Fix flash overflow in esp32-cyd-capacitive-ip5306-shutdown build

[booherbg]

pio run -e esp32-cyd-capacitive-ip5306-shutdown fails on current main:

Flash: [==========]  102.4% (used 1811173 bytes from 1769472 bytes)
Error: The program size (1811173 bytes) is greater than maximum allowed (1769472 bytes)

The shutdown countdown label is the only reference to lv_font_montserrat_48, which costs ~97KB of flash in this env alone. Build history of the env:

tag	app slot usage
v1.2.0	96.7%
v1.2.1	96.9%
v1.2.2	102.3% — first failure
v1.2.3	102.4%

v1.2.2 grew the app by ~96KB, which consumed the env's remaining headroom. CI only builds esp32-cyd, so the breakage was not visible there.

Fix: gate LV_FONT_MONTSERRAT_48 behind WLED_SCREEN_WIDTH >= 480 (same pattern already used for montserrat_24/28) and fall back to lv_font_montserrat_20 for the countdown on small screens.

Verified locally:

• esp32-cyd-capacitive-ip5306-shutdown: 102.4% → 96.9%
• esp32-cyd: unchanged size (1713705 bytes before and after; the font was already discarded by the linker as unreferenced in this env)
• jc8048w550c, jc4880p443, macos sim: build, big screens keep the 48px countdown font

Might be worth adding this env to the release workflow's build matrix so it can't regress silently again.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: e08356ef-4113-4c41-892a-ee252a9b9533

📥 Commits

Reviewing files that changed from the base of the PR and between e56eaf4 and 3e887b7.

📒 Files selected for processing (2)

• include/lv_conf.h
• src/ui/ui.cpp

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📝 Walkthrough

Walkthrough

The configuration now enables LV_FONT_MONTSERRAT_48 only on screens at least 480 pixels wide. The shutdown countdown uses the 48-point font when available and otherwise uses lv_font_montserrat_20.

Changes

Font selection

Layer / File(s)	Summary
Conditional font fallback include/lv_conf.h, src/ui/ui.cpp	LV_FONT_MONTSERRAT_48 is disabled below 480 pixels to reduce firmware size. The shutdown countdown selects the 20-point fallback when the 48-point font is unavailable.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 3e887

This change removes an unnecessary large font from the affected small-screen build while preserving the larger font where needed; no actionable merge-blocking risk remains beyond normal checks and review.

Suggested reviewers: figamore

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the primary change: fixing flash overflow in the affected build.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[booherbg]

Superseded by #2.