[BUILD] - exif-stripper Implementation

[github-actions]

This is a new implementation run — no prior implementation existed.

Features Implemented

US1 — Strip & Download (P1 MVP)

• Drag-and-drop or file picker for JPEG and PNG images (single or batch)
• Full EXIF metadata table with human-readable labels for ~80 standard tags
• GPS coordinates displayed as a clickable Google Maps link
• Prominent GPS warning banner with a "Remove GPS Only" one-click shortcut
• "Strip All & Download" — JPEG uses a lossless binary splice (DataView walk, zero pixel re-encoding, zero quality loss); PNG uses Canvas re-encode
• "Clear / Reset" returns the UI to the initial drop state

US2 — Selective Strip (P2)

• Field group checkboxes: Location / GPS, Device Info, Timestamps, Camera Settings
• "All" master checkbox with per-group override logic
• "Strip Selected & Download" removes only the checked groups
• "Remove GPS Only" shortcut in the GPS warning banner pre-selects Location group and downloads immediately

US3 — Batch Strip (P3)

• Load up to 10 images simultaneously
• Per-file summary list showing filename, GPS badge, EXIF tag count, and processing status
• Click any file in the batch list to view its full metadata in the detail panel
• "Strip All & Download as ZIP" packages all stripped images using JSZip
• Per-file progress bar during batch processing

Vendored Dependencies

• JSZip 3.10.1 added to package.json, scripts/sync-vendor.mjs, and committed to tools/vendor/jszip/jszip.min.js
• tools/vendor/manifest.json updated to include JSZip entry
• All other existing vendor assets (pdfjs, pdf-lib, jspdf, ffmpeg, qrcode) are reused unchanged

Shared Assets Reused

• tools/common.css — layout, buttons, drop zone, badges, error states
• tools/template.html — used as structural reference

Structured Data

exif-stripper.html includes:

• SoftwareApplication schema with feature list
• HowTo schema with 3 steps matching the tool workflow

How to Run

Open tools/exif-stripper.html in a browser (or serve from the repo root with npm run serve:tools).

Closes #38

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