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Adds a fourth opt-in setting to the banner customization surface. The info panel renders four rows (title, subtitle/spacer, status, path); the second row was a hard-coded single-space spacer up to now. With this change a fork or white-label deployment can set `ui.customBannerSubtitle` to a one-line subtitle (e.g. "Built-in DataWorks Official Skills") and have it render in the secondary text color in place of the spacer. Empty/unset preserves the previous blank-spacer layout, so the change is back-compat. The subtitle is sanitized through the same `sanitizeSingleLine` helper as the title (now factored out): OSC / CSI / SS2 / SS3 leaders dropped, every other C0/C1 control byte replaced with a space, internal whitespace collapsed, ends trimmed. Capped at 160 characters — looser than the title's 80 because tagline / "powered by" copy commonly runs longer — with the same `[BANNER]` warn on truncation. Wiring: - `settingsSchema.ts` — new `customBannerSubtitle` entry next to `customBannerTitle`, `showInDialog: false` (free-form text in the TUI dialog isn't worth its own picker). - `customBanner.ts` — `ResolvedBanner.subtitle` field; `resolveCustomBanner` populates it; `sanitizeTitle` and the new `sanitizeSubtitle` share the same helper. - `Header.tsx` — when `customBannerSubtitle` is truthy the spacer row renders the string (secondary color, single line) instead of `<Text> </Text>`. Auth/model and path still sit at their usual positions. - `AppHeader.tsx` — pipes `resolvedBanner.subtitle` through. - VSCode JSON schema regenerated from source (idempotent). Tests: 5 new resolver tests (default, sanitize, length cap, empty, newline + C1 strip), 2 new Header tests (renders subtitle between title and auth; spacer preserved when unset), 1 new AppHeader integration test (end-to-end through resolver). Banner suite is now 35 + 17 + 6 + 16 = 74 tests, all green. Design docs (EN + zh-CN) updated: region taxonomy now lists four B-rows; "Limits at a glance" table grows a subtitle row; "Customization rules" matrix and "How to modify" section gain a "Add a brand subtitle" example with a rendered four-row preview. |
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