fix(cli): catch output directory creation errors in render

[miguel-heygen]

PR Stack

#	PR	Status
1	#122 — fix: info width/height swap	← base
2	#123 — fix: include all 9 templates in build
3	#124 — fix: suppress ANSI in non-TTY
4	#125 — fix: lint --json error paths
5	#126 — fix: separate info/warning counts
6	#127 — fix: lint severity display
7	#128 — fix: render output path error
8	#129 — fix: zero-duration error message	← top

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Summary

• mkdirSync for the render output path was not wrapped in try-catch
• When the path was invalid or permissions were denied, Node.js threw a raw EACCES error with full stack trace
• Now catches the error and displays a clean error box via the existing errorBox helper

Reproducer

npx hyperframes render --output /root/nope/output.mp4
# Was: raw "Error: EACCES: permission denied, mkdir '/root/nope'"
#   at Object.mkdirSync (node:fs:1379:3)
#   at ...12 lines of stack trace...
# Now: "Cannot create output directory: /root/nope — permission denied"

Stack

7/8 — Depends on #127

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