Add Polk MagnifiMini Remote app

[varunyellina]

IR remote for the Polk MagnifiMini soundbar. Initial release featuring a custom grid UI with press-feedback inversion and a submenu for source/EQ selection.

Features:

• Power, Mute, Night mode
• Volume Up / Down
• Playback controls (Previous, Play/Pause, Next)
• Voice level and Bass level adjustment
• Source selection: AUX, Optical, HDMI ARC
• EQ Preset selection: Cinema, Sports, Music

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Extra Requirements

Requires a Polk MagnifiMini soundbar. No extra hardware or software beyond the Flipper Zero itself. The bundled .ir file can also be used directly with the Flipper's built-in IR app.

Author Checklist (Fill this out)

• I've read the contribution guidelines and my PR follows them
• I own the code I'm submitting or have code owner's permission to submit it
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have validated the manifest file(s) with python3 tools/bundle.py --nolint applications/CATEGORY/APPID/manifest.yml bundle.zip

AI usage disclosure (Fill this out):

• Fully AI generated (explain what all the generated code does in moderate detail).

• The UI rendering logic (scene_main.c, scene_submenu.c) and IR command dispatch (polk_remote.c) were developed with AI assistance. The AI helped implement the custom grid view, press-inversion feedback, scroll behaviour, and submenu navigation. IR signal values were captured independently from the physical remote using the Flipper's built-in IR receiver.

Reviewer Checklist (Don't fill this out!)

• Bundle is valid
• There are no obvious issues with the source code
• I've ran this application and verified its functionality

[xMasterX]

App works fine, thanks!