fix(tui): keep the xhigh effort color distinct from periwinkle plan mode

[elkaix]

Requirement or Bug

Keep the xhigh effort border distinct from plan mode after #369 made the primary color periwinkle.

Bug Reproduction Steps

On main, pick xhigh effort with Shift-Tab, then turn on /plan. The prompt border is #A78BFA (xhigh) in one case and #B4B8F8 (plan, periwinkle primary) in the other. The two shades are hard to tell apart.

Root Cause

#369 changed primary, and modePlan with it, to periwinkle #B4B8F8. That moved the plan color close to the existing effortXHigh violet. This is a palette fix, not a workaround.

Code Changes

effortXHigh changes from #A78BFA to #D58BF0 (dark) and from #7048B6 to #8E3AA8 (light). The docs table and the unreleased periwinkle changeset are updated. Contrast: light xhigh on white is 6.32:1, dark xhigh on black is 8.78:1.

Behavior Changes and Affected Users

Behavior	Before	After	Who relies on the old behavior	Escape hatch
Prompt border at xhigh effort	#A78BFA / #7048B6	#D58BF0 / #8E3AA8	none (visual only)	custom theme effortXHigh

Affected module: apps/pythinker-code/src/tui/theme/colors.ts. TUI tests: 2896 passed.

Checklist

• I have read the CONTRIBUTING document.
• I have linked a related issue (external PRs: issue must have a maintainer's /approve).
• I have added tests that prove my feature works. (palette value change; existing contrast tests cover it)
• The behavior-change table above is complete, and every removed behavior or flipped default is named in the changeset and either has an escape hatch or was explicitly approved by a maintainer in this PR.
• Ran gen-changesets skill, or this PR needs no changeset.
• Ran gen-docs skill, or this PR needs no doc update.

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📥 Commits

Reviewing files that changed from the base of the PR and between 359f143 and 1093874.

📒 Files selected for processing (3)

• .changeset/periwinkle-primary.md
• apps/pythinker-code/src/tui/theme/colors.ts
• docs/customization/themes.md

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commit: 1093874