheet URLs for 25 web fonts the served CSP
   already blocked. The remote loading path is deleted; the picker now
   offers system fonts only, with a SELF_HOSTED_FONTS seam (FontFace API,
   same origin) for bundling fonts later. Unknown families saved in old
   documents fall back to the browser default.

4. Python sidecar fails closed on model downloads: new
   packages/ai/python/offline_guard.py gates every runtime download
   fallback (inpaint, outpaint, restore, noise_removal, detect_faces,
   enhance_faces, face_landmarks, red_eye_removal, remove_bg, ocr,
   transcribe, upscale) behind SNAPOTTER_ALLOW_MODEL_DOWNLOAD=1 with an
   actionable error. Bundled models keep working untouched.

5. OCR and transcription library-internal downloads: unbundled PaddleOCR
   language and detection fallbacks now raise the guard error naming the
   language instead of resolving models over the network; faster-whisper
   gets local_files_only when downloads are off.

6. GFPGAN and CodeFormer cwd-relative weights: facexlib and
   codeformer-pip resolve helper weights relative to the process cwd and
   fetch them from GitHub when absent. They are now symlinked from the
   installed bundle files under MODELS_PATH/gfpgan/facelib before the
   libraries load, failing closed when unresolvable.

Defense in depth: HF_HUB_OFFLINE=1 and TRANSFORMERS_OFFLINE=1 are set in
the runtime image and in the sidecar spawn env; install_feature.py lifts
them for user-initiated bundle installs and restores them afterwards
(it can run in-process inside the dispatcher). SNAPOTTER_ALLOW_MODEL_DOWNLOAD
is documented in .env.example, default off.

Validation: typecheck 9/9 workspaces, Biome clean on touched files,
5178 unit tests pass, py_compile on all touched scripts, guard behavior
exercised in both dispatcher exec and per-request import modes, zero
remaining runtime references to the three hosts. Docker build and live
AI inference need post-merge verification on the GPU host.

Claude-Session: https://claude.ai/code/session_01XGB4pGvTvb7sUX4JN745U7

* fix: allow AI model downloads by default, make strict offline mode opt-in

Product call: ease of use first. The download gating from the previous
commit inverts its default: runtime model fetches (public model weights
only, never user data) are allowed out of the box so AI tools self-heal,
and SNAPOTTER_ALLOW_MODEL_DOWNLOAD=0 becomes the explicit strict offline
mode for airgapped deployments, where every fallback raises the
actionable error instead of fetching.

Changes: offline_guard blocks only on an explicit 0/false; the
unconditional HF_HUB_OFFLINE/TRANSFORMERS_OFFLINE image ENV is removed
and bridge.ts sets those flags for the sidecar only in strict mode;
.env.example documents the new default; install_feature's lift/restore
stays. All bundled-path preferences, pre-existence checks, and symlink
pre-placement remain, so installed bundles never trigger a download.
The OSM, Scalar font, and editor font fixes are unchanged.

Validation rerun: typecheck 9/9, Biome clean on touched files, 5178
unit tests pass, py_compile on touched scripts, guard behavior verified
for unset/1 (allowed) and 0/false (blocked with the new message).

Claude-Session: https://claude.ai/code/session_01XGB4pGvTvb7sUX4JN745U7

pnpm-lock.yaml

@@ -481,9 +481,6 @@ importers:
       konva:
         specifier: ^10
         version: 10.3.0
-      leaflet:
-        specifier: ^1.9.4
-        version: 1.9.4
       lucide-react:
         specifier: ^0.577.0
         version: 0.577.0(react@19.2.7)
@@ -542,9 +539,6 @@ importers:
       '@tailwindcss/vite':
         specifier: ^4.3.1
         version: 4.3.1(vite@8.0.16(@types/node@26.0.0)(esbuild@0.28.1)(jiti@2.7.0)(terser@5.47.1)(tsx@4.22.4)(yaml@2.9.0))
-      '@types/leaflet':
-        specifier: ^1.9.21
-        version: 1.9.21
       '@types/react':
         specifier: ^19.2.17
         version: 19.2.17
@@ -3622,18 +3616,12 @@ packages:
   '@types/estree@1.0.9':
     resolution: {integrity: sha512-GhdPgy1el4/ImP05X05Uw4cw2/M93BCUmnEvWZNStlCzEKME4Fkk+YpoA5OiHNQmoS7Cafb8Xa3Pya8m1Qrzeg==}
 
-  '@types/geojson@7946.0.16':
-    resolution: {integrity: sha512-6C8nqWur3j98U6+lXDfTUWIfgvZU+EumvpHKcYjujKH7woYyLj2sUmff0tRhrqM7BohUw7Pz3ZB1jj2gW9Fvmg==}
-
   '@types/hast@3.0.4':
     resolution: {integrity: sha512-WPs+bbQw5aCj+x6laNGWLH3wviHtoCv/P3+otBhbOhJgG8qtpdAMlTCxLtsTWA7LH1Oh/bFCHsBn0TPS5m30EQ==}
 
   '@types/js-yaml@4.0.9':
     resolution: {integrity: sha512-k4MGaQl5TGo/iipqb2UDG2UwjXziSWkh0uysQelTlJpX1qGlpUZYm8PnO4DxG1qBomtJUdYJ6qR6xdIah10JLg==}
 
-  '@types/leaflet@1.9.21':
-    resolution: {integrity: sha512-TbAd9DaPGSnzp6QvtYngntMZgcRk+igFELwR2N99XZn7RXUdKgsXMR+28bUO0rPsWp8MIu/f47luLIQuSLYv/w==}
-
   '@types/linkify-it@5.0.0':
     resolution: {integrity: sha512-sVDA58zAw4eWAffKOaQH5/5j3XeayukzDk+ewSsnv3p4yJEZHCCzMDiZM8e0OUrRvmpGZ85jf4yDHkHsgBNr9Q==}
 
@@ -5805,9 +5793,6 @@ packages:
     resolution: {integrity: sha512-b94GiNHQNy6JNTrt5w6zNyffMrNkXZb3KTkCZJb2V1xaEGCk093vkZ2jk3tpaeP33/OiXC+WvK9AxUebnf5nbw==}
     engines: {node: '>= 0.6.3'}
 
-  leaflet@1.9.4:
-    resolution: {integrity: sha512-nxS1ynzJOmOlHp+iL3FyWqK89GtNL8U8rvlMOsQdTTssxZwCXh8N2NB3GDQOL+YR3XnWyZAxwQixURb+FA74PA==}
-
   leven@4.1.0:
     resolution: {integrity: sha512-KZ9W9nWDT7rF7Dazg8xyLHGLrmpgq2nVNFUckhqdW3szVP6YhCpp/RAnpmVExA9JvrMynjwSLVrEj3AepHR6ew==}
     engines: {node: ^12.20.0 || ^14.13.1 || >=16.0.0}
@@ -12084,18 +12069,12 @@ snapshots:
 
   '@types/estree@1.0.9': {}
 
-  '@types/geojson@7946.0.16': {}
-
   '@types/hast@3.0.4':
     dependencies:
       '@types/unist': 3.0.3
 
   '@types/js-yaml@4.0.9': {}
 
-  '@types/leaflet@1.9.21':
-    dependencies:
-      '@types/geojson': 7946.0.16
-
   '@types/linkify-it@5.0.0': {}
 
   '@types/markdown-it@14.1.2':
@@ -14439,8 +14418,6 @@ snapshots:
     dependencies:
       readable-stream: 2.3.8
 
-  leaflet@1.9.4: {}
-
   leven@4.1.0: {}
 
   lie@3.3.0: