Redesign Fiordland theme — refine dark teal-blue identity

[gregpriday]

Summary

The Fiordland theme is a deep blue-black dark theme inspired by New Zealand's fjords. The bones are good but several token choices undermine the theme's potential: the surface hierarchy is thin, the terminal palette borrows Tokyo Night colors without adapting them to Fiordland's cooler, more muted character, and the accent green feels disconnected from the slate-blue surface.

Problem Statement

Fiordland uses very dark blue-black surfaces (#070D12 canvas, #0A1520 sidebar) with cold blue overtones. The overall feel is close to correct — dark, cold, deep water — but it has some rough edges:

• Surface differentiation is weak: canvas #070D12 and sidebar #0A1520 are separated by only a few luminance steps, making the sidebar barely read as distinct.
• border-default (#1A2B38) has enough blue in it to read as a UI element rather than a receding separator — it draws too much attention.
• The terminal colors (terminal-red: #F7768E, terminal-green: #9ECE6A, etc.) are visually lifted from Tokyo Night. On the Fiordland surface they're bright and slightly incongruous — the theme's own surface palette is much more restrained.
• terminal-bright-red is set to #FF9E64 — an orange, not a bright red. This semantic mismatch is confusing in terminal output.
• syntax-keyword: #E86A33 is a warm orange, the hottest color in the palette, and it contrasts sharply with the cold surface in a way that feels accidental rather than intentional.
• The activity indicators use Daintree's defaults (activity-active: #22c55e, activity-waiting: #fbbf24) — both work but could better integrate with the fjord's cold blue-grey character.

Relevant code:

• shared/theme/themes.ts#L319-L386 — current Fiordland token definitions
• shared/theme/terminal.ts — terminal scrollbar derivation from activity-idle

Desired Behavior

Fiordland should evoke deep fjord waters and granite cliffs: cold, dark, with a clear blue-teal mid-tone palette. Refinements should:

• Strengthen sidebar-to-canvas separation so the sidebar clearly anchors the layout.
• Bring terminal colors into the theme's own vocabulary — cooler, more muted analogues of the standard ANSI palette that still meet legibility contrast.
• Use a more coherent syntax highlighting palette that feels at home on cold-blue surfaces rather than borrowed from a warmer theme.
• Optionally adapt activity-active to a cooler blue-green that fits the fjord character while still reading as "active/running."

Verification Workflow

1. Apply the theme: await setAppTheme(window, "fiordland").
2. Capture full-page screenshot.
3. Measure: sidebar vs. canvas, toolbar text, worktree card contrast.
4. AI visual evaluation: does the theme read as cold fjord? Is the terminal legible? Are syntax colors coherent with the surface?
5. Iterate; run npm run check.

Acceptance Criteria

• Sidebar and canvas have visually clear separation (contrast ratio ≥ 1.08 between the two surfaces).
• terminal-bright-red is a red variant, not orange — semantic correctness for terminal output.
• Terminal colors (normal and bright ANSI set) are legible against the Fiordland canvas background.
• The theme reads as a coherent cold blue-teal dark theme — cold, deep, minimal — when evaluated via screenshot.
• All existing E2E tests pass.

Edge Cases & Risks

• The explicitly-set overlay-* tokens in Fiordland (currently the only theme that overrides them) should be reviewed: they may need adjusting after surface changes.
• The paired terminal scheme from PR feat(terminal): match terminal color scheme to app theme automatically #3345 maps Fiordland to a specific terminal palette — verify the app/terminal pairing still looks cohesive after token changes.

[gregpriday]

Terminal color scheme — review as part of redesign

The APP_THEME_TERMINAL_SCHEME_MAP currently maps fiordland → dracula (Dracula). As part of this theme redesign, review whether the terminal color scheme still pairs well with the updated app surfaces:

1. Evaluate the current pairing — after updating the surface/accent tokens, check whether Dracula still feels cohesive. If the surface palette shifts significantly, the terminal may look disconnected.
2. Research alternatives — search for well-known open-source terminal color schemes whose character matches the redesigned theme. Evaluate candidates for ANSI color legibility against the new surface background, not just aesthetic similarity.
3. Consider a bespoke scheme — if no existing scheme is a tight fit, create a dedicated one derived from the redesigned app tokens (like we did for Daintree via getTerminalThemeFromAppScheme). This gives the tightest visual integration.
4. Adapt rather than copy — if borrowing an open-source palette, adjust selection background, cursor, and bright variants so they harmonize with the app's surface/accent tokens.

Update APP_THEME_TERMINAL_SCHEME_MAP in src/config/terminalColorSchemes.ts and add any new scheme to the BUILT_IN_SCHEMES array. Update the test count in src/config/__tests__/terminalColorSchemes.test.ts if adding a new scheme.