feat(url): percent-encode filename path segments in copied URLs

[erbanku]

Spaces and special characters in filenames were copied as-is into the clipboard URL instead of being percent-encoded, causing links to fail in some clients.

• Add percent_encode_segment and percent_encode_r2_key helpers in the Rust engine and apply them in build_public_url, fixing the root source that writes to history DB and powers notification actions
• Encode each r2Key path segment in QueueViewModel.copyURL and HistoryViewModel.resolveURL using urlPathAllowed, preserving / separators between segments
• Re-encode legacy unencoded stored URLs in the history fallback path via URLComponents for backward compatibility
• Add four new Rust unit tests covering spaces, parens, multi-segment paths, and unreserved character pass-through
• Fix pre-existing compile error in config.rs test (missing allow_anonymous_telemetry field)

Closes #2

[Copilot]

Pull request overview

This PR fixes URL generation/copying so filenames containing spaces and other characters are percent-encoded per-path-segment (without encoding / separators), improving link reliability across clients while keeping legacy history entries working.

Changes:

• Add RFC 3986 segment percent-encoding in the Rust engine’s build_public_url and expand unit test coverage.
• Encode r2Key path segments when copying URLs from Queue and resolving URLs from History, including a legacy-history fallback re-encode.
• Fix a Rust config test compile failure by adding the missing allow_anonymous_telemetry field.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
app/R2Drop/App/Queue/QueueViewModel.swift	Percent-encodes each r2Key path segment when copying public URLs.
app/R2Drop/App/History/HistoryViewModel.swift	Encodes r2Key segments for custom domains and re-encodes stored legacy URLs for backward compatibility.
app/engine/r2-core/src/runner.rs	Adds strict per-segment percent-encoding in build_public_url and new unit tests.
app/engine/r2-core/src/config.rs	Fixes test setup by including allow_anonymous_telemetry and minor formatting changes.

Comments suppressed due to low confidence (1)

app/R2Drop/App/Queue/QueueViewModel.swift:345

• base.hasPrefix("http") treats any custom domain starting with "http" (e.g. httpfiles.example.com) as already including a scheme, producing a schemeless URL. Check for http:// or https:// explicitly before omitting the default scheme.

        if let domain = account.customDomain, !domain.isEmpty {
            let base = domain.hasSuffix("/") ? String(domain.dropLast()) : domain
            let scheme = base.hasPrefix("http") ? "" : "https://"
            url = "\(scheme)\(base)/\(r2Key)"

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