Add overlay templates, improve camera preview, gallery selection, and locations UI

[krishna3554]

Motivation

• Introduce configurable overlay templates for saved images and on-screen previews so users can choose different metadata card styles (classic_dark, minimal_strip, field_report).
• Improve camera preview scaling and provide a template picker in-camera for faster template selection.
• Enhance gallery and locations experiences with selection, sharing/deleting multiple photos, date grouping, improved viewer, and a map view for location entries.

Description

• Add OverlayTemplateIds and new overlayTemplate setting to AppSettings and persist it via SettingsService (overlayTemplateKey).
• Rework LocationStampCard to support multiple templates and compact previews, accept settings injection, and expose _StaticMap with configurable size and label rendering.
• Update ImageOverlayService.composeGeoTaggedImage to accept overlayTemplate and render three templates by adding _drawMinimalStrip and _drawFieldReportCard (and adjust layout, fonts, colors for rendering).
• Update camera UI in camera_screen.dart: replace CameraPreview with _CameraPreviewCover for correct aspect fitting, pass settings into LocationStampCard, and add a _TemplateChoiceTile sheet to select and save templates.
• Upgrade gallery in gallery_screen.dart: add date grouping (uses intl), selection mode (_selectedIds) with multi-share and multi-delete, a paged AppPhotoViewer, tile components (_GalleryTile, _DateHeader), and an empty-state widget (_EmptyGallery).
• Implement locations UI in locations_screen.dart: load and group photo locations into _LocationEntry, add search header, entries grouped by capture date, expandable cards with thumbnails, actions sheet (view, map, share, delete), and a _LocationsMap using flutter_map for map overview.
• Miscellaneous tweaks: increase static map request size, refine loading placeholders, style and layout adjustments across templates, and a number of small refactors to frame builders and image caching in thumbnails.

Testing

• Ran static analysis with flutter analyze which completed without issues.
• Ran the automated test suite with flutter test and all tests passed.

---

Codex Task

[chatgpt-codex-connector]

💡 Codex Review

GPS_Camera/lib/services/image_overlay_service.dart

Line 220 in 7ad4a84

final cardTop = height - cardHeight - (height * 0.035).round();

Keep the watermark visible on field report exports

When users choose the new field_report template, this places the card from about 68.5% to 96.5% of the image height, but _drawWatermark is drawn earlier at about 70% of the height. Because _drawFieldReportCard is painted after the watermark, the field-report card covers the watermark on exported photos, unlike the classic/minimal templates.

---

GPS_Camera/lib/features/camera/screen/camera_screen.dart

Lines 607 to 610 in 7ad4a84

	const Text(
	'Overlay Templates',
	style: TextStyle(fontSize: 20, fontWeight: FontWeight.w800),
	),

Set light text colors in the dark template sheet

When the app is in light theme (darkTheme=false), this modal still forces a dark background but these Text widgets inherit the light theme's dark/default text color, so the sheet title and template names render nearly unreadable on the black sheet. Give the sheet's text a light DefaultTextStyle or explicit white colors.

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".