Gate compile options by Less version

[matthew-dean]

What

The Options panel is now rendered from src/options.ts (supportedOptions(version)), and updateVue() sends only renderOptions(store, version) to less.render — nothing invalid or misnamed for the active version.

Option	Control	Versions	Evidence
strictMath	switch	< 3.7.0	replaced by math in less.js 76c10345 (first tag v3.7.0)
math	select always / parens-division / parens	>= 3.7.0	same commit
strictUnits	switch	< 5.0.0	5.x treats it as a deprecated alias of unitMode (packages/less/lib/options.js on alpha, 7ed6ec4e)
unitMode	select loose / strict / preserve	>= 5.0.0	same
collapseNesting	switch, off by default	>= 5.0.0	5.0.0-alpha.1 7d07c112
compress	switch "Minify output (deprecated)"	< 5.0.0	rejected by 5.x unsupportedAlphaOptions

Prereleases compare by numeric core (5.0.0-alpha.2 → 5.0.0). Controls show/hide reactively on version change; the existing store watch re-renders. The store still holds every key, so the URL hash format is unchanged.

Verified

pnpm build green. In the dev server, wrapping less.render to log the options object:

• 4.9.1 → Math mode, Strict units, Minify; sends { math, strictUnits, compress }
• 3.6.0 → Strict math switch instead of Math; sends { strictMath, strictUnits, compress }; compiles
• 5.0.0-alpha.2 (experimental) → Math mode, Unit mode, Collapse nesting; sends { math, unitMode, collapseNesting } (control visibility + option object only — that alpha's bundle 404s, so no live 5.x compile)
• back to 4.9.1 → { math, strictUnits, compress }, no collapseNesting/unitMode

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📥 Commits

Reviewing files that changed from the base of the PR and between e7a529f and e8f4a84.

📒 Files selected for processing (2)

• src/App.vue
• src/options.ts

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