feat(web): add safe channel share workflow

[RCGV1]

Closes #1313
Design: meshtastic/design#128

Summary

• Add a strict, reusable channel-share URL encoder/parser for canonical URLs and the documented legacy Add marker.
• Make Replace the default in both QR sharing and pasted-link intake; Add links contain no LoRa configuration and lock intake to Add.
• Plan imports before writing: Add preserves existing channels and LoRa settings, and blocks duplicate names or insufficient secondary-slot capacity.
• Make Replace complete by staging disabled records for every secondary slot not in the incoming set.
• Commit channel and LoRa changes through the SDK editor's single edit transaction; failed commits keep the import open and surface an error toast.
• Block import while the shared configuration editor has pending settings changes, so a channel import cannot commit unrelated radio, module, channel, or owner edits.
• Align share and intake terminology, add copy and Web Share fallback, and leave reconnect/reboot behavior event-driven and unchanged.

Validation

• vitest run src/core/utils/channelShare.test.ts (12 passing fixtures, including dirty-editor commit prevention)
• oxfmt --check and oxlint on touched TypeScript files
• vite build completed; this isolated checkout emits a non-fatal missing-tag warning from the existing version step and the existing chunk-size warning.
• Full tsc --noEmit remains blocked by pre-existing SDK/type mismatches outside this change; it produced no diagnostics in touched files.

Verification pending

• No connected-node hardware import/share session was available.
• No browser visual pass was captured; this remains a draft for that follow-up.

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Project	Deployment	Actions	Updated (UTC)
web-test	Ready	Preview, Comment	Jul 19, 2026 7:25pm