Map six more SF Symbols to Material icons

[Ceylo]

What

On Android, Image(systemName:) draws Icons.Default.Warning for bubble, message, safari, exclamationmark.bubble, square.and.arrow.down and ellipsis.bubble, and logs "Unable to find system image". This PR maps each one to the outlined Material icon closest in shape. They all come from material-icons-extended, which SkipUI already depends on. Same shape as #476: entries in composeSymbolName(for:) and composeImageVector(named:), plus the glyph comment.

SF Symbol	Material icon	iOS 26.5	before	after
bubble	Icons.Outlined.ChatBubbleOutline
message	Icons.Outlined.Chat
safari	Icons.Outlined.Explore
exclamationmark.bubble	Icons.Outlined.Feedback
square.and.arrow.down	Icons.Outlined.SaveAlt
ellipsis.bubble	Icons.Outlined.Sms

The icons were picked by shape, not by meaning, as #200 asks. Two are approximate. Material has no oval bubble, so message gets Chat: its lines keep it distinct from bubble. SaveAlt was chosen over FileDownload because its tray has sides, like the SF box.

Before / after

Showcase → Symbol. The six rows are added to the playground by skiptools/skipapp-showcase#123. Rows cropped from Fuse screenshots; Lite is pixel-identical.

iOS 26.5	before	after

Side effects

• Only the six new rows change. In both Lite and Fuse, every other row of the Symbol playground was captured before and after: 74 rows, including the existing symbols, the .foregroundStyle/.tint/.font rows and the Symbol Variants section. All are pixel-identical. The first and last rows of the page were not captured by the script.
• Filled variants are not mapped. bubble.fill, message.fill, etc. still fall back to the warning triangle, as the other outlined-only entries do today.
• Apple platforms: none. The mapping lives in the #if SKIP block.

Verified

• swift test: 93 Swift tests, 36 skipped, 0 failures. JUnit: 92 tests, 87 passed, 5 skipped, 0 failed.
• Showcase built through Gradle with this branch as its skip-ui (SKIP_DEPENDENCY_ROOT), in Lite and Fuse, and run on an API 37 Android emulator, before (skip-ui main) and after. Also run on an iPhone 17 simulator (iOS 26.5) as the reference.
• Each new icon checked by eye on a zoomed crop to be an outline, not a filled glyph (the Fallback symbol star maps to Icons.Outlined.Star which, despite the name, is not outlined #148 trap).
• Glyph comments: the codepoint was found by matching each symbol's rendered image against the SF Pro font's glyphs. The same match finds the existing comments for square.and.arrow.up, hand.thumbsup and trash.

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Skip Pull Request Checklist:

• REQUIRED: I have signed the Contributor Agreement
• REQUIRED: I have tested my change locally with swift test
• OPTIONAL: I have tested my change on an iOS simulator or device
• OPTIONAL: I have tested my change on an Android emulator or device
• REQUIRED: I have checked whether this change requires a corresponding update in the Skip Fuse UI repository (link related PR if applicable). No API change, so no paired PR.
• OPTIONAL: I have added an example of any UI changes to the Showcase sample app: Add the newly mapped symbols to SymbolPlayground skipapp-showcase#123

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• AI was used to generate or assist with generating this PR. Please specify below how you used AI to help you, and what steps you have taken to manually verify the changes.

Written with Claude Code: the mapping and the playground rows. Every claim above comes from a run: the Showcase on an emulator (Lite and Fuse) before and after, with a per-row pixel comparison of the whole playground, and on a simulator for the SF originals.